376 ME. 3. E. HENDEESON— A CO^■TEIBUTION 



This species does not appear to l)e commou ; in fact Prof. A. Milne-Edwards had not 

 met with specimens when he wrote his Revision of the Portunidae. It is distinguished 

 hy the rudimentary state of the second lateral spine of the carapace, which is very 

 minute, and appears as if merely a portion of the first spine; the remaining antero- 

 lateral spines are practically subeqaal. The median and submedian frontal teeth are 

 obtusely rounded and subequal, while the two outermost teetli on each side are more or 

 less triangular. The merus of the chelipedes carries two or three spines on its anterior 

 margin, v/hile the posterior margin is unarmed ; the carpus lias a large spine on its 

 upper surface, and three spinules on the outer surface ; the hand has three finely- 

 granulated ridges on its outer surface, two spines on the upper margin, and two on the 

 outer surface, one of the latter placed at the articulation with the carpus. The fingers 

 are slightly ridged externally. The penultimate joint of the swiinming-legs is spinulose 

 along its posterior margin, and a prominent spine is placed on the posterior margin 

 near the distal end of the merus. 



The largest specimen, a female without eggs, is 11 mm. long and 17 mm. broad, 

 while a second female, carrying eggs, is considerably smaller. 



Distribution. Philippines {Dana); Tvmov {De 3Ian) ; Yiiennion (Ilojf ma ii n) . 



117. GoNiosoMA ORisfATUM, A. Milue-Edw. 



G. ornatum, A. Milne-Edwards, Nouv. Arcli. Mus. Hist. INI at. t. x. p. 370 (1861). 



( = Thalaniita truncata, De Haan) . 



Madras, not uncommon {J. B. S.). 



The carapace of a male is 21 mm. long and 30 mm. broad, the right chelipede 55 mm. 

 long ; a female with ova is 15 mm. long and 22 mm. broad. Specimens in the British 

 Museum are considerably larger. 



Distribution. Malay Archipelago ; Japan. 



118. GONIOSOMA VAKIEGATUM (Pabr.). 



G. variegatum (Fabr.), Miers, 'Alert' Crust, p. 232 (1884). 



Madras, very common {J. B. U.) ; Bombay {Dmj) ; Kurachi {Brit. JIus.). 



In this species, and in the form which I term var. callianassa, the frontal teeth are 

 more or less obtusely rounded in the adult, the last lateral spine of the carapace is 

 about twice the length of the preceding spines, the hands are somewhat swollen, and the 

 carapace is ])ubescent. De Haan seems to liave regarded the two forms as belonging to 

 distinct species ; on the other hand, A. Milne-Edwards probably united both in his 

 G. callianassa. In what I regard as the typical form, the median frontal ^ii'ojections 

 are very obtusely rounded, the surface of the carapace is finely punctate when the hairs 

 are removed, and the transverse ridges are only moderately developed, there being none 

 on the branchial area, and they are only faintly seen on the cardiac area. The merus 

 of the chelipedes has usually two spines on its anterior margin, and there are also two 

 sjnnes on the upper surface of tlie hand; the ridges on the outer surface of the hand are 

 smooth, while on the inner surface they are almost obsolete ; the under surface of the 



