328 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



3mm long. One of the largest, baviug six wliorls, is 8™™ long; 4.5™™ 

 broad; body-whorl, G'"™ long; aperture, 4.5™™ long. 



This is one of the most common and generally distributed species of 

 Bela found on the New England coast. It inhabits both muddy and 

 sandy bottom, and sometimes is found among gravel and rocks. It 

 occurs from the region ofl" Newport, R. I., northward to Labrador, and 

 from very shallow water, in the Bay of Fundy and Casco Bay, to 500 

 fathoms, off Martha's Vineyard. It is very common from Massachusetts 



Bcla concinnula Verrill. 



Bela exaraia {pars) Verrill, Proc. Nat. Mus., iii, p. 3fi6, 1880. 

 Bela concinnula Verrill, Trans. Couu. Acad., v, p. 4(J8, pi. A'^, fig. 15; pi. 57, 

 fig. 11. 



Sheir rather small and delicate, long-ovate, regularly turreted, with 

 about six whorls, which rise almost at right angles from the suture, and 

 have an angular, or squarish, nodulous shoulder, usually distinctly car- 

 inated by a thin, raised, spiral keel, which forms small, but prominent 

 nodules where it crosses the ribs; below the shoulder the whorls are 

 abruptly flattened. The subsutural band is usually little convex, or 

 nearly flat. 



The ribs are numerous (often 20 to 25), regular, nearly straight below 

 the shoulder, separated by concave intervals of equal or greater width; 

 they extend entirely across the upper whorls ; above the shoulder they 

 are slightly' excurved on the subsutural band. Whole surface covered 

 with regular and rather strong, rounded, elevated, revolving cinguli, 

 which cross the ribs and produce on them small, rounded nodes, and 

 give a pretty regularly and strongly cancellated appearance to the 

 whole surface. On the penultimate whorl there are four or five cinguli 

 below the angle. Aperture rather short, narrow-ovate, angulated pos- 

 teriorly; sinus broad and shallow. Canal narrow, a little produced, 

 and slightly curved; columella decidedly sigmoid, its inner edge ex- 

 curved at the end. 



Color of the shell white, or pale greenish white, covered with a thin, 

 pale green epidermis. 



A rather large male is 11.5™™ long; breadth, 5.25™™; length of body- 

 whorl, 7™™; its breadth, 5™™; length of aperture, 5™™; its breadth, 2™™. 

 An ordinary specimen measures, in length, 10™™; breadth, 4.5"'™ ; length 

 of aperture, 5.5™™. 



This species is common and widely distributed on this coast. It 

 ranges from the region south of Martha's Vineyard, in deep Avater, to 

 Labrador. By the U. S. Fish Com. it was dredged, oft" Newport, R. J., 

 and Martha's Vineyard, in 252 to 487 fathoms (stations 880, 892, 947, 

 994, 1038), 1880 and 1881; Cape Cod Bay and oft' Cape Cod, 25 to 123 

 fathoms, 1879; Massachusetts Bay, 20 to 29 ftvthoms, 1877; Gulf of 

 Maine, many stations, 25 to 88 fathoms, 1873, 1874, 1878; 150 fathoms, 

 1872; Casco Bay, 1873; George's Bank, 50 to 05 fathoms, 1872; south 



