TO INDTAN CARCINOLOGY. 455 



288. GoNODACTTLTJS Demanii, n. sp. (PI. XL. figs. 23, 24.) 



Gonodactylus, n. sp.? De Man, Brock's Crust, p. 571, Taf. xxii.«, fig. 7 (1888). 



Rameswaram ; four females, two males {J. R. K. ). 



I have pleasure in naming this species after Dr. J. G. De Man, who, in liis Report on 

 the Crustacea collected by Dr. Brock in the Malay Archipelago, describes and figures a 

 single specimen from Pulo Edam, pointing out that it is probably new, but without 

 giving it a name. It is closely allied to G. chlvagru, but tlie differences seem to me 

 other than varietal, and are not due to the specimens being young, for the following 

 comparison has been made with examples of G. chiragra of similar size, and from various 

 localities, in the British Museum collection. 



In G. chiragra the median of the three bosses or elevations on the dorsal surface of 

 the telson is always narrow and longitudinally oval, witli its distal end frequently 

 embraced by a liorse-shoe-shaped or semicucular elevation, but without spinules. In 

 G. Demanii the central elevation is much broader, and indeed subglobular ; when viewed 

 in profile it is also seen to rise much higher aljove the level of the telson than in the 

 other species. A series of from five to seven spinules is placed at the distal end of this 

 elevation, usually arranged in a somewhat semicircular form, l)ut there is no trace of the 

 semicircular elevation seen in G. chiragra, unless the spinule-bearing region represents 

 it. The narrow lateral bosses, which are not sufiiciently defined in De Man's figui'c, 

 carry one or two spinules at their distal ends, and two or three spinules also occur at 

 the base of each of the two submediau terminal spines of the telson. None of these 

 spinules occur in G. chiragra, and in this species the four inner longitudinal and spinulc- 

 tipped elevations on the sixth abdominal segment are subequal in size, or at most the 

 median pair are only very slightly larger, whereas in aU my specimens of G. Demand 

 the median pair are distinctly larger. The lateral processes of the frontal plate are more 

 acute than in G. chiragra, but this part appears to vary slightly in the latter species. 

 In all the specimens, round black pigment spots occur on the dorsal surface of the 

 hinder portion of the carapace, on the second free thoracic segment, and on the first, 

 third, fourth, and fifth tibdominal segments ; this may be a juvenile character, but in 

 similar-sized examples of G. chiragra the mottlings, when present, are neither so well 

 marked nor so regularly distributed. 



The largest specimen, a female, is 23 mm. long, and the largest male 20-5 mm. ; but 

 the second male, although only 12 mm. long, has the sexual appendages developed. 

 De Man's specimen, a female, was 17 nun. long. 



Distrihntion . Pulo Edam {Do M(t)i). 



Genus Protosquili.a, Brooks. 

 289. Protosquilla trispinosa (Dana). 



Gonodactylus trispmoms{T)a.xi9.),'bil\ers,,X\\n. Mag. Nut. Hist scr. 5, vol. v. p. 11, pi. iii. fig. 10 (1880). 



Rameswaram {Thnrstou) ; Gulf of Martaban ; Ceylon [Brit. Mus.). 



Distribution. Mauritius {Hoffmann) ; West Australia and Amboina {Miers) -. Auckland, 

 New Zealand {Heller); Fijis (Dana). 



