GEOGRAPHIC DISTRIBUTION. 



XV11 



D. octcmgulatum group, tbe subgenera Graptacme, Compressidens, 

 Polijschides, and the Cadidus acus group, are forms which this region 

 has in common with the Panamic province, but which are wanting 

 in the Eastern Atlantic thus far. The list of species common to 

 both sides of the Atlantic will probably be increased ; but still the 

 affinity of "West Atlantic and especially the Gulf of Mexico Scapho- 

 pod fauna with that of the Panamic region, is upon the whole as 

 fundamental as that between the two sides of the Atlantic. 



D. laqueatum, p. 10. 

 D. gouldii, p. 20, 247. 

 D. picteti, p. 22. 

 D. carduus, p. 30. 



(Antalis.) 

 D. disparile, p. 56. 

 D. ceratum, p. 57. 

 D. antillarum, p. 57. 

 D. taphrium, p. 58. 

 *D. entails, p. 42. 

 *D. agile, p. 46. 

 *D. occidentale, p. 47. 



( Heteroschisma.) 

 *D. subterfissum, p. 61. 

 D. callithrix, p. 62. 



( Fiss identa Hum.) 

 D. amphialum, p. 71. 

 *D. candidum, p. 72. 

 *D. capillosum, p. 77- 



( Graptacme.) 

 D. sericatum, p. 86. 



Entalina platamodes, p. 133. 

 *Siphonodentaliurn lobatum. 

 S. tytthum, p. 137. 

 *alofotense, p. 138. 

 *S. affiue, p. 140. 



D. eboreum, p. 89. 

 D. leptum, p. 89. 

 D. seniistriatum, p. 90. 

 D. circumcinctum, p. 88. 

 D. calamus, p. 97. 



(Lcevidentalium.) 

 D. callipeplum, p. 100. 

 D. ensiforme, p. 101. 

 D. perlongum, p. 104. 

 D. matara, p. 105. 

 D. liodon, p. 107. 



(Episiphon.) 

 D. sowerbyi, p. 117. 

 *D. filura, p. 118. 



(Bathoxiphus.) 

 *D. ensiculus, p. 121. 



( Compressidens.) 

 D. pressum, p. 124. 

 D. ophiodon, p. 126. 



(Fustiaria.) 

 D. stenoschizum, p. 128. 



*C. amphora, p. 161. 

 *C. Jeffreys!, p. 164. 

 *C. gracilis, p. 165. 

 C. minusculus, p. 164. 

 C. lunula, p. 167. 



Cadulus(Polyschides) tetraschis- C. watsoni, p. 167. 



tus, 148. 



C. (P.) tetrodon, p. 151. 

 C. (P.) carolinensis, p. 152. 

 C (P.) bushii, p. 153. 

 C. (P.) spectabilis, p. 153. 



C. rushii, p. 168. 

 C. agassizi, p. 168. 

 C. hatteraseusis, p. 169. 

 C. poculum, p. 170. 

 C. vulpidens, p. 170. 



