mi. CRETACEOUS PELECYPODA 



33. — C. ohlonga, d'Orb., is a FenUicanUa. 



2|,_ C. Ligerienais, d'Orb., apparently belongs to the same snb-gcnus, wliicli dctermi nation 



appears to bo supported by the specimen figured by Geinitz (Kieslingsw., he, pi. ii, fig. 1:3), 

 under the name of Cj/p. roslrata. 



2.5-20. — C. Neptuni, d'Orb.; C Arc//iaciana, d'Orh. (Crassatella qnadrala, d'Areli.) ; of 

 neither of the species are the hinges known. 



27. — ? C. incerta, d'Arch. This is a remarkable species, having much of the form and 

 character of a Tancredia, but it could also be a Veniella. 



28-29. — C. Noueliana and C. intermedia, d'Orb., are perhaps Venilicardia, as the figures of the 

 casts only show two cardinal teeth. 



30. — C. cousohrina, d'Orl)., is an Anisocardia. 



31.37. — C. Coniacensls, Coq., C. eloiigala and Uoyana, d'Orb., C Geneli and Edyardi, Coq., 

 C. Bosqiietiaiia and Provencialis, d'Orb., are all as yet very imperfectly known. 



38. — C. cordata, Sharpe, has much more the type of a Cari/atis than of any genus belonging 

 to the Glossid/e. 



39. — C. orbicularis, Rom., is very likely an Anisocardia . 



40-43. — C. bifida, C. crassidcnlalu, and cycladiformis of Zittel all belong to TenieUa ; the first 

 and probably also the second belong to the sub-genus Tenillcardia, and the third is perhaps an 

 Anisocardia. 



43. — C. crassitesta, Ess., uncertain. 



41-1-5. — Cj/pricardia isocardia iiud subcarina/a o( (\'Or]>\gny are almost onlj' known I)y their 

 names. 



46. — C. iestacea, Zittel, is either a Veniella or a Tciiilicurdia ; the anterior teeth are not suffi- 

 ciently clearly drawn to decide on this point. 



47-49. — C. tricarinata and trapezoidalis, Eom., sp., and C. prolracta, Rss., arc only known 

 from imperfect casts; they all have the general form of Trapezium and of the externally allied genera 

 Glossocardia and Veniella, &c. 



50. — Cyp. Valdensis, Loriul, (Mat. Pal. Suisse, 4™ ser., 1SG8, p. 21,) has the external form 

 of a Glossocardia. 



51. — Apricardia carinata, Guer., vide p. 185. 



52-56. — Isocardia neocomiensis, ( Ceromi/a apud Agassiz, ? = I. ganltina, P. and C), /. Valan- 

 giensis, P. and C., I. pralonga, Leym., /. Montmollini, P. and C, and /. angulata, Phil. : 

 of none of these are the hinge-teeth known, the shells have the general form of Anisocardia, but 

 some of them are so thin that they could moreover indicate species of Ceromi/a. 



57. — I. similis, Sow.; this is almost the only species which in general character very mueli 

 approaches the recent Glossus cor, but the tooth of the right valve figured seems to me, though 

 imperfect, to indicate by its position rather a Veniella or Anisocardia than a Glossus. 



58-62. — /. crrjptoceras, obliqua, scmiradiata, Carenlonensis, and Renauxiana of d'Orbigny 

 are all imperfectly known. 



63. — /. jMjrenaica, d'Orb., may, as already mentioned, belong to the sub-genus Cicalrea 

 of Ci/prina. 



64-69. — I. longirostris, Rom., ( ^ I- ataxensis, d'Orb., and Ci/p. Boissyi, d'Arch., and 

 ,^=:/. trigona, Rom.), /. cretacea, Goldf., /. turgida, Rss., /. lunulata, Rom., /. pygmaa, Rss., 

 /. modiolus. Nils., are only known from imperfect casts. 



70. — /. galiciana, Alth., has the form of a Cicalrea, but the hinge is not known, (vide Favre, 

 Pescript. d. Moll. loss, de Lemberg, 1869, p. 111). 



71. — /. *K^-(/««f/ra^rf, Alth., rather appears to be a cast of a Curdiicm tluin of any species of 

 Giossin.jc, (vide Favre, 1. cil., p. ill). 



