194 CRETACEOUS PELECYPODA 



23. — C, ollonga, d^Orb.^ is a Venilieardia. 



24^.-^0. Ligeriensis, d'Orb., apparently belongs to the same sub-genus^ which determination 

 appears to be supported by the specimen figured by Geinitz (Kieslingsw., &c.; pi. ii, fig. 13), 

 under the name of C2/p, rostrata, 



25-26. — (7. Neptmii, d'Orb. ; C. Ar cMaciana, d'Ovh. (Crassatella quadrata, d'Areh.) ; of 

 neither of the species are the hinges known. 



27. — ? G. 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 Venilicardm^ as the figures of the 

 casts only show two cardinal teeth. 



30, — C, consolrina, d^Orb._, is an Anisocardia. 



31-37.--(7. Coniacensis, Coq., C. elongata and Eoyana, d'Orb., C, Geneti srndi Edgar di, Coq., 

 C. Bosquetiana and ProvenciaUs, d^Orb.^ are all as yet very imperfectly known. 



38. — C. cor data, Sharpe^ has much more the type of a Caryatis than of any genus belonging 

 to the GlossiDuE, 



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



40-42. — G. bifida, C. crassidentata, and cycladiformis of Zittel all belong to Veniella ; the first 

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

 Anisocardia, 



43. — G, crassitesta, Rss.^ uncertain. 



44-45. — Cypricardia isocardia ^nd suicarinata oi di'OYhigTLj are almost only known by their 

 names. 



46. — G testacea, Zittel, is either a Veniella or a Venilieardia ; the anterior teeth are not sufil- 

 ciently clearly drawn to decide on this point. 



47-49. — (7. tricariiiata and trapezoidalis, Eom., sp., and G. protract a, Ess._, are only known 

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

 Glossocardia and Veniella, &c. 



50.—-%?. Valdensis, Loriol, (Mat. Pal. Suisse, 4"^^ ser., 1868, p. 24,) has the external form 

 of a Glossocardia. 



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



52-56. — Isocardia neocomiensis, ( Geromya apud Agassiz, ? = 1, gaultina, P. and C), J. Valan-^ 

 giensis, P. and C., I. prcBlonga, Leyni., /. 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 Geromya, 



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

 approaches the recent Glossies 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. — /. cryptoceras, obliqua, semiradiata, Garentonensis, and Benauxiana of d^Orbigny 

 are all imperfectly known. 



63. — I. pyrenaica, d'Orb., may, as already mentioned, belong to the sub-genus Gioatrea 

 of Gyprlna. 



64-69.-7. longirostris, Eom., ( =^ I. ataxensis, d'Orb., and Gyp, Boissyi, d'Arch., and 

 ?=I, trigona, Rom.), /. cretacea, Goldf., /. turgida. Ess., /. lunulata, Eom,, /. pygmcea, Ess., 

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



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

 Pescript. d. Moll. foss. de Lemberg, 1869, p. Ill), 



71, — /. suh-quadrata, Alth., rather appears to be a cast of a Gardium than of any species of 

 GLOSSID.E, (vide Favre, 1. cit., p. 111). 



