PLEURODONTE. 91 



Dentition characterized by the absence of side cusps on central 

 and lateral teeth, a lateral continuation of the reflexed cutting edge 

 of the mesocones representing the absent side cutting points. Mar- 

 ginal teeth having a large, bifid mesocone and a small simple or bifid 

 ectocone (pi. 24, fig. 8, P. orblculata; pi. 24, fig. 12. P. dentiens). 



Genitalia without accessory organs on the female side, the duct of 

 the sperrnatheca long. Penis having the retractor muscle inserted 

 at its apex, and continued above in a long epi phallus terminating in 

 a flagellum (pi. 24, fig. 10, P. orbicnlata). 



Distribution, Lesser Antilles. 



In this group the shell is solid and opaque, as in Caracolus s. str., 

 but the basal lip is widened and more or less distinctly toothed. It 

 is closely allied to the Pleurodonte series, of Jamaica; and while it 

 is easy to distinguish the two groups on sight, it is extremely difficult 

 to point out the differences in words. Anatomically Caprinus and 

 Pleurodonte are similar. 



It is much to be regretted that the well-known name for this sec- 



O 



tion had to be rejected ; but it is better to correct the mistakes of 

 early systematists than to perpetuate them. 



P. nuxdenticulata Chemn., v, 82. v. guadeloupensis Pils., v, 87. 



putictata Born not Mull. P. lychuuchus Mull., v, 87. 



hippocastaneum Lam. recognltus Montf. 



P. nucleola Rang, v, 82. P. josephinse Fer., v, 88. 



crassidens Pfr. scabrella Mke. 



P. parilis Fer., v, 83. v. nevisensis Pils., v, 89. 



pseitdoparilis Grat. P. perplexa Fer., v, 89. 



P. obesa Beck, v, 83. granifera Gray. 



P. dentiens Fer., v, 84. P. formosa Fer., v, 90. 



v. isabellina Pils., v, 85. lenoeinia Fer. 



P. Isabella Fer., v, 85. P. pachygastra Gray, v, 90. 



barbadensis Lm. fuscoviridis Grat. 



guildlngi Pfr. dolata Fer. 



P. orbiculata Fer., v, 86. P. nigrescens Wood, v, 91. 



P. badia Fer., v, 86. fuliginea Fer. 



Section Gonostomopsis Pilsbry, 1889. 



Gonostomopsis PILS., Man. Conch, v, p. 92. Chrysodon ANC., 

 Conchol. Exch. i, p. 54, 1887, not Chnjsodon Okeu, 1815. 



