MOLLtlSCA. 
579 
Thalassophila. 
Amphtbolim. 
Ampliihola hurmana, sp. ii., Blanford, Journ. As. Soc. ii. p. 66, pi. 2. figs. 
7-10. Very common in the delta of the Irawady, crawling on mud, between 
tidemarks, in company with Assiminm rubella and Plecotrema cumingianum. 
Shell allied to A. fragilis (Q. & G.), animal considerably differing from 
the figure given by Quoy & Qaimard. Specimens of the same species from 
Malacca and Bombay were seen by the author, 
SiPHONARIIDiE. 
Siphonaria sipho (Sow.), including ns varieties extgua (Sow.), and acuta, 
albicans, punctata, zelandica, midiplicata (Q. Sz G.) is described from specimens 
from Hakodate by Schrenck, 1. c. pp. 306-308. 
Siphonaria alternata (Say), from Florida, a>quilirata (Carp.), amara (Reeve), 
and lecanium (Phil.), from California and Mazatlan, briefly described, and the 
first three figured by Binney, Land- and Freshwater Moll, of N. Amer. pt. 1. 
pp. 153-154. 
PULMONATA OPEPCULATA. 
« 
CyclotAcea. 
The subfamily Cyclotacea, comprising Cyclotus and Cyclo- 
phorus, is characterized by the round multispiral operculum 
with central nucleus, and the lohed, hut not pectinated, laminne 
of the radula. It is chiefly represented in Eastern Asia ; and 
the genera and suhgenera occurring in the Asiatic fauna are 
arranged in a double manner first, according to the aperture 
of the shell being simple or expanded or provided with wing- 
like prolongations ; secondly, according to the structure of the 
operculum, The radula of Cyclopliorus punctatus, tuba, borne- 
ensis, and Cyclotus subflammulatus figured in woodcuts. Martens, 
Preuss. Exped. ZooL ii. pp. 108-110. 
Opisthop)orns euryomplialus (Pfr.) = Cyclotus latistrigus (Martens), Borneo, 
Martens, 1. c. pi. 1. fig. 6 j corniculum (Mouss. as Cyclostoma) —jamnm (Pfr.), 
1. c. p. 112 ; sumatranus (Martens), 1. c. pi. 1. fig. 4, 
rtcrocyclos sumatranus (Martens), I c. p. 115, pi. 1. fig. 6. 
Coelopoma, g. n., A. Adams. Peristome simple; operculum elevated, coni- 
cal, hollow, with a horny spiral lamina. C. Japonicttm, sp. n., Tsusima, Japan. 
A. Adams, Proc. Zool. Soc. 1867, p. 313, pi. 19. fig. 29. 
Cyclotus. The Asiatic species have the edge of the operculum rather 
thick, and provided with a circular furrow. They are arranged by the Re- 
corder in the following groups (Preuss. Exped. pp. 116-129) : — 
1. Pterocycloidei, aperture as in Ptci'ocyclos : C. bafjanensis (Pfr.), pi. 1. 
fig. 1, hernsteini (Martens), p. 117, Obi Islands; pruinosus (Martens), 
fig. 2, Ternate ; fasciatus (Martens), fig. 3, Maros, Celebes. 
2. Marmorati: gtiUatus {Vh}^ — suhjlamnmlatus (Pfr.) (Martens), 
1. c. fig. 7, variety 7 h, Moluccas ; reticulatus (Martens), fig. 3, Flores 
and Timor ; amboinensis (Pfr.), figs. 4 & 5, Ceram, Amboina, and 
Bum ; succinctus (Martens), figs. 6 & 7, Timor ; fulminulatus (Mar- 
tens), fig. 1, and lo7igipilus (Martens), fig. 9, both from Maros, Celebes. 
