14 



Spirialis Gouldii, nob. See page 8. 



Calyptr^a striata Say. This species occurs at St. 

 George's Bank. 



Adeorbis costulata, nob. Margarita 7 costiilata, Moller. 



? costulata, Forbes and Hanley. In deep water off 



Cape Ann, I have obtained a few specimens of a shell which I 

 consider to be the same as that to which the above names have 

 been apphed. It is minute, about one tenth of an inch in diame- 

 ter, white, somewhat thick and rugged near the apex, the sculp- 

 ture appearing to advantage only on the thinner and more deli- 

 cate outer whorl, which is convex, rounded, and covered with 

 prominent, crowded ribs. On the side of the whorl many of 

 these ribs divide into two, thus occupying the increased space, 

 and beneath, the ribs flow into each other and gradually disap- 

 pear without interrupting the five distant, elevated, spiral striae 

 on the umbilical half of the base. The umbilicus is deep. The 

 aperture is rounded, with the peristome continuous. The oper- 

 culum is multispiral, of about eight volutions, of which the outer- 

 most are testaceous, presenting a frosted appearance ; the 

 central volutions, occupying about one fourth of the diameter, 

 are corneous. 



Moller's description of the species is very short; that of 

 Forbes and Hanley is extended, and will not apply to my shells 

 in every respect, but as it was drawn up from a specimen in a not 

 very perfect condition, the differences may not be of importance. 

 The Marg. minutissima of Mighels is probably identical with this 

 species ; his description appeared a year after that of Moller. 



Rissoa eburnea, nob. n. s. T. parva, ovato-conoidea, alba, 

 nitida, Isevis. Anf. 4 convexiusculi, ad sufuram subangulati ; 

 apertura ovato-elliptica, labro tenui, simplici, acuto, antice 

 effuso. Long. .16 ; lat. .09 poll. 



This species resembles some varieties of JR. ventrosa, but is 

 much more angular. Two specimens were taken in thirty 

 fathoms, off Cape Ann. 



RissoA multilineata, nob. n. s. T. minuta, oblongo-ovata, 

 obtusa, alba ; anf. 5-convexi, striis transversis, minutis, ad 

 20, — ornati ; apertura orbiculato-ovata, labro baud incrassato, 

 effuso. Long. 1 ; lat. .045 poll. 



