140 
MOLLUSCA. 
LiTTORINIDiE. 
Littorina saxatilis, Olivi, Zool. Ad. 1792, p. 172 (not Johnston), s= rudis, 
Mont. Brusina, Chiereghinii Oonchylia, pp. 190-192, 236 & 237. 
Crernnoconchus coniaus, sp. n., Blanford, J. A. S. B. xxxix. pp. 10-12, pi. 3. 
figs. 3-5, Poona, British India. 
Held*, gen. nov. Shell and operculum like Lacuna^ but no epidermis ; a 
narrow chink instead of the umbilical groove j apex flattened; tentacles 
ciliated. Type Lacuna tenella (Jelfr.), Jeffreys, Ann. N. H. (4) vi. p. 76, Medi- 
terranean. 
PLANAXIDiE. 
Diala succincta^ sp. n., A. Adams, Ann. N. II. (4) vi. p. 124, Gulf of Suez. — 
Monoptyyma suturalisy Sow., belongs also to this genus. 
lllSSOlDAS. 
Manzonia, new name proposed by Brusina for a section of Rissoa^ which is 
distinguished by its double peristome ; it comprises the R. zetlandica (Mont.), 
costata (Adams), macandrei (Manzoni), to which is added by Brusina M. 
clathroidcs, sp. n. {Turho clathroidas, Chiereghini’s MS.), from the sediment of 
the Adriatic. Brusina, Chieregh. Conch, p. 201. 
Alvania weinkau^, Schwartz, not identical with zetlandica (Mont.), but 
with dictyophora (Phil.). Weinkauff, Bull. mal. Ital. iii. p. 132. 
Rissoa lancice, Calcara, 1845, = philippiana, Jeffreys, 1856. Allery do 
Monterosato, Bull. mal. Ital. iii. p. 45. 
Rissoa amethystina (Renier, figured in 1807), name substituted for R. 
violacea, Desmarest, 1824, by Brusina, Chieregh. Conch, p. 205. 
Rissoa eximia, Jeffr., Chemnitzia clathrata^ Forb. & Hank, united with it 
by Sars, Bidr. Christ, faun. p. 60. 
Rissoa turgida, sp. n., Jeffreys, Ann. N. H. (4) v. p. 445, Drobak and 
Vallo in Christiania-fjord, from 40 to 100 fathoms. 
Rissoa ahyssicola, Forb., some varieties from the Mediterranean indicated 
by Jeffreys, Ann. N.II. (4) vi. p.76. — R. pthilippiana, var. tessellata (Schwartz), 
Jeffr. ibid. p. 77. 
Rissoa gracilis, sp. n., A. Adams, Ann. N. H. (4) vi. p. 122, Gulf of Suez. 
Corena, gen. nov., with double peritreme and the inner lip furnished poste- 
riorly with a dentiform tubercle. — C. tuber culif era, sp. n., A. Adams, /. c. 
p. 122, Gulf of Suez. Near Onoba. 
Oinyida schlosscriana, sp. n., Brusina, Bull. mal. Ital. iii. p. 9, Palermo. 
Ilyala nilida, concinna, andi pumila, spp. nn., A. Adams, 1. e. p. 123, Gulf of 
Suez ; the last also from Japan. 
Ceratia pyryida, sp. n., A. Adams, 1. c. p. 121, Gulf of Suez. 
Microstelma concinna, sp. n., A. Adams, 1. c. p. 121, Gulf of Suez. 
Hydrobia. E. de Betta, Malacol. Venet. pp. 93, 94, & 127, enumerates four 
species belonging to this genus, which live in the estuaries of Venice, viz. 
conoidea, Reynier, stagnalis, Raster, thermalis, Linn<S, and ventrosa, Montagu ; 
it is probable that they all belong to one species. lie is also wrong in asso- 
ciating all those species with spiral operculum in the genus Bithynia. 
Preoccupied in Crustacea, 1861. 
