544 MB. W. r. LANOHESTER ON THE [BeC. 3, 



XVIII. Genus Neptunus de Haan. 



26. Neptunus pelagicus Linn. 



Cancer pelagicus, Linn. Syst. Nat. (eel. xii.) p. 1042 (1766). 



Portunus (Neptumis) pelagicus, de Haan, Crust. Japon. p. 37, 

 pis. ix., s. (1839). 



Loc. Kota Bharu, Kelantan ; Trengganu. 



Five males and four females. Of the latter one bears ova, and 

 in another the presence of a parasite in the left branchial cavity 

 goes vi^ith an abdomen approaching the male in form. 



Dim. c? 121-5 X 65. J 98 x 53. S 83 x 45-5. S 83x45. 

 c? 57 X 31-5. 2 100-5 X 55. $ 125 x QS. $ 66-5 x 37. 

 5 53x28. 



27. Neptunus (Amphitbite) gladiatos Fabr. 



Portunus gladiator, Fabr. Ent. Syst., Suppl. p. 368 (1798). 



Lupea gladiator, M.-Edw. Hist. Nat. Crust, i. p. 456 (1834). 



Meptunus gladiator, A. M.-Edw. Arch. Mus. x. p. 330 (1861) ; 

 de Man, Mergui Crust, p. 70 (1888). 



Loc. Trengganu. 



A very large male and a small female, in which the swimming- 

 legs only are present. 



' In the male the median teeth of the front are much smaller than 

 the submedians, and the lowest external carina on the hand is very 

 strongly developed, forming an obtuse ridge proximaliy ; the 

 ridges on the second and third abdominal segments are also very 

 strong ; in these three points it resembles W. a7-ge7itatus White. 

 In the female the abdominal ridges are moderately prominent, and 

 the median frontal teeth, though smaller in size than, are equal in 

 length to, the submedians. In both there is a short blunt spine 

 over the eye as in N. gladiator, and there are no traces of the 

 silver sheen found in N. argentatus. They certainly belong to 

 N. gladiator Fabr., and it seems very possible that N, argentatus 

 White is no more than a variety of this species. 



The male bears on the legs, first two abdominal segments, and 

 the base of the left antenna some pedunculate Cirripedes, all 

 belonging to the genus Dichelaspis, and comprising two or possibly 

 three species. 



Dim. d 68 x 43. 2 23 X 14, 



XIX. Genus GojfiosoMA A . M.-Edw. 



28. GoNiosoMA NATATOB Ilerbst. 



Cancer natator, Herbst, Naturg. d. Krab. p. 156, pi. xl. fig-. 1 

 (1795). 



Ooniosoma natator, A. M..-'Edw. Arch. Mus. x. p. 370 (1861); 

 de Man, Arch. f. Naturg. liii. i. p. 334, pi. xiii. fig. 5 (1887). 



Loc. Pulau Bidan, Penang. 



A inale, of which the chelipedes are lost. 



This individual belongs, without doubt, to Herbst's species. I 



