284 MR. BELL, HORjE CARCINOLOGICE ; 



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 Linnaeus, 

 and certainly that figured under this name by Herbst ; it is the Leucosia crcmiolaris 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, &c. 



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 antice 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. Testa rhomboidali, antice producta, mult6 longiore 

 quam latiore ; brachiis basi utrinque dense tomentosis, lateribus tuberculatis, supra, 

 plerumque lsevibus. 



De Haan, Crust. Japon. p. 132. t. 33. f. 5. 

 Hab. ? Mus. Brit. 



Leucosia longifrons, De Haan. Testa subglobosa, fronte producto, integerrimo ; sinu 

 thoracico antice elliptico, granis non cincto ; brachiis lateribus tuberculatis et granulis 

 paucis ad basin. 



De Haan, Crust. Japon. p. 132. t. 33. f. 4. 



Hab. ? Mus. Brit. 



Leucosia orbicularis, mihi (Tab. XXX. fig. 1). Testa orbiculari, fronte lato, brevis- 



simo, bidentato ; sinu thoracico nullo ; sterno in utroque sexu antice granulato. 

 Hab. ad oras Australia. 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 



