150 
MOLLUSOA. 
Nanina (subgen. Microcystis') futunaensis^ sp. n., and N. (M.) perpolita 
(Mouss.), var. solula, Mousson, J. de Conch, xix.^pp. 7 & 8, the first figured 
pi. 3. fig. 1, Tonga I. 
Nanina {Trochonaiiina) tongana (Quoy). Full-grown specimens have a cal- 
losity on the columellar margin : id. ibid. p. 9. 
Conulema, g. n. Shell conoid, thin, consisting of many whorls, 
usually spirally ribhed or striated ; base convex, narrowly or 
indistinctly umbilicated ; margin of aperture thin, not expanded, 
outer margin simple. Animal narrow, long; gland at the end of 
the foot, beneath a distinct horn ; two shell- and two dorsal lobes 
on the mantle, all of them small and with no separately produced 
appendages. Jaw thin, smooth, indistinctly concentrically 
striated in the middle, &c. To this genus belong Helix attegia, 
infula, cacummiferay arx, and palmira (Bens.), gratulator and 
confinis (Blf.), and liricinctaj sp. n., from Moulmein. Stoliczka, 
1. c. pp. 236-241, pi. 18. figs. 1-10. 
Rotula (Albers). Type Helix detecta (Fer.). The soft parts 
of R. anceps (Gould) are described, and the spp. referable to this 
genus discussed : id. ibid. pp. 231-235, pi. 17. figs. 1-3. 
Sophina (Bens.) . Its conchological and anatomical characters 
pointed out. Foot long, obliquely truncate at its hinder end, 
with a large gland and distinct horn-like appendage ; mantle- 
lobes as large as in Helicarion ; arrow-sac with an enclosed, thick, 
pointed papilla; vas deferens with a long pointed appendage, 
provided with a peculiar muscle ; jaw finely concentrically striate. 
S. calias {^eYi^.)=^schistostelis (Bens.), forabilis (Bens.), dis~ 
coidaliSy and conjungens, spp. nn., all from Moulmein. Id. ibid. 
pp. 252-259, pi. 19. 
Sesa^'a (Albers) is to be distinguished from the other Zonitidce 
by the thickened columellar lip and toothed aperture ; lobes of 
the mantle small ; the receptaculum seminis is a long thin 
twisted sac, containing several horny curved tubes [spermato- 
phores] ; jaw smooth, finely radiato-striate on the inner side, 
with, an obtuse middle projection. S. infrendens (Gould) =ca- 
pessens (Bens.), and pylaica (Bens.) are more particularly de- 
scribed. Id. ibid. pp. 240-245, pi. 16. figs. 4-10. 
Helicopsis (Beck, 1837, nec Fitzinger, 1833) has a glandular 
opening at the end of the foot ; the mantle is wholly included 
within the shell. Pease, P. Z. S. 1871, p. 455. 
Trochomorpha trochiformis (F^r.), var. n. pollens, Moovea Island ; niyri- 
tella (Pfi*.), var. n. oppressa, Ponape I. ; and congrua (Pease, 1868, preoccu- 
pied), renamed contigua : id. ibid. p. 466, and J. de Conch, xviii. pp. 398- 
400. 
Helix (Trochomoipha) fessonia (Angas, \QQ&)=transarata (Mouss., 1870): 
Brazier, P.Z.S. 1871, p. 322. 
['rrochomorpha'] Helix helmorii, Cox, P. Z. S. 1871, p. 647, pi. 62. fig. 12, 
