330 Proceedings of Royal Society of Edinburgh. [sess. 
shells undoubtedly are specifically the same as the common edible 
mussel.” Dali ( Bull . U.S. Nat. Mils., 1876, iii. p. 41), with whom 
Smith differs, says, in assigning the Kerguelen form to M. canali- 
culus , Hanley, that “the shell of this species closely resembles 
some varieties of M. edulis , hut the soft parts are quite different.” 
It is plain that the allied forms or species from Chili, New Zea- 
land, etc., are very similar. 
Glomus nitens, Jeff. — Recorded in deep water from various 
stations in the North Atlantic, and also from 1900 fathoms off the 
Rio de la Plata (E. A. Smith, Chall. Rep., Lamellibranchiata, p. 
248). There are several closely-allied species of these little shells 
in the West Indian region. 
Kellia suborbicularis , Mont. — A European species found also in 
the Canary Islands, and of wdiich two specimens are recorded 
(Smith, l.c., p. 201) from Kerguelen. “One of them exhibited a 
very trifling difference in the hinge- plate, which was not, however, 
maintained by the second example.” Three other minute species 
are recorded from Kerguelen, besides others from the Australian 
region, the Straits of Magellan, etc. 
Puncturella noacliina, (L.). — This small Fissurellid is recorded in 
one variety, v. princeps, Migh, from several stations near Marion 
Island, and in another, v. galeata, Gould, from the Straits of 
Magellan. Mr Watson says that he has found it impossible to sepa- 
rate the southern form, which is unquestionably the P. princeps, 
from the species of Linne. He further groups together a number of 
species or varieties, giving to the unified form a distribution includ- 
ing North Greenland, Spitzbergen, Sea of Okhotsk, Northern 
Japan, Oregon, Straits of Magellan, and the Falkland Islands. 
Of the few other, not dissimilar, species, some are from the 
North Atlantic, several from the West Indies, and one from the 
Australian region. 
Trochus (. Margarita ) infundibulum, Watson. — Recorded by the 
“Challenger” from 1375 fathoms off Marion Island, and 1075 
fathoms off Bermuda. The species, which belongs to a group of 
many similar forms, is said to he very like T. ottoi , Phil., a form 
found fossil at Messina, and identified with the M. regalis, Verrill, 
abundant off the New England coast. 
Dentalium keras, Watson. — Dredged by the “Challenger” in 
