pig. I. 2am'oArhrviv rrrefrrfrenslr sp. Boy. Secdon 6 g of specimen S.556,'1 (nor inc)udcd in text-hg, 12) enlarged to show the development cf the crural base tvith secondary clubbing. The primary binge pilate has a cuneate relationship 'Io the crural'bass. Frg. 2. Lrrl'iofirfryrtr Nefnirenstssp. nov. gecrion 48 of text hg. 12 photographed to shorn the Internal structure of the cardinal process, esprx'.tat)y the distribution of'punctaie and impuncrare skeletal tissue, The juvenge prinr sry h Luge plates have a secxIndarv clubbed thickening mhreh mas deposited prior to the incorporation of the hinge plates hrto the cardinal process. Fig. 3..Lurirrlirhyria mdairerrsis sp. nov. Section 6 2 of text-hg, 12 enlarged to show the primary hinge plate surroundled by secondary tissue and the first sign of devek pmem of the crural base within rbe piped inner margin of the bin~ plate. Fig. 4. Lrrri o@tfrpeis rurxil/ertris (dc Loriol). Section 4 6 of text-lig, 7 enlarged ro show the so ncl u re of the pifax)

inner margin of the hinge plate. Pig. 5..Prrrc5oubelrhyrtr p)irvregcn. Ct sp nov. Part ol'section 4 8 ol'test frg. 16 enlarged Io shorn the structure

of tive comrced rrrnef margin of Ihe hinge plate. Linear scale = 2 mm.

PLATE 61 MIDBLSMISS, Cretaceous Tcrebratuhdae

PALAEONTOLOOY voLUME xs

Seflfthyriz crrrreraIrima (d'Orbigny) is recorded by Koch from the Berriasiart and thc Barremian, by Gigout from the Valangin)an (of gafr) and by Ambroggi from the Hauterivian. ln the Gentil COI)+<ion there is one specimen from Tinirt Ait Amenr (probably Hauterivian) which has acme reaemblanCC 'tc S. err''ICFOrrirxrsrx In berng ObeSCr equidimensional, and Strcnglv CprsuleaIC but Ihe resemb)ance ts closer' rn fact to thc AIacrlan varxety or subspccrcs of 5 se)far (scc below), Thc saxrxc can be said of Gigout's figuxcd specimen (Gigout 195), pl. 9. frgs. 11-14). S. Crrrterorrfxatrr iS an rntercstrng specres front thc palaeobrogcOgraphlcal pclni of vrcw as (rr) rt is a CharacieriSIIC mcrnber ol the Jura fauna which isa)so found in north Germany during the time of the Vaianginian-Hauterivian transgression (Midd)mrtiss 1976, )979) and (b) TerebrnrrrIII eorrhrrilensis of the fv)eocomian of northern Mexico is probably synonymous vrdth it. ln viesv of my thesis of the 2ura af5ni ties of the south-west Moroccan fauna the occurrence of this species would be siomi6cant. Unf'c rtunately there is no evidence thai RII the records do Bot refer to 8 selfrr, ahhough soxne may refer to 8oNfrei rhyris p)erQ.

SeN'tkyris se/kr (J. dc C, Sow) is recorded by both Roch and Ambroggi lrom the 8arrcmian and Gaxgasran RBd by Roch froxn the 8edouhan Rlso. ThIS RIInost IrbIcturtous Lower Cretaceous spccrcs would bc expected to occur in south-west Morot~ especially as an undescribed form of it is ccrrairrly known from the Lower CretaceOus of the High Plateaux region Ol Algeria. IB 1' hc Gentg Collection are twenty-three specdmens from Tinirt Ait Ameur (labelled 8errisian-Va)anginian but more hkely HanterIVxan) winch appear to be thrs obese Algenan varrety of the specres. There Is alISO onc specimen frnm the Hautcrivian ofOucd Tidzi, one from the Barremian of Ida ou Trournma, and Iwo from tlhc 8~an of Tibourr'm; these resemble the more normal somewhat depressed Neocomii,an form of the species

Ncsrrcaifiryris dsrlemrnfennxr (d'Grbigny), Ttus almost ubiqmtous Albian species is recorded by both