AUSTRALIAN MALACOSTRACA. 199 



as long as the peduncles of the antennules, curved slightly 

 upwards towards the acute extremity, armed with 10-12 teeth 

 above and one below. A very strong tooth on the anterior 

 border of the carapace above the insertion of the antennae ; a 

 second, much smaller, between that and the rostrum ; and a 

 third behind the rudimentary cervical suture at the base of the 

 first. Base of the legs of the two first pairs armed with strong 

 spines. Telson with three spines on each side. Length some- 

 times upwards of 6 in. 



Common on the coast of Australia. Found also in Celebes, 

 at Shanghai, Yokohama, the Loyalty Islands, the Grulf of 

 Suez, etc. 



371. Penseus semisulcatus. 



Penceus semisulcatus, De Haan, Faun. Japon., Crust., p. 191, 

 pi. xlvi., fig. 1 (1849) ; Miers, 1. c, p. 299. 



A dorsal carina extending to the posterior margin, faintly 

 or obsoletely sulcated. Grastro-hepatic sulcus faintly defined. 

 Rostrum long, 7-8-toothed above, 3-toothed below. First pair 

 of legs bispinose, second pair unispinose, third unarmed at the 

 base. 



Northern parts of the Australian coast. Found also on the 

 coasts of India, Formosa, the Philippines, and Fiji. 



372. Penaeus monodon. 



Penceus monodon, Fabr., Suppl., p. 408 ; Latr., Hist. Nat. des 

 An. et Ins., t. vi., p. 219 ; Lamarck, Hist, des An. sans Vert., 

 t. v., p. 205 ; Desmarest, Consid., p. 22.3 ; Milne- Edwards, Hist. 

 Nat. Crust, t. ii., p. 416 ; Miers, 1. c, p. 307. 



A short dorsal carina, without sulci, and not reaching to the 

 posterior extremity of the carapace. Gastro-hepatic sulcus deep. 

 Rostrum with G-7 teeth above those toward the apex separated 

 by greater intervals than exist between those of P. semisulcatus ; 

 with 3 teeth below ; not reaching beyond the antennal scale. 

 Telson acute. 



"Western Australia. Found also in Ceylon. 



