312 A. E. Verrill— Marine Fauna of North America. 
re 
pe ae 
white in color, and has a smooth base. It somewhat resembles — 
a minute Scalaria. The six whorls are well-rounded, with deep 
sutures ; iy last whorl has four or five cee revolving ridges, 
around the middle, but none on the ; the numerous and 
regular subenthral ribs cross two or more vot the revolving ridges. 
The aperture is slightly angular and effuse in front, or some- 
times even slightly notched. The inner lip is scarcely contin- 
uous a afc ete f or represented only by a very thin deposit on 
the body-w no umbilicus. n examination of the soft 
parts and of the ‘dentition shows that this is a genuine fissoa, 
(as understood by Jeffreys and others, in the wider sense). 
ut it seems to me better to adopt the name Cingula, as re- 
stricted by Gould, in 1841, for those a garg mostly northern, 
which lack the opereular cirrus, an ich, also, usually have 
thin shells, with no distinct rib on te outer lip. To this group 
belong nearly all our other New England species, viz: C. aculeus 
Gld., C. multalineata (St.), @. castanea 7 (MIL. Lu aes M. (= 
exarata St. ), @G carinata M., C. latior M., C. globulus (Moll. 
No true fissoa has yet been found on the Northeastern coast of 
America. 
Cingula castanea nob., (= Rissoa castanea Miller). : 
This species I have dredged at Eastport, Me. (1864). Pro- 
fessor Cleveland took it at Mt. Desert, Me. ; and Mr. W hiteaves 
in the Gulf of St. Lawrence. It is sometimes white. 
Acirsa costulata nob., (= Turritella costulata Mighels, 1841). 
The species, very well described and figured by Mighels, is 
undoubtedly identical with A. borealis Beck, MSS., and A. E- 
chricht: (MOll. 1842) of authors. The name given by Mighels 
appears to have priority of publication. It is not uncommon 
off the coast of Maine, in 10 to 90 fathoms. 
Leptochiton alveolus (Sars) Lovén. 
Mr. W. H. Dall has detected this species among ae 
dredged in the Gulf of Maine, in 150 fathoms, by Dr. S. 
Packard, for the U.S. Fish Commission, on the “Bache,” in 
1872. He also informs me that he has received it from the | 
Gulf of St. Lawrence, 220 fath., (Coll. Whiteaves). 
Leptochiton cancellatus (Sby.) H. & A. Adams. 
Mr. Dall has se ete as probably of this species, an imma- 
ture specimen dredged by me, in 1877, off Halifax, N.S., 0 
95 fath., while on ou U. S. Fish Commission: 
Doris repanila Alder and Hancock, (=D. planulata Stimpson). 
A critical examination of the dentition of this species < 
that se American specimens are perfectly identical with 
European. 
