362 CRETACEOUS PELECYPODA 



7. Phaseolicama, Valeuc, (Chenu, Mauucl do Concli., II, 157). Shell 

 ovately elongated, equivalve, inflated, with the beaks suL-anterior, hinge tooth- 

 less ; the muscular scars are stated to be long and strong, and the pallial line 

 complete; type, Ph. Ilagellanica, Val. The animal has the mantle with three 

 openings, the anterior being for the passage of the foot, the gills and palps are 

 elongated. Chenu introduced this genus in the iamiU Mytilidje : its form is 

 very similar to that of 3Iodiola, but it would appear that the mantle margins are to 

 a great extent united. 



List of cretaceous species. 



Pictet and Campiche (Mat. p. 1. Pal. Suisse, IV™ ser., 3™ part., p. 344,) admit the fol- 

 lowing species : — 



l-Q. — M^ocotic/uc Stii'jciuili''i)iri, horio], ffanl/ii/a, Vict, and Camp., cretncea, d'Orb., ungiilnta, 

 d'Orb., dilatata Zittel, and Ueqiiieniana, Math. 



7.9. — J/, elVipiica, Romer, minima, Reuss, and M. (Mod'iolina) discrepans, Miiller. 



M. supraoretacea, d'Orb., is a problematic species, and M. Neocomiensis, d'Orb., is supposed 

 to be identical with Sabaudiaiia. M. cretacea is g-iven by Eich waldalso from the so-called neocomien 

 beds at Kboroschowo and from glauconitic beds near Orenburg, and M. minima from the Ceuomauien 

 of the neighbourhood of Kiew, (Leth. ross., Xme livr., 1S67, pp. 538 and 54.0). 



10. — M. StrajewsJciana, d'Orb., (ibid. p. 539,) is also placed by the same author in the neocomien. 



11. — M. Ferreti, Gueranger, Album paleon. de la Sarthe, 18C7, pi. xxii, tig. 8. 



12. — M. gracilis, Drescher, Zeitsch. d. deutseh. geol. Gesellseh., vol. xv, 1863, p. 350. 



13. — M. suh-ovata is the only species which occurs in the South Indian cretaceous rocks. 



MYOCONCHA, Soiverhy, 1825, Cvkle p. 360). 



1. Myoconcha sub-ovata, StoUczka, PI. XXIII, Fig. 1. 



IIijoc. testa suh-ovata, modice injlata, crassa, an lice anguste obtusata, postice late 

 stih-rotundata, margine dorsali leviter curvato, ventrali sub-recto, j^i'OJie termina- 

 tlonem antet'lorem 2}aulo insluuato ; umbonibus sub-anticis, depresslusculls ; supevjicie 

 striis incremeiiti lamellosis et ad margiuem dorsalem duabus costulis radian tibus 

 notata. 



Length : greatest height of valves ... ... ... ... 2'02 



„ : „ thickness „ ... ... ... ... 2-77 



The elongately ovate shape and rather uniform convexity of the valves 

 readily distinguish the i^resent species from any other cretaceous form. The shell 

 is of considerable thickness, but not Avell preserved on the figured specimen, its 

 surface being somewhat weathered off; it shows only strong concentric striae of 

 growth. Another specimen shows near the dorsal margin two ribs which begin 

 at the apex and proceed posteriorly in a manner similar to that seen in 31. cretacea. 

 This second specimen, being partially a cast, also exhibits the impressions of the 

 two adductors, which are of the usual form : the anterior situated on a thick 



