654 
ZOOLOGICAL LITEKATURE. 
Neritina (Lam.). Tho operculum of this genua exhibits two processes 
which may be called rib (apophysis costalis) and peg (apophysis cardinalis). 
They are somewhat different in the various sections of the genus : — 
1. Theodoxus (Moutf.) = iV. ovcdes (Menke) = iV. edentul<s (Ji€d\xz)^ViUa 
(Mbrch & Adams), tho European freshwater species. Peg rudimentary. 
2. Mitrulce (Menke, 1830) = N. crepidiformes (E^cluz) =2)os^ia (Gray), 
preferring brackish water. 
3. N. hemisphcericce (Menke) = Ciypeolum (R^cl.) = Neritella (Morch & Ad.), 
in freshwater streams. 
4. N. pictcB (Menke) = sen'atce (R^cl, Clithon (R4cl., 1850) = 
Neritcea (Roi\ 1855) =Pw^mVa (Gray, 1857) = AenVma (Morch & Ad.), 
preferring brackish water. 
In these three sections peg and rib are well developed, and quite separated 
from each other. 
6. N, spinosce (Menke) = (7oro«a (Rdcl.)= (7/iV^ow (Montf., Morch, & Ad.), 
inhabitants of fresh water. Peg and rib connected in half their length. 
6. Neritodryas, new subgenus. Rib deeply furrowed, multilobate at the 
tip, and deeply excavated beneath. N. cornea {lu.) =amphihia (Less.) and 
N. dubia {GhQmia..')—philippinarum (Sow.), both living on damp foliage above 
the water. 
7. Nei'itonay new subgenus. Peg depressed, almost flat, lobate at its tip. 
N. lahiosa (Sow.) in fresh water. This species has also been observed by the 
author in the northern part of Celebes. 
Still more depressed is the peg in the operculum of the genus Nerita, which 
is also generally distinguished by a peculiar sculpture of the outer surface of 
the operculum ; and in that of Navicelluj Lam. ( Catillus, Montf.), vestiges of 
the two processes can be traced, not as elevations, but as flat prolongations, 
into the edge of the operculum. Martens, Sitzimgsberichte Gesellsch. 
naturf. Fr. Berlin, 1869, pp. 21-23. 
Neritina hnorri (R^cluz) = iecA;tV (in Sowerby’s Thesaur. and Reeve’s Con- 
chol. Icon., but not of R(5cluz) = cana/w (Gassies, Moll. Nouv. Caled., not 
of Sow.) comes from Eastern Africa. Martens, Nachrichtsbl. mal. Gesellsch. 
i. p. 154. 
Theodoxus godeffroyanus^ sp. n., Mousson, Journ. Conch, xvii. p. 871, pi. 16. 
fig. 7, Upolu, Samoa Islands. 
Clithon chrysocoUa (Gould) distinguished from Cl. roissyi (R^cluz), and Cl. 
propinquus, sp. n., from Upolu, Mousson, Journ. Conch, xvii. pp. 372,373j the 
latter figured on pi. 15. tig. 8. 
" Ciypeolum petiti (R^cluz), var. samoensis, and Cl. planissimtm, sp. n., from 
Upolu, Mousson, ibid. pp. 377, 378 ; the latter figured on pi. 16. fig. 9. 
Smaragdia is a new genus proposed by Issel for Nerita viridis (L.), the eyes 
being sessile and not stalked j S. feuilleti (Audouin as Neritina), Descript, de 
I’Egypte, pi. 6. fig. 11, described by Issel, Malac, mar. ross. p. 212. [It is 
identical with Neritina rangiana (R^cluz).] 
Navicella haustrum (Reeve), var. Jissa, N. scarahceus, var. decapitata, and 
N. maunifica (Reeve), var. truncata. from Upolu. Mousson, Journ. Conch, 
xvii. pp. 883-886. 
TllOCHIDiE. 
Phasianella hi'ongnartii (Audouin) described by Issel, Malac. mar. ross. 
p. 216. 
