148 



Memoirs of the Indian Museum. 



[Voi,. IV, 



a. Anterolateral angles of rostrum rounded ; no spinules on dorsal 



surface of telson 



b. Antero-lateral angles of rostrum acute ; numerous spinules on dorsal 



surface of telson . . 

 B. Mid-dorsal portion of telson with five long keels. 



1 . First five abdominal somites smooth 



2. First five abdominal somites finely grooved transversely and longitu- 

 dinally . . . . ... 



II. Rostrum sharply trispinous ; inner uropod abnormal in shape and in its 

 investment of setae [mandibular palp two- or three-segmented]. Group 

 II. 

 A. Telson normal in shape, its length greater or only a trifle less than its 

 length. 



1. Spines on external edge of basal segment of outer uropod forming an 



even series throughout its length, outermost slightly recurved ; 

 inner uropod more or less crescentic in shape, apex curved inwards. 



a. Submedian teeth of telson without spinules on inner margins ; 



lateral teeth represented by blunt rounded lobes ; dorsal surface 

 with three keels and a few rounded tubercles 



b. Submedian teeth of telson with spinules on inner margins ; lateral 



teeth sharp and well-formed ; dorsal surface with three keels and 

 large sharp spinules 



2. On external edge of basal segment of outer uropod two or three spines 



at distal end form large hooks, proximal part bare or with few 

 small straight spines ; apex of inner uropod more or less curved 

 outwards. 



a. Intermediate teeth of telson edge large ; lateral teeth absent. 



i. Intermediate ridges of last abdominal somite much narrower 

 than submedians ; mid-dorsal portion of telson occupied by 

 three large ridges 2 ; no spinules on inner edges of submedian 

 marginal teeth 

 ii. Intermediate and submedian ridges of last abdominal somite of 

 equal breadth ; mid-dorsal portion of telson with three keels 

 closely packed together in middle, with two fainter keels on 

 either side ' 2 ; spinules on both edges of submedian marginal teeth 



b. Intermediate teeth of telson edge very small ; lateral teeth minute 



[dorsal surface of telson with nine closely packed keels] 



! B. Telson very abnormal in shape, about four times as broad as long, 



sharply truncate behind ; the truncate portion reniform in shape 



and honeycombed, with a pair of long furci springing from the middle 



of its inferior edge . . 



3« Antero-lateral angles of carapace not in advance of rostral base ; median 



part of posterior margin of last abdominal somite concave in dorsal view ; 



[oerstedi]. 1 

 [festae]. 



glabrous, p. 167. 

 graphurus, p. 169. 



herdmani, p. 171. 

 drepanophorus, p. 173. 



brevisquamatus, p. 174. 



fimbriatus, p. 175. 

 spinoso-carinatus ,p. 173. 



furcicaiidatus, p. 176. 



1 Hansen 1895, p. 65 (footnote) and Bigelow, 1902, p. 152, text figs, 

 species as given by the latter author, the following may be added : — 



1890. Gonodadylus chiragra, Pocock, Journ. I y inn. Soc. Zool., XX, p. 526 (Fernando Noronha 

 1897. Gonodadylus chiragra, Nobili, Boll. Mus. Torino, XII, no. 280, p. 6 (Darien). 

 1901. Gonodadylus falcatus, Moreira, Arch. Mus. Nac. Rio de Janeiro, XI, p. 1 (Brazil). 



2 Not reckoning the ridge that runs to the apex of the intermediate marginal teeth. 



To the synonymy of this 



