Mr. A. Adams on the Species of Helicidee found in Japan. 459 
last dorsal ray connected by membrane with the root of the 
caudal. Canine teeth none. 
Dark blackish olive, with scarcely a trace of lighter or darker 
bands on the body. Dorsal fin with very indistinct whitish 
oblique lines; anal fin with a broad black margin. 
A single specimen, 34 inches long. 
Exocetus melanopus. 
D. 14.° A. 13. 
Mandible with a long black band-like appendage, bifid at 
the end and nearly extending to the end of the head. The 
height of the body is one-fourth of the total length (without 
caudal); the length of the head is contained thrice and three- 
fourths in it. Head nearly as deep as long, broad in its nuchal 
portion, and compressed in the rostral; snout obtuse and very 
short, one-half the length of the diameter of the eye, which 1s 
more than one-third of the length of the head. Pectoral fin 
extending beyond the root of the caudal. Root of the ventrals 
nearer to the end of the snout than to the base of the caudal; 
and they extend somewhat beyond the origin of the anal. The 
dorsal fin commences nearly opposite to the first anal ray. 
Trunk and tail with three blackish cross bands, the first cor- 
responding to the space between ventrals and anal; pectoral 
ia white, black at the base; ventrals deep black ; caudal 
white. | 
One specimen, 2 inches long. 
LIV.—On the Species of Helicide found in Japan. 
By Artuur ApAms, F.L.S. 
TuxE following systematic list of inoperculate Pulmonifera 
which live upon the land contains notices of species collected 
by myself in Japan. It is doubtless very imperfect, because 
the interior of these beautiful islands has never yet been ex- 
plored by naturalists. Newcombe (Proc. Cal. Acad. Nat. Se. 
1865) has described two species of Helix (H. Blakeana and 
HT, declivis) and one species of Succinea (8. japonica) which 
I have not seen. Von Martens has made mention of Helix 
(digista) Friedeliana and Stenogyra (Opeas) javanica, Rve. ; 
but I am not acquainted with either of these species. Opeas 
juncea of Gould has also been said to inhabit Japan; but I 
: _ believe my Opeas pyrgula has been mistaken for that species. 
I obtained examples of Helix (Plectotropis) Mackensit, Val., 
at Cone Island, and specimens of Helix (Plectotropis) ciliosa, 
, 32* 
