284 MR. BELL, HORÆ CARCINOLOGICÆ ; 
middle tooth being longer than the lateral; the thoracic sinus terminates anteriorly in a 
notch, which reaches upwards to the margin of the carapace between the hepatic and | 
branchial regions. The abdomen is long, lanceolate, and slightly hastate at the base. 
This is one of the two species so often figured and described, and the only ones known 
until within the last few years. It is very probably the Cancer craniolaris of Linnæus, 
and certainly that figured under this name by Herbst; it is the Leucosia craniolaris of 
Fabricius and all subsequent authors. There are several specimens in the British Mu- 
seum, in the Banksian Collection of the Linnean Society, and in my own collection. It 
inhabits the Eastern Seas, being found on the coast of China, &e. 
There are several other species which resemble it in some degree in general form and. 
proportions, but the paucity of tubercles on the arm sufficiently distinguishes it from them 
all, excepting L. rhomboidalis of De Haan, which is certainly very nearly allied to it, but 
differs in the hairy surface of the arms. 
LEUCOSIA OBTUSIFRONS, De Haan. Fronte rotundato; sinu thoracico anticé circulari, 
tuberculis circumscripto; brachiis ad latera et ad basin tuberculatis ; manibus 
longioribus quam latioribus, serie granulorum ad marginem interiorem. 
De Haan, Crust. Japon. p. 133. t. 33. f. 2. 
Hab. ad ins. Japoniam. Mus. Brit. 
LEUCOSIA UNIDENTATA, De Haan. Fronte unidentato; sinu thoracico antice circulari, 
tuberculis perlatis circumscripto ; brachiis facie superiore seriebus binis tuberculorum. 
De Haan, Crust. Japon. p. 133. t. 33. f. 3. 
Hab. Japonia, ins. Moluccenses, &c. Muss. Brit., Bell. 
LEUCOSIA RHOMBOIDALIS, De Haan. Testä rhomboidali, anticè productá, multd longiore 
quam latiore; brachiis basi utrinque dense tomentosis, lateribus tuberculatis, suprà 
plerumque lævibus. 
De Haan, Crust. Japon. p. 132. t. 33. f. 5. 
Hab. ? Mus. Brit. 
LEUCOSIA LONGIFRONS, De Haan. Testä subglobosä, fronte producto, integerrimo; sinu 
thoracico anticé elliptico, granis non eincto ; brachiis lateribus tuberculatis et granulis 
paucis ad basin. 
De Haan, Crust. Japon. p. 132. t. 33. f. 4. 
Hab. ? Mus. Brit. : 
LEUCOMIA ORBIOULAEIS, mihi (Tax. XXX. fic 1). Test orbioulari, fronte lato, levis 
simo, bidentato; sinu thoracico nullo; sterno in utroque sexu antice granulato. 
Hab. ad oras Australis. Muss. Brit., Bell. 
The carapace in this species offers the nearest approach to the orbicular form of any of 
the genus. The front: remarkably broad, scarcely projecting, and slightly bidentate; 
hepatic region not distinct; marginal line nearly smooth anteriorly, the marginal granu- 
lations becoming conspicuous over the branchial region, and continued in an uninterrupted 
