I 



MUSEUM OF COMPARATIVE ZOOLOGY. Ill 



equal or n.arrowor interspaces, the fasciole witli mnch finer threads or nearly 

 smooth ; transverse scul[)ture of i'uint waves or obsolete ribs (about nine on the 

 last whorl) with a tendency to bifurcate toward the canal ; suture strongly 

 appressed with obscure undulations on the margin of the fasciole bordering the 

 suture ; base rounded conic ; spire acute ; whorls below the fasciole moderately 

 rounded; varix thick, broad, and strong, with a slight depression behind it; 

 canal short, slightly recurved; anal sulcus shallow, rounded; aperture very 

 narrow, about nine liraj inside the outer lip, stronger posteriorly ; lira) on the 

 inner lip and pillar (mature ?) less strong and not so numerous. Max. Ion. of 

 shell, 12.3; of last whorl, 8.0; max. lat. of shell, 5.3 mm. 



Habitat. U, S. Fish Commission Station 2123, near the island of Trinidad, 

 in 117 fms., mud, bottom temperature 59°. 5 F. 



This species is smoother than any yet described, but it is possible the strength 

 of the transverse sculpture may be greater in some individuals. The most 

 prominent characters beside the weak transverse sculpture are the appressed 

 fasciole at the suture, and short sharp spire. It has a much shorter canal, 

 narrower mouth, and less channelled fasciole than G. Gabbii. 



Subgenus MANGILIA (Leach) Risso. 



Many of the species referred to this group are only known from the shells. 

 Except in cases where it is otherwise stated, the reference must be understood 

 as provisional. 



Mangilia caribsea Orbignt. 

 Pleurotoma carihcea Orb., Moll. Cuba, II. p. 172, pi. xxiii. figs. 32, 34, 1846. 

 Habitat. Barbados, 100 fms. Martinique, Guadelupe, and Cuba, Orbigny. 



Mangilia Lavalleana Orbigny. 



Pleurotoma Lavalleana Orbigny, Moll. Cuba, II. p. 174, pi. xxiv. figs. 7, 9, 1846. 

 Pleurotoma Vespuciana Orbigny, op. cit., p. 175, pi. xxiv. figs. 13, 15. 



Habitat. Barbados, 100 fms. Antilles, Orbigny. 



The two forms named by Orbigny would appear to differ only in age. P. 

 antillarum Orbigny, which grows half an inch long, is probably another species. 



Mangilia atrostyla Dall. 



? Drillia Umonitella Dall, Proc. U. S. Nat. Mus., 1883, p. 329, pi. x. fig. 10, Dec., 1883. 

 Daplmella atrostyla (Dall, MS.) Tryon, Man., VI. part 3, p. 310, pi. xxxiv. fig. 100, 



October, 1884 (as var. of cenwa). 

 Mangilia ephamilla Bush, Trans. Conn. Acad., VI. p. 457, pi. xlv. figs. 4, 4 a, June, 



1885. 



Habitat. Barbados, 100 fms. Station 185, near Dominica, in 333 fms., sand, 

 bottom temperature 44<*.0 F. Northward to the coast of North Carolina, U. S. 

 Fish Commission. 



