ii8 



the following teeth become still smaller; the sliohtly curved, anterior or 5'^ tooth reaches as 

 far forvvard as the pointed tip of the rostrum, that jiist projects beyond the tooth at the end 

 of the lower margin. 



There are two teeth on the dorsal carina of the carapace and these teeth are also low; 

 the tip of the posterior tooth is placed at the posterior third of the carapace, the tip of the 

 anterior or gastric tooth just in front of the middle and as far distant from the tip of the 

 posterior tooth as from that of the P' rostral tooth; the i^' tooth of the rostrum is one and 

 a half times as far distant from the gastric tooth as from the 2"<ï rostral tooth. In the middle 

 of the rostrum the lateral carina is situated somewhat more than twice as far from the tips of 

 the teeth as from the lower margin ; the lateral surface of the rostrum carries, on its distal 

 half, between the lower margin and the lateral crest two or three larger and several smaller, 

 spiniform setae. 



Orbital angle obtuse, hepatic spine small. The branchiostegal groove is distinct as a 

 transverse furrow beneath the hepatic spine, running from this spine to the level of the middle 

 of the anterior or gastric tooth of the carapace. An arcuate furrow or depression extends 

 towards the posterior extremity of the gastric tooth, defining the gastric region. 



The carina of the i^' abdominal tergum is produced into a small tooth, but that of the 

 2°'! is obtuse at its anterior extremity. The longitudinal ridges on the posterior part of the 

 three first abdominal terga are conspicuous, but on the three posterior they are indistinct. The 

 pleura of the i^' somite bear no transverse groove on their anterior portion; those of the 5"^ 

 and of the 6* are armed with an acute tooth at their postero-inferior angle. 



Eyes shorter than the rostrum. The antennular peduncle reaches just beyond the truncate 

 tip of the antennal scales; stylocerite .slender, hardly reaching beyond the eye-peduncles. The 

 acute tooth at the far end of the outer margin of i^' article reaches almost to the middle of 

 the 2"^ article. Flagella twice as long as the 3'''^ article and as long as the 2"'^. 



External maxillipeds reaching as far as the antennal scales. 



The legs of the i^' pair are bispinose, fingers a little longer than the palm; the fingers 

 of the 2""^ pair are as long as the palm and those of the 3"^ are a little shorter than it. The 

 chelae of the 3"^ legs are little more than half as long as the slender carpus, which is 1 6-times 

 as long as thick. The legs of the 5''' pair reach almost to the end of the antennal peduncle; 

 their carpus is just as long as the two last joints combined and their dactylus measures three- 

 fifths the propodus. 



As regards the young specimen from Stat. 273, I will only remark that the rostrum is 

 just as broad at the level of the penultimate tooth of the upper margin as at the base. 



General distribution: Japan (de Haan). 



1 54. Sicyonia laevis Sp. Bate. 



Sicyonia laevis C. Spence Bate, Report Challenger Macrura, 1888, p. 298, PI. XLIII, Fig. 5. 



Stat. 184. September 11/12. Anchorage off Kanipong Kelang, South coast of Manipa-island. 

 36 m. Coral, sand. i young female. 



118 



