MOLLUSCA. 
261 
Californian, wliicli has a thin smooth operculum, and for which A. Adams 
and the author propose the name Lcpto7iyx, leaving the name of Collonia (Gray) 
to tertiaiy shells, like Delphimda maj-ginata (Lam,). — L. (sanguineits, var.) 
pmpurem, sp. n.. Carpenter, ibid., California. 
Liotia fenestrata and acuticostata, sp. n., Carpenter, L c. pp. 158 & 169, Ca- 
lifornia. 
Cyclostrema (Marryat). This genus is re-established by Mr. .Jeffreys, Brit. 
Conchol. iii. p. 286, comprising the British species Skenca cutleriana (Clark), 
DclpTiinula nitens (Phil.) = Trochus piisilhts (Forbes & Hanley), and the 
typical species Helix scrptdoides (Montagu) = Skenca divisa (Fleming, Forbes 
& Hanley). The characters of the shell are : orbicular, white or of a uni- 
form colour ; spire more or less depressed, of few whorls j mouth nearly cir- 
cular, with a free and coiitinuous peristome ; umbilicus distinct and deep. 
It coiresponds to Dclphinoidea, Brown, as proposed in A. & II. Adams’s 
Gen. i. p. 400, but afterwards reunited by them with Vitrinella, ii. p, 629. 
A monograph of this genus by A. Adams is contained in Sowerby’s ^ The- 
saurus,’ pp. 219-254, pi. 255. He describes and figures sixteen species, beside 
two of the subgenus Daronia^ A, Ad. CSerpnlaria, Adams, Gen. p. 400), which 
somewhat resembles Sph'ida in its discoidal growth and rather disunited 
whorls ; three of the subgenus Tuhiola (A. Ad,), one of Microtheca (A. Ad.), 
and one of Morcliia (A. Ad.). The last three subgenera have the whorls 
rounded and not quite discoidal, the spire being somewhat elevated. Tti- 
hiola (type Ihirho niveus, Chemnitz) is concentrically striated ; Microtheca 
(Isanda, A. Adams, Ann. & Mag. Nat. Hist. 1862) radiately plicate, with 
channelled suture and a wide umbilicus ; Morchia almost smooth, the whorls 
rapidly increasing, the last ascending and embracing the other whorls as far 
as the apex. The subgenus Tuhiola embraces the only European and Bri- 
tish species, Tuvho divism (I. Adams). All the species are uniformly white 
and without pearly nacre. Nothing is known of the anatomical characters 
or even the outer features of the living animal, or of the operculum ; most 
are known from dead specimens only picked up in the sand. The figures 
are not sufficiently magnified, and therefore cannot give a good idea of the 
particularities of sculpture, which is so important a character in this genus. 
New species are Cyclostrema tornata A. Ad., p. 251, figs. 19 & 20, and {Ida- 
ronia) cyclolina, A. Ad., p. 253, fig. 34, both from Japan. For the first time 
figured, though previously described, are Cyclostrema angidata, A. Ad., 
figs. 1 & 2, micans, A. Ad., figs. 7, 8, Sz 27, stdeata, A. Ad., figs. 11 & 12, 
cmgulifera, A. Ad., figs. 13 & 14, ammonoceras, A. Ad., figs. 21 & 22, ana- 
glypta, A. Ad., figs. 28 8z 29, hiporcata, A. Ad., figs. 30 & 31, (Daronia) spi- 
rula, A. Ad., figs. 32 & 33, {Tuhiola) cornuella, A. Ad., figs. 37 & 38, {Mi- 
crothcca) crencllifera^ A. Ad., figs. 41 & 42, and {Morchia) ohvoltda, A. Ad., 
figs. 43 & 44, all from Jnpan or the Philippines, some from both localities j 
finally, Cyclostrema cxcavata, Carp., figs. 15 Sz 16, from the China seas. 
Adeorhis (S. Wood). Mr. A. Adams’s monograph in Sowerby’s ^The- 
saurus,’ pp. 264-268, pi. 256, contains twenty-one species, one European and 
British, A. suhearinatus (Walker), two from the "V^^est Indies, one from 
Australia, the rest from the I’hilippines or .Japan. The following appear to be 
figured for the first time : — A. clegans, A. Ad., figs. 1 & 2, St. Thomas j plana, 
A. Ad. figs. 3 & i:,planorhula, A. Ad., figs. 5&6, nitida, A. Ad., figs. 9 & 10, tro- 
chula, A. Ad., figs. 12 & 13, depressa, A. Ad., figs. 14 & 15, orhella, A. Ad., 
