FROM THE INLAND SEA OF JAPAN. 451 



which stands at the base of the rostrum, is much smaller tlian the two preceding on the 

 upper border of the carapace and than the corresponding tooth in the Mediterranean 

 specimen. Tlie straight npper border of the rostrum is armed with three teeth of equal 

 size, of which the third or anterior, placed immediately behind the acute tip, is, in the 

 larger female a little farther from the second than the second from the first, whereas 

 in the two other specimens the second is a little farther from the first than from the 

 third. 



The straight lower margin of the rostrum ends in a sharp tooth, and, exactly as in the 

 specimen fr 0711 Ilessma, there are between this tooth and the tip, which is ciu'ved down- 

 ward, nearer to the tip than to the tooth, two other pointed teeth which are also curved 

 downward. According to Milne-Edwards the lower margin should carry only one tooth, 

 according to Heller one or two, according to Sj)ence Bate also one ; Spence Bate is here, 

 however, inaccurate, for he figm-es (1. c. fig. 1") two teeth below the tip. In the sjiecimeu 

 from Messina, as well as in those that loere captured off Bahia, there are six teeth 

 betioeeii the tip of the rostrwm and the posterior margin of the carapace and three 

 teeth beloio the tip. 



The abdomen agrees with that of the specimen from Messina, but the grooves, both 

 the transverse and the oblique, are in the American specimens much less deep and 

 shallower. 



The third difference which I observe is presented by the first three pairs of legs, which 

 in the specimens caught off Bahia are a little slenderer. 



If the differences described are, indeed, constant, the American species should form a 

 variety, for which the name americana is proposed. 



SiCYONiA CARINATA (Olivier). 

 Sicyonia carinata (Olivier), Spence Bate, Ecport on the ' Challenger ' Macrura, p. SDi, pi. 43. figs. 2, 3. 



Three young specimens, dredged off Bahia, 2^ fathoms. 



The largest specimen is 38 mm. long from tip of rostrnm to the end of the telson. 



These specimens fvilly agree, especially as regards the toothing of the rostrum, with 

 the above cited figures of the ' Challenger ' lleport, the upper border of the rostrum 

 carrying two teeth behind the acute tip and one immediately below it. 



SECOND SERIES. — ZOOLOGy, VOL. IS. 6i 



