402 CRETACEOUS PELECYPODA 



o;32. /.«/•«/«*, Con., Lyiich's ExpeiJ., p. 2-26j from Paluistine ; Fraas considers this to be 



identical with /. Lamarcki. 



233-235. /. sijriacus, clccdlm, and L/jnchii (il)idem) are also noted by Conrad from Palaestine. 



236-24'0. /. Cnpalanus , midllpllcatm, diversiis, Geinitzianus, labiatics, and simplex, Gervillea 



soleiioide.s and 3Ieli)ia valida occur in the South Indian cretaceous rocks j three of the species are 

 also European and have been already referred to. 



C. VVLSELLIN^. 



•2i,i. — Chahiiasia turoniensis* (Vulsella), Duj., Mem. See. Geol. de France, II, p. 228, (see 



p. 397). 



242-243. — fulsella aviculoides and pernoides, Coq. (see p. 397). 



244. — Nai/adina Heberti, M.- Chalmas, (see p. 397). 



lih-l^Q.— Vulsella falcata,'Mx\\\st., {a.-^\\(ii Goldf., Petraef. Germ., pi. 107, fig-. 10), and 

 V. trigona, SchafhiEutl, (Siid-Bayern's Leth. Geog., 1S63, p. 152,) both appear to belong to 

 Nayad'ina. The former species was identified by d''Archiac with one from the eocene beds at 

 Biaritz; this last is an inequivalve shell, while Miinster's species is equivalve. Schafhseutl 

 says that it is a cretaceous fossil, and it certainly shows marked relations to Nayadina Heberti. 

 D'Orbigny (Prod. II, p. 327,) who regards Miinster's and d'Archiac's shells as the same, 

 transfers them to the genus Ostrea under the new siJecific name 0. Ilersilia, d'Orb. 



247. — Vuls. jyretiosa, Eich., (Leth. Ross., xme livr., p. 501.) has the general form of Nayadina, 

 but the valves appear to be somewhat unequal and flattened. 



PSEUDO-MONOTIS, Bey rich, 18G2, (see p. 389). 



1. PsEUDO-MOXOTis [Oxytoma] semiglobosa, StoUczka, PI. XXVI, Pig. 1. 



Fseudo-m. testa sinistra parva, globosa, tnmida, sub-rotundata, paiilo obliqua, 

 inceqttilaterali, apice inciirvo, lato ; margine cardinali recto, auricula aiitiea brevi, 

 obtusa, postica (ut videturj pardo prolongata, angusta, infra distincter insinuata ; 

 superjicie costis novem radiantibus, lateraUter 2)aulo distant ioribus quam in medio, 

 et sir lis concentricis fiUformibus ac confertissimis ornata. 



The single valve, though not quite perfect, shows by its very tumid rounded form 

 that it belongs to a species distinct from any other known from cretaceous deposits. 

 The ears appear to be small, like in Fs. interstriata , Eichw. ; the anterior is 

 short, tumid, not distinctly separated from the valve; the posterior narrow and 

 deeply emarginate below ; it seems to have been only a little longer than shown 

 in the figure, its point being broken off. There are nine radiating, rather sharp ribs 

 on the valve, those at the sides diverge slightly more than those in the middle ; no 

 intermediate ribs are present, but the surface is very densely covered with filiform 

 striae of growth. 



LocaUty. — Karapaudy, in a conglomeratic sandstone. 



Formation. — Arrialoor group. 



* I do not tLink tliat the identification of Dujardin's species with Woodward's Ostrea concentrira 

 (Geol., Norfolk, 1833, p. 48, pi. vi, fig. 5,) has been satisfactorily proved, but the latter is to all appearance the same as 

 O. Gehrdensis, Roemer, (Nordd. Krcidef., pi. viii, fig. 1). Coquand (Monog. Ostr. cret., 1869, p. 195,) seems to me 

 to go too far with his identifications of species resembling each other in external characters, while the true identity can 

 only be proved by the study of the internal structure of the valves. 



