20 ? Mr. W. H. Dall on certain 
Subfamily Luperivz. 
Animal without eyes, without lateral teeth, with a rhachi- 
dian tooth, and erect uncini; muzzle with an entire margin, 
which is extended backward into a tentacle-like filament on 
each side; shell patelliform, with a subspiral nucleus, which 
is generally lost in early life, the permanent tip being erect or 
anteriorly directed. ‘Typical genus Lepeta, Gray. 
Subfamily Lerererrivaz, n. 
Shell and soft parts as in Lepetine, except that it has 
distinct eyes and is provided with true lateral teeth, and also 
with scale-shaped uncini. Typical genus Lepetella, Verrill. 
Genus LEPETELLA, Verrill. 
Lepetella, Verrill, Am. Journ. Sci. xx. p. 396 (Nov. 1880). 
Type Lepetella tubicola, Verrill, 1. c., also Proc. U.S. Nat. 
Mus. iii. p. 875 (1881). 
Habitat. In two to four hundred fathoms off the 8.E. coast 
of New England (stations 869 and 894, U.S. Fish Commis- 
sion, 1880) in old tubes of Hyalinecia artifex, V. (Coast of 
Norway, in deep water, Sars ?) 
Professor Verrill has well described this little shell in the 
articles referred to, as well as its dentition, which he calls 
Teenioglossate. It is indeed so in one sense, though not in 
the technical sense of belonging to the order Tenioglossa, 
which has a formula = while the formula of Lepetella is 
mm 5 , the essential difference being that all Tzenioglossa have 
on each side of the rhachidian tooth three laterals and no 
uncini, while Lepetella has two laterals and an uncinus. 
The specimens examined by me were dry, or from deteri- 
oration of the alcohol had become quite soft; and, for this 
reason perhaps, I could not detect the eyes seen by Professor 
Verrill so distinctly in the fresh and living animal*. So far 
~as the external features could be determined, there was no 
difference between them and those exhibited by Lepeta or 
Cryptobranchia. The dentition is remarkable, both in rela- 
tive number of teeth and in presenting the only instance of a 
well-developed distinct scale-like (chitinoid) uncinus yet 
known in the order. In fact, the radula has throughout dis- 
* [ have, however, no doubt of their existence. A letter from Dr. J. 
Gwyn Jetlreys states that a small limpet like Lepeta, but with eyes, has 
been dredged off the coast of Norway by Prof. G. O. Sars, which may 
probably prove to be Lepetella. ; 
