36 NON-MARINE MOLLUSCS OF SURINAM. 
much resemblance between it and Doryssa hohenackeri. It 
is recorded however from the Antilles, and the Leyden 
Museum possesses two specimens from Cuba. 
87. HEMISINUS LINEOLATUS Gray. 
Strombus lineolatus, Gray in Wood, Index Testac., 1828, 
Supplem., f. 44. 
Hemisinus lineolatus Gray, Brot, Syst. Conch. Cab., Ed. nov., 
Band I, Abt. 24, 1874, p. 373, T. 38, f. 6, 6a—e. 
Martens, 1873, p. 216. Surinam. 
PELECYPODA. 
* 88. DIPLODON VOLTZI nov. sp. (figs. 16 a—d). 
Shell somewhat cuneiform in circumference, inflated, 
inaequilateral. Epidermis blackish, concentrically striated, 
and sculptured with small wrinkles. By transparent light 
the colour is greenish. Some small radiating wrinkles visible 
on the area of the left valve, near the ligament. Dorsal 
margin ascending, posterior margin faintly rounded, ventral 
margin rather straight, anterior margin sharply rounded. 
Nacre bluish near the margins, somewhat roseate in the 
centre. Right valve with two cardinal teeth: one strong, 
crenated, the other lamelliform; left valve with one car- 
dinal tooth, longitudinally incised, and crenated on the 
inner surface of its anterior part. One lamella in the right 
valve, two lamellae in the left one, all of them curved. 
Anterior scars deep, separated, posterior scars shallow. 
Length 61; height at the umbones 35, largest 37; thick- 
ness 27 m.M. 
Type in the Leyden Museum. 
Surinam. Voltz. 
The exact locality, where this specimen is collected in 
Surinam is unknown; probably it was in the coast-region. 
The surface of the only specimen is much eroded, so no 
sculpture is perceptible on the umbones and most part of 
the area. 
Dr. F. Haas at Frankfurt a. M. has had the courtesy of 
Notes from the Leyden Museum, Vol. XXXVI. 
