148 Memoirs of the Indian Museum. [Voy. IV, 
a. Antero-lateral angles of rostrum rounded ; no spinules on dorsal 
surface of telson .. aa até x .. [oerstedi).! 
b. Antero-lateral angles of rostrum acute ; numerous spinules on dorsal 
surface of telson .. : acs ..  [festae}. 
B. Mid-dorsal portion of telson with five long feetds } 
1. First five abdominal somites smooth 2 : .. glabrous, p. 167. 
2. First five abdominal somites finely grooved transversely aa longitu- 
dinally .. se ot : ; .. graphurus, p. 169. 
II. Rostrum sharply trispinous ; inner uropod shauna in aaa and in its 
investment of setae [mandibular palp two- or three-segmented]. Group 
Oe 
A. ‘lelson normal in shape, its length greater or only a trifle less than its 
length. 
I. 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 oe .. herdmanti, p. 171. 
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 ae : : .. drepanophorus, p. 173. 
2. On external edge of basalsegment of outer scohed two or oe 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*; no spinules on inner edges of submedian 
, marginal teeth .. ps di 5c ..  brevisquamatus, p. 174. 
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® ; spinules on both edges of submedian marginalteeth fimbriatus, p. 175. 
b. Intermediate teeth of telson edge very small ; lateral teeth minute 
[dorsal surface of telson with nine closely packed keels] .. spinoso-carinalus, p. 173. 
B. ‘elson 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 .. : : ..  furcicaudatus, p. 176. 
B. Antero-lateral angles of carapace not in ey ance of rostral aes median 
Patt of posterior margin of last abdominal somite concave in dorsal view ; 
1 Hansen 1895, p- 65 (footnote) saat Biecioee 1902, p. 152, text figs. 1, 2. ‘To the synonymy of this 
species as given by the latter author, the following may be added :— 
1890. Gonodactylus chiragra, Pocock, Journ. Linn. Soc. Zool., XX, p. 526 (Fernando Noronha). 
1897. Gonodactylus chiragra, Nobili, Boll. Mus. Torino, XII, no. 280, p. 6 (Darien). 
igor. Gonodactylus falcatus, Moreira, Arch. Mus. Nac. Rio de Janeiro, XI, p. 1 (Brazil). 
* Not reckoning the ridge that runs to the apex of the intermediate marginal teeth. 
