Mr. A. Adams on the Species ofH-diddidd 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, 3^ inches long. 



Exocoetus 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 is 

 more than one-third of the length of the head. Pectoral fin 

 extending beyond the root of the caudal. Eoot 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 

 uniform white, black at the base ; ventrals deep black ; caudal 

 white. 



One specimen, 2 inches long. 



LIV. — On the Species o/'Helicidse found in Japan. 

 By Aethur Adams, F.L.S. 



The 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. Sc. 

 1865) has described two species of Helix [H. Blakeana and 

 H. declivis) and one species of Svx^cinea {S. Japonica) which 

 I have not seen. Von Martens has made mention of Helix 

 {j^gista) Friedeliana and Stenogyra ( Opeas) javanica^ B,ve. ; 

 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) Machensii, Val., 

 at Cone Island, and specimens of Helix {Plectotropis) ciliosa. 



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