A. E. T'errill — Catalogue of Marine Mollusca. 
553 
and Grand Menan, but it is usually an inhabitant of rather deep 
water, on rocky bottoms. We have dredged it at many localities 
from off Fisher’s Island and Block Island to Halifax, N. S., in 20 to 
90 fathoms, among hydroids. It is the most common species at such 
depths. 
Two or three related species of Corgphella, not yet characterized, 
are known to us, from the New England coast. 
Cratena Veronicae Terrill. 
CratenaVeroniccR T’errill, Proc. U. S. Nat. AIus., iii. p. 389, 1880. 
Off Cape Cod (stations 307, 328, 329, 331, 333), iu 23 to 31 fath- 
oms, among hydroids, September, 1879. 
G-alvinia exigua Alder and Hancock. 
AJolis despectus (pars) Gould, ed. II, p. 248, pi. 16, figs. 222-225. 
Salem and Boston, Mass., at low-water. 
The genuine Tergipes despectus was first distinguished from G. 
exigua by Mr. J. II. Emerton, at Salem, Mass., in 1879: The species 
figured by Gould (Binnev’s edition) as despectus , is really the Gal- 
vinia exigua Alder & Hancock, differing widely iu its dentition, 
there being three rows of teeth, instead of the single row, seen in 
Tergipes. But the T. despectus of my Report on Invertebrates of 
Vineyard Sound, 1873, was correctly named. Both species are found 
under the same conditions, on Obeli a , etc., but, according to Mr. 
Emerton, G. exigua is found in the spring and early summer, while 
T. despectus occurs later in the summer and in autumn. G. exigua 
has not yet been found south of Cape Cod. 
PTEROPODA. 
Cymbulia calceolus T'errill. 
Cymbulia calceolus Terrill, Amer. Journ. Sei., xx, pp. 392, 394, Nov., 1880; Proc. 
U. S. Nat. Mus.. iii, p. 393, 1880. 
Plate LVIII, figure 33. 
The depth from which the specimens that were caught in the 
trawl came is uncertain, but as specimens have often been found in 
the stomachs of actiniae, starfishes, etc., it doubtless inhabits all depths, 
to the bottom. It grows to a very large size. Some of the living 
specimens were more than 3 inches across the wings, which are over 
one inch wide, and very delicate. 
