304 ARCHEGOCOPTIS, UROCOPTIS. 



series of shallow pits. Whorls ordinarily 7% to 8%, but 

 slightly convex, the last shortly free in front, having a narrow, 

 cord-like carina around the base, which is convex and sculp- 

 tured with straight, thread-like striae. Aperture subcircular, 

 oblique, the peristome expanded, subreflexed. 



Length 30, diam. 8 mm. ; whorls 7%. 



Length 26, diam. 7.7 mm. ; whorls 6%. 



Length 35%, diam. 7.8 mm. ; whorls 12%. 



Length 39, diam. 8.5 mm.; whorls 8 (v. Mart. type). 



Haiti: Jeremie (Weinland, J. B. Henderson); Anse 

 d'Hainault (H. Rolle). 



Cyl. crenata Weinl. & Mart., MARTENS, MaJak. Bl., vi, 1859, 

 p. 54. PFR., Monogr., vi, p. 364; Novit. Conch., p. 440, pi. 97, 

 f. 33, 34 (bad). CROSSE, J. de C., 1891, p. 138, pi. 1, f. 7, 7 a 

 (not good). ???0. petiveriana SOWERBY, Conch. Icon., xx, 

 pi. 13, f. 114 (bad). 



Besides the differences given under A. eximia, this species 

 differs from that in the sharper striation below the basal keel. 

 The sutural dark spots are less developed, the sculpture being 

 more obsolete generally. In one specimen with only 6% 

 whorls, collected by Mr. Henderson, the apical septum is ab- 

 normal, being long and conic. The delicate pustules on the 

 septum are frequently rubbed off. 



Crosse does not seem to have noticed the chief differences 

 between crenata and eximia, in the stronger basal keel and 

 smaller mouth of the latter. 



It is impossible to tell whether the rude figures referred to 

 by Ferussac under his H. petiveriana were drawn from ex- 

 imia or crenata. Sowerby's figure is equally dubious. 



UROCOPTIS. 



U. CYLINDRUS (Chemn., Desh.). Page 137. Pupa violacea 

 Swainson, Exotic Conchology, 2d edit., by S. Hanley, p. 39 

 (1841), is undoubtedly U. cylindrus. I have not seen the 

 original edition of " Exotic Conchology," which appeared in 

 1821-22. If the description of P. violacea appeared therein, 

 it was the first adequate diagnosis of this fine Jamaican shell. 

 Chemnitz's description and figures, upon which Dillwyn and 

 Wood depend, are ambiguous, and may apply to some allied 

 form as well as to that subsequently fixed upon by Deshayes. 



