62 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXIV 



Growth has been retarded towards the columellar wall and accentu- 

 ated towards the palatal margin. This idea is substantiated by 

 the crushed and thickened growth-lamellae along the basal and 

 columellar margins. A. J. Wagner's figures (1905, 1907) are very 

 diagrammatic; that of Fischer (1893), although somewhat vague, 

 shows the fundamental structure much better. The separation of 

 this group from Eutrochatella s. s., even as a subgenus, is only 

 justifiable on the grounds of the peculiar shell and opercular 

 characters. 



Subgenus EUTROCHATELLA s. s. West Indies; Venezuela??? 

 Section Ustronia A. J. W. Cuba. 

 Uslronia A. J. Wagner (1908). Type (now chosen) H. sloanii d'Orbigny 

 (1845). Cuba. (=H. sloanei A. J. W. and authors, not of d'Orbigny). 



The radula of the type species has been figured and described 



by Troschel (1856-63). I have re-examined this species, 52 and have 



also studied E. acuminata columellaris 53 and E. remota. 5i I am 



unable to name any definite characters of the radula that will 



separate this group from the next. It appears to have a smaller 



number of unicuspid marginals than does Eutrochatella s. s. The 



specimen of E. acuminata columellaris has a minute, but very 



sharp-pointed cusp at the inner end of the margin of the B-central. 



Section Excavata A. J. Wagner. Cuba, Haiti, Jamaica. 

 Excavata A. J. Wagner (1907). Type (by tautonomy) H. excavata Pfr. 

 (1855). Haiti. 



In this section the radula of E. chrysostoma ("Sh." Pfr.) (1850) 

 has been described and figured by Troschel (1856-63). 



Section Eutrochatella s. s. Jamaica. 

 Ampullina Blainville (1825). Not Saint-Fond (1803) etc. Type A. 



striata Blainville (1825). 

 Trochatella Swainson (1840). Type H. pulchella Gray (1825). Jamaica. 



Not Trochatella Lesson (1830). 

 Eutrochatella Fischer (1885). Type H. pulchella Gray. 

 Granifera A. J. Wagner (1907). Type H. pulchella Gray. 



In this section the radula of the type species of the genus 55 



has been examined and is figured (Plate VI, figs. 31 and 32). 



Troschel (1856-63) has described and figured that of E. tankervillii 



(Gray) (1825). His statement that all of the marginals are unicuspid 



52 2 dried specimens; A. N. S. P. no. 93661; collected near Havana, Cuba, by 

 C. F. Baker. 



' 3 1 alcoholic specimen; sent me by J. B. Henderson; western Cuba. 



A 1 alcoholic specimen; sent me by H. B. Henderson; western Cuba. 



55 1 alcoholic specimen; A. N. S. P. no. 101221; collected near Mandeville. 

 Jamaica, by A. P. Brown (1910), and 1 slide, in the collection of the A. N. S. P 

 mounted by A. P. Brown. 



