MUSEUM OF COMPARATIVE ZOOLOGY. 91 



Yucatan Strait, 640 fnis. 



A solid, rather uninteresting-looking shell, with few attractions, but differing 

 from any of the species described by Watson. 



Columbella (Astyris) Duclosiana D'Orbignt. 

 C. Duclosiana D'Orbigny, Sagra Moll. Cub., II. p. 136, Tab. XXI. figs. 31-33. 1853. 



Station 20, 220 fms. Sigsbee, off Havana, in 450 fms. 



These specimens, being dead, may have been washed off shore. The species 

 might well be a variety of G. dichroa Sowerby, and faded specimens recall 

 C. lunata Say. 



Columbella (Astyris?) amphissella n. s. 



Shell small, stout, blunt-tipped, yellowish white, of four and a half whorls ; 

 nucleus large, white, shining, smooth, and naticoid, of one and a half whorls ; 

 transverse sculpture of numerous (on the last whorl twenty-one) straight sub- 

 equal plications with about ecpial interspaces, beginning at the suture, passing 

 clear over the whorl, and fading out only when near the canal ; also faint lines 

 of growth ; spiral sculpture of numerous equal fine rounded threads (twenty- 

 one on the last turn) with slightly wider interspaces, covering the whole shell 

 except the nucleus ; pillar short, stout, a little concave, with a slight callus ; 

 outer lip somewhat thickened, smooth ; canal wide, short, but distinct ; sutures 

 distinct. Lon. of shell, 4.0 ; of last whorl, 3.0 ; of aperture, 2.0. Max. lat. of 

 shell, 2.0; of aperture, 1.0 mm. 



Yucatan Strait, 640 fms. 



This stout and prettily reticulated little shell has almost the form of am- 

 phissa versicolor Dall, from California, though of course on a very diminutive 

 scale ; the character of the sculpture is also not dissimilar. The nearest West 

 Indian species to it is Columbella Hotestieriana D'Orbigny, which has a toothed 

 aperture, one more whorl, an acute spire, and different color. It is not unlike 

 G. costulata Cantraine as figured by Sars, but has a proportionately shorter 

 spire, fewer whorls, more numerous plications, and is of about one ninth the 

 size. By some authors this species would be referred to Anachis. 



Columbella (Astyris) Verrilli n. s. 



Shell slender, conical, yellowish white, with about seven whorls ; surface 

 polished, but when in a perfectly fresh condition covered by a rather shaggy 

 brown epidermis, whose surface projects in irregular lamella', as in Astyrit 

 caUforn/ica. Nucleus naticoid, shining translucent white ; spiral sculpture 

 appearing only on the pillar and basal surface where there are ten or twelve 

 well-marked close-set revolving threads, which grow taint. -r toward the pe- 

 riphery ; microscopic revolving bines may occasionally, though rarely, be 



