MOLLUSCA. 
641 
Alcithoe thatclieri (M'Coy) comes from the Bampton Beef, near the north- 
west coast of Now Caledonia. Brazier, 1. c, p. 5G1 ; its spire described by 
M'Ooy, Ann. <&Mag. Nat. Hist. iv. p. 140. 
[Fulfforana] Valuta liamillei, sp. n., Crosse, Journ. Conch, xvii. p. 278, 
Solomon Islands. Allied to V. rupcstris (Gmel.). 
\^Cymhiola'] Valuta ancilla (Solander). Variations in the number of the 
pillar-plaits. Martens, Mai. Blatt. xvi. p. 220. 
MlTllID^. 
Prof. Troschel establishes a distinct family, Strigatellacea, 
for a number of shells placed formerly in the genus MUra, on 
account of the median plate of the radula being broad and pec- 
tinated, and the lateral plates being provided with a single hook. 
He admits two genera, Strigatdla (Swains.) and Turricula 
(Swains.), to this family, and describes and figures the radula of 
the following ^p^ci^^'.—Strigatella woldemarii, solidula, Turri- 
cula corrugcLta, melongena, plicaria, and exasperata. Gebiss der 
Schncckcn, pp. 102-i04, pi. 9. figs. 11-16. 
Tho dentitions of a true Mitra and of a Castcllarta aro figured by Mac- 
donald, Ann. & Mag. Nat. Hist. iii. p. 110, pi. 13. figs. 7 & 17. 
Mitra harldyana, sp. n., Robillard, Trans. R. Soc. Sc. & Arts Maurit. iii. 
p. 100, with plate. Appears to be a variety of M. fulva. 
Mitra desetangsii (Kien.), nearly allied to variegata (Reeve) ; the colour 
of the fresh shell described. Kiener’s specimens were not fresh. Lienard, 
Journ. Conch, xvii. p. 220. 
Mitra ncwcamhi, sp. n.. Pease, Am. .Journ. Conch, v. p. CO, Oahu; M. 
cricea (Pease) = (Reeve), Pease, ibid. p. 86 ; M. glabra (Pease), tho 
name changed to luhrica by Pease, the former name being preoccupied, ibid. — 
Mitra williamsi, sp. n., Newcomb, Am. Journ. Conch, v. p. 103, pi. 17. f. 1, 
from the Philippine Islands (?). 
[^Costellaria'] Mitra pharaonis, sp. n., described by Issel, Malac. mar. ross. 
p. 119, pi. 3. fig. 9, Red Sea. 
\_Costellaria^ Mitra plicatula (Brocchi, as fossil), perhaps identical with a 
recent shell from Tunis. Petit, Catal. Moll. Eur. p. 281. 
Mauritia, gen. nov. Coliimellar folds numerous, but less distinct than in 
Mitra ; general appearance of Dihapims. M. harclayi, sp. n., II. Adams, Proc. 
Zool. Soc. 1809, p. 273, pi. 19. fig. 6, Mauritius. 
COLUMBELLIDAS. 
Prof. Troschel characterizes the family of " Columhellacea ” 
by the median plate of the radula being narrow and not denti- 
culated, and the lateral plates being provided with two hooks, 
which are placed on the margin of the plate. These lateral 
])bitcs arc only fixed on one of their sides. He describes and 
figures the radula of the following subgcnera and species : — 
Colmnbella mercatoria, rustica, punctata^ Nitidella nitida, Alia 
unicolor, Pyrene semipunctata, Mitrella scripta, Astyris rosacea, 
Anachis rugosa, and Strombina gibberula, and thinks that they 
