284 A. S. PACKARD, Jr., ON THE RECENT 



Margarita undulata Sowb. and Bbod. 



Of common occurrence at a depth of fifteen to twenty fathoms ; sandy bottom. 



Margarita varieosa Mighels. 



Found abundantly along the whole coast. At Square Island in ten to thirty fathoms. 

 Straits of Belle Isle, fifty fathoms. 



Margarita helieina Moll. 



This species was very plentifully found at a depth varying from two to fifteen fathoms. 



Margarita campanulata Mouse nov. sp. [PI. VII. fig. 15, 15a.] 



Shell umbilicated, depressed, thin, translucent, smooth and shining ; composed of four 

 volutions, last whorl rapidly expanding. Aperture large, outer lip flaring. Plane of aper- 

 ture nearly at a right angle with the axis of the shell ; breadth one-sixth of an inch ; 

 height one-twelfth of an inch. This species has always been confounded with Margarita 

 helieina, which it somewhat resembles. The differences are seen in its smaller size, in its 

 greater depression, and the rapidly expanding outer whorl and flaring aperture. We have 

 examined hundreds of specimens from Portland Harbor and various points on the coast of 

 Maine, and have seen specimens from Labrador, and the characters hold good in every speci- 

 men. The color of the extended animal is different from that of Margarita helieina. — Morse. 



Bissoa minuta Stumps. 



One dead specimen occurred ; it was found above high-water mark. 



Bissoa castanea Moll. 



Rissoa exarata Stimps. 



Dredged at a depth of fifteen fathoms on a sandy bottom. 



Velutina haliotoides Mull. 

 Found not uncommonly in deep water on the whole coast. 



Lacuna vincta Turt. 

 The plain and banded varieties were common. Taken at Square Island in thirty fathoms. 



Littorina vestita Gould. 

 T. vestitus Say ; L. rudis Gould. 



Not uncommon along the whole coast. 



Littorina palliata Goitld. 

 Littorina littoralsi, Forbes and Hani. 



Both of these species occurred abundantly and with variations, as in Maine. 



Scalaria groenlandica Perry. 

 Of this species we were able to obtain only a fragment of a specimen. 



