Perkins.] 112 [October 6, 



are imbedded. These are regularly arranged in longitudinal rows, 

 there being usually six rows. The cases are fastened at one end, and 

 taper from the free end till near the point of attachment, where they 

 suddenly become quite small. There is a slight elevation of the 

 surface over each ovum. The length is quite variable, average spec- 

 imens being from 72 mill, to 95 mill. long. The diameter is about 

 6 mill. The ova are 2 mill, long and 1.2 mill, broad. Rarely the 

 cases are attached at both ends. 



GASTEROPODA. 



MUHICID^. 



Urosalpinx Stimpson, 1865. 



Urosalpinx cinereus Stimpson, Am. Journ. Conch., Vol. i, 

 pt. i, p. 58, pi. viii, figs. 6, 7. Fusas cinereus Say, Am. Conch., 

 pp. 79, 184, pi. xxix, 1831; De Kay, Moll. N. Y., "p. 145, pi. viii, 

 fig. 184. Rapana? cinerea Stimpson's Check List. Buccinum plico- 

 sum Gould, Invert. Mass., p. 303, fig. 213. 



Very abundant, especially on rocks near low water. Animal light 

 yellow; tentacles short; eyes on outer side, about half way between 

 the base and tip; foot rounded and notched behind, straight in 

 front; operculum thin, corneous, ovate, chestnut brown. Teeth 

 1-1-1; lateral teeth simple, not much curved; median tooth broad, 

 with three large denticles in the centre and several small onea 

 each side. 



MEASUREMENTS. 



Length of shell 24.6 mill. Breadth 15 mill. 



" operculum 8.4 " " 4.4 



" foot 14.4 " " 8.6 (before), 6.8 (behind). 



" tentacles 5.4 " 



The ova capsules are attached in clusters to rocks, shells, etc., near 

 low water ; they are ovate, with short peduncle, broadest above, 

 with the aperture in the centre of the upper margin ; they are 

 much flattened, arcuate, with a ridge running down each side; color, 

 very light yellow. Ova 10-20, yellow; deposited in June. Height 

 6.4 mill.; greatest breadth 4 mill.; diameter 1.4 mill.; aperture 1.6 

 mill. 



