544 Mil. W. F. LANCHESTER ON THE [Dec. 3, 



XVIII. Genus Neptunus de Haan. 



26. NEPTTrarUB pelagicus Linn. 



Cancer pelagicus, Linn. Syst. Xat. (ed. xii.) p. 1042 (1766). 



Porhmus (Neptunus) pelagicus, de Haan, Crust. Japon. p. 37, 

 pis. ix., x. (1839). 



Loc. Kc-ta Bharu, Kelantan ; Trengganu. 



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

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

 goes with an abdomen approaching the male in form. 



Dim. <$ 121-5 x 65. d 98 x 53. 3 83x45-5. 3 83x45. 

 3 57 x 31-5. $ 100-5 x 55. $ 125 x 68. $ 66-5 x 37. 

 ? 53x28. 



27. Neptunus (Amphiteite) gladiator Labr. 



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



Lupea gladiator, M.-Ld\v. Hist. Xat. Crust, i. p. 456 (1834). 



Neptunus gladiator, A. M.-Ed\v. 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- 

 legfi 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 proximally ; the 

 ridges on the second and third abdominal segments are also very 

 strong; in these three points it resembles A", argentatus "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 

 A', gladiator Labr., and it seems very possible that A r . 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 Cirripedee, all 

 belonging to the genus Dichelaspis, and comprising two or possibly 

 three species. 



Dim. J 68x43. $ 23x14. 



XIX. Genus Goniosoma A. M.-Edw. 



28. Goniosoma natator Herbst. 



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

 (1795). 



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

 (1- Man, Arch. f. Naturg. liii. i. p. 'X'A, pi. xiii. fig. 5 (18 



Loc. Lulau Bidan, Penang. 



A male, of which the chelipedca are lost, 



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



