1913J S. Kemp: Crustacea Stomatopoda of the Indo-Pacific Region. 157 



1907. Gonodadylus chiragra, Borradaile, Trans. Linn. Soc. Zool. (2), XII, p. 211 (including vars. 



a/finis, smithi, incipiens, anancyrus, confinis and tumidus). 

 1910. Gonodadylus chiragra, Lenz, in Voeltzkow's Reise in Ost-Africa, II, p. 571 (including vars. 



tumidus, smithii and incipiens). 

 1910. Gonodadylus chiragra, Fukuda, Annot. Zool. Japon., VII, p. 141. 



The carapace is slightly narrower in front than behind and its greatest breadth is 

 about three quarters its median length excluding the rostrum. The posterior margin 

 is straight or very slightly concave and the anterior margins on either side of the rostrum 

 slope forwards, so that the broadly rounded antero-lateral angles are very considerably 

 in advance of the rostral base. The rostrum bears a stout median spine which may 

 project beyond the middle of the eyestalks ; the lateral margins are anteriorly divergent 

 and the antero-lateral angles are subacutely, or, in rarer instances, rather broadly 

 rounded. 



The dorsal processes of the ophthalmic somite (fig. 107) consist of two large sub- 

 triangular plates, separated distally by a narrow fissure ; the anterior margin of each is 

 oblique and is recèdent from the middle line. The eyes in well-grown specimens are 

 about one quarter the median length of the carapace and reach almost to the middle of 

 the second segment of the antennular peduncle. The cornea is set very obliquely on 

 the stalk. 



The mandibular palp is composed of three segments. 



The propodus of the raptorial claw is greatly dilated at its distal end in both sexes 

 and its upper margin is deeply channelled for the reception of the dactylus. The outer 

 edge of this channel is as a rule very finely spinulose, but not pectinate, in its proximal 

 half ; distally the edges are flattened and both are transversely striate. At the 

 proximal end of the inner edge there is a single mobile spine. The basal portion of 

 the dactylus is very strongly inflated ; the slender finger bears microscopic spinules 

 on its inner margin and is flexed inwards near the apex. 



The lateral margins of the sixth and seventh thoracic somites are truncate with 

 rounded anterior and posterior angles. Those of the eighth somite are produced to a 

 bluntly rounded point. The first five abdominal somites are quite smooth except for a 

 sharp L-shaped groove running along the lateral and antero-lateral margins. The 

 postero-lateral angles of the first four somites are rounded, those of the fifth bluntly 

 rectangular. The posterior margin of the sixth somite is straight or slightly convex 

 in dorsal view and on the upper surface of this somite there are six longitudinal 

 ridges which usually terminate in spines. The latter in young specimens are not in- 

 frequently large and stout, while in very old examples they may be wholly obsolete. 

 The carinae of the lateral pair terminate in the postero-lateral angles. 



The telson is broader than long and in the middle of its dorsal surface there are 

 three smooth longitudinal ridges. Close to the anterior margin, immediately below the 

 intermediate carinae of the last abdominal somite, there are two small rounded tubercles. 

 In large specimens a small lateral outgrowth is usually visible at the posterior end of the 

 median ridge trending forwards on either side, and thus giving to the whole keel the form 

 of an anchor. The flukes of this anchor are occasionally wholly absent both in large 



