A. E. Merrill — Catalogue of Marine Mollusca. 
469 
abruptly flattened subsutural band, above t lie shoulder, is covered 
with numerous much finer and closer revolving lines; on the anterior 
part of the body-whorl the cinguli are rather stronger than on the 
middle, and separated by wider grooves, but they are only slightly 
roughened by the lines of growth; on the canal they become finer 
and closer; between the carina and the base of the canal there are 12 
to 14 cinguli. The nucleus is small and regular; at first smooth, then 
two raised spiral lines begin on the first whorl, and soon become dis- 
tinct carinse, on the second to third whorl, the upper one forming the 
shoulder; slender transverse riblets begin on the second, and become 
very evident on the third whorl. 
Aperture narrow-ovate, angulated posteriorly; sinus broad and 
shallow; outer lip, in front of the sinus, distinctly flattened, then 
broadly rounded, very slightly incurved at the base of the canal, 
which is narrow, a little produced, and slightly curved ; columella 
decidedly sigmoid, its inner edge excurved at the end. 
Color of the shell white, or pale greenish white, covered with a 
thin, pale green epidermis. 
The tentacles are short and obtuse in alcoholic specimens, with 
conspicuous black eyes ; penis relatively large, bent back in a sigmoid 
form, flattened, broadest in the middle, tapering. 
Cncini, linear, very acute, relatively large, long, slender, curved, 
with a short ovate basal appendage ; length of uncini, •052 mm ; 
breadth, •0032 ,n,n . 
A rather large male is long; breadth, 5*25' nra ; length of 
body-whorl, 7""" ; its breadth, 5""" ; length of aperture, 5 mm ; its 
breadth, 2 l,,,n . An ordinary specimen, measures, in length, 10"""; 
breadth, 4 , 5" ,m ; length of aperture, 5*5' nm . 
This species is common and widely distributed on this coast. It 
ranges from the region south of Martha’s Vineyard, in deep water, to 
Labrador. By the l r . S. Fish Com. it was dredged, off Newport, 
R. 1., and Martha’s Vineyard, in 252 to 487 fathoms (stations 880, 
892, 947,994, 1038), 1880 and J 88 1 ; Cape Cod Bay and off Cape 
Cod, 25 to 122 fathoms, 1x79; Massachusetts Bay, 20 to 2!) fathoms, 
1877 ; (lull’ of Maine, many stations, 25 to 88 fathoms, 1873, 1874, 
1878; 150 fathoms, 1872 ; Casco Bay, 1873; George’s Bank, 5o to 05 
fathoms, 1872; south of George’* Bank, 430 fathoms, 1872; Halifax 
harbor, 16 to 2 1 fathoms, and olf Halifax, 42 fathoms, 1877. 
The specimens front Labrador were sent as />. ixarata , by Dr. A. 
S. Packard, .Jr. 
This shell is closely allied to Itrla exarata, and may ultimately 
