1876.] NATURAL SCIENCES OF PHILADELPHIA. 185 
whose upper and lower edges are abruptly truncated. The reflec- 
tion is near the base, and consists of a very small, inner cusp, 
bearing a small conical cutting point, and another, outer, larger 
cusp, bearing an extraordinarily developed, wide, expanding, 
bluntly truncated cutting point. As the teeth pass outwards 
towards the outer margin of the membrane, they at first increase 
and then decrease in size, but retain the same shape quite to the 
edge. 
An outer lateral tooth is figured in c, an inner lateral in 0. 
Fig. £, of plate VI., gives a view of the lower surface of the 
animal and also one of the head, showing the short, stout eye 
peduncles and curious oral appendages. 
The Onchidiide are described as agnathous, but I am confident 
of having observed the jaw figured. 
Ariolimax Columbianus, Gld. 
From Mr. O. B. Johnson, of Forest Grove, Oregon, I have 
received specimens of this species. On examining the genitalia, 
I find them to agree perfectly with what I have already figured in 
Proc. Acad. Nat. Sci. of Phila., 1874, pl. XI., fig.c. I am con- 
vinced, therefore, of the identity of the specimens there figured, of 
which some doubt then existed. 
Binneya notabilis, W. G. B. 
Sta. Barbara Island, California, Mr. Henry Hemphill. 
Pl. VI., fig. v, represents almost the whole of the genital system. 
The penis sac is long, narrow, tapering at its apex, where it receives 
the vas deferens: the retractor muscle is inserted below the 
entrance of the latter. The genital bladder is oval, on a long, 
narrow duct. There is a small, saclike, accessory organ, probably 
a dart sac. 
Carelia bicolor, Jay. 
Dr. W. H. Dall. | 
Through the kindness of Dr. Dall, I have been able to examine 
this species, formerly known as Achatina bicolor. Thus I have 
increased the list of subgenera or groups of Achatinella of Gulick’s 
arrangement, whose jaw and lingual dentition is known, leaving 
still to be examined Newcombia only of the same arrangement. 
It will be seen from my description, that while Carelia (or at 
least this species) differs utterly in jaw and dentition from Gulick’s 
Achatinella s.s., Bulimella, Apex, Partulina, Auriculella, it agrees 
