19 



of the pleura of the 2°^^ somite is conspicuously armed with short spiniform teeth, while the 

 tooth or spine at the anterior extremity is somewhat longer than the rest : the 3 following 

 pleura are also denticulate inferiorly and on the lower half of their posterior edge. 



The ventral sidewalls are hairy. The upper longitudinal ridge is spinulose ; in front of 

 the oblicjue groove that corresponds to the cervical sulcus, the spines are larger, though few 

 in number, while behind the cervical groove they are much smaller and much more numerous. 

 The lower ridge is armed with spines along its whole length, which on the anterior third are 

 much smaller than posteriorly. Between the lower ridge and the thoracic legs the ventral 

 sidewall is granular, except on its anterior third, and much finer granules occur between the 

 anterior third of the upper ridge and the buccal frame. 



According to Prof. Alcock's description the outer angle of the basal joint of the antennular 

 peduncle should be armed with two spinelets: in all the specimens, however, lying before me, 

 only one single spine let occurs, except in the young female, long 44 mm., from .Stat. 

 48. Of the two spinelets, e.xisting in this female, the inner is almost twice as long as the outer. 

 The number of spinelets, one or two, at the outer angle, seems therefore to depend upon the 

 age of the specimens, because the type from the Travancore coast was also a young specimen, 

 50 mm. long. In the other examples the single spinelet is slightly directed outward and placed 

 just near the acoustic sulcus. 



In all the specimens the antepenultimate joint of the antennal peduncle is unarmed, 

 except in the young female from Stat. 48 where it bears a small acute tooth, near the distal 

 end of its inner border: the occurrence of this tooth seems to be again a juvenile feature. 

 Both the penultimate and the terminal joint are armed, in all the specimens, with an acute 

 spinule at the far end of their inner border. In the adult specimens the antennal scale reaches 

 as far forward as the antennal peduncle, in the young female it is a little shorter; the antennular 

 scale is barely longer and both terminate in a spiniform extremity. 



Instead of the slender conical tooth existing in Stcrcom. trispinosa^ the frontal wall of 

 the carapace presents, beneath the two frontal teeth, a small, obtuse tubercle that is directed 

 forward, though not upward, so that it is situated rather far below the uj^per surface of the 

 carapace. 



The e.xternal maxillipeds reach as far forward as the antennular peduncle. 



The legs of the i"' pair, which in adult specimens are a little longer than the body, 

 closely resemble those of Sfcrcoiii. pliosphorus. The merus, armed with a claw-like spine at 

 the far end of its upper margin, carries 2 or 3 spines just behind the middle; opposite them 

 the lower margin presents one or two smaller spines and between the latter and the distal end 

 the lower margin is finely spinulose. The car|nis has a slender spine at the far end of its upper 

 border and a shorter one at that of the lower. At the inner distal extremity of the upper 

 border of the palm a slender spine occurs; this upper border is soft to the touch, though one 

 observes on it minute spinules by means of a magnifying glass. The lower border of the ])alm, 

 on the contrary, is, in adult specimens, conspicuously sj)inulose, like in Slcrcom. p/ios- 

 phorus \ in the young female from .Stat. 48, however, it is still smooth. 



The legs of the 2'"' pair measure somewhat more than one-third ot those of the i^'. The 



