21 



1 895» P- I21 ' Plate XXXIII, Fig. i, ia, i 6). Now I would first call attention to a clerical 

 error in Smith's description, 1. c. p. 359 (15). This author writes "Including the very long and 

 slender spine of the anterior angle, there are only five spines on the lateral margin in front 

 of the cervical suture each side", in the figure 1, however, of 1886, the anterior division of 

 the lateral margins appears to be armed with six spines on each side, including the spine at the 

 anterior angle. The number of spines on the middle and on the postenor division was not 

 described, but the figure shows 3 spines on the middle and 7 on the posterior division : a s 

 regards the ar mat ure of the lateral margin this species there fo re fully 

 agrees with Stereom. andamanensis. As regards the spinulation of the upper surface of the 

 carapace, Stereom. nana seems to differ from Stereom. andamanensis i° by the antero-internal 

 angle of the orbital notch being 1111 armed, according to the figure, while in Stereom. anda- 

 manensis that angle bears a well developed spine, directed upward and slightly outward, 2 by 

 the sublateral ridge on the branchial regions being armed only with five spines, while adult 

 specimens of Stereom. andamanensis usually present 7 or 8 spines on that ridge. With regard 

 to this character I would, however, remark that there are only 6 spines, in the adult male of 

 Stat. 314, on the left and 7 on the right side and furthermore that the young female from 

 Stat. 48 carries also five spines on the sublateral ridge. In Stereom. nana the outer angle 

 of the basal joint of the antennular peduncle is armed with two spinelets, according to the 

 figure, just as in Alcock's type. In Stereom. nana there seems to be no spine at the 

 anterior angle óf the pleura of the 2 nd abdominal somite and near the anterior extremity of 

 the telson the figure 1 a presents but one single spiniform prominence, while one observes two 

 tubercles behind one another in Stereom. andamanensis, but we read in Smith's description that 

 there is "occasionally a smaller secondary prominence just back of it". 



The Pacific examples, described by Faxon, agree with the above described specimens 

 of Stereom. andamanensis by the lower tubercle at the posterior end of the sulcated carina on 

 the 6 th abdominal somite and by the spine near the base of the telson being reduced to a 

 blunt tubercle. Prof. Smith's suggestion that Stereom. nana should be only a dwarf deep-water 

 variety of Stereom. sculpta, is, however, quite erroneous. 



General distribution: Off the Travancore coast, 1043 fathoms. 



Polycheles Heller. 



Polyclieles C. Heller, in: Sitzungsber. Kais. Akad. Wiss. Wien, Bd. XLV, 1862, p. 389. 

 Pentaclieles A. Alcock, A descriptive Catalogue of the Indian Deep-Sea Crustacea, Decapoda 

 Macrura and Anomala in the Indian Museum, Calcutta 1901, p. 171. 



In this genus the lateral borders of the carapace are almost invariably armed with more 

 than 20 spines (as regards the only exception, Pol. obscurtis (Sp. Bate), vide p. 468). Median 

 dorsal carina of carapace usually with no definite, small number of spines, but mostly doublé, 

 granulated, rarely nodulated, often traversed by bead-like tubercles or granulations or covered 

 with crowded spinules. First abdominal tergum probably never armed with two small spines at 

 the outer ends of the anterior border. Epipod of external maxillipeds normal, though it ma)- 



