Indian Deep-sea Dredginrj. 241 



it." proximal half two or tliree large s|)ine3 on the upper 

 margin and one or two smaller ones on the lower, distal ly it 

 is finely serrated below and bears above the usual subterniinal 

 claw; the carpopodite lias two subterniinal claws, one ab)ve. 

 the other below ; the propodite in its palmar portion is tinely 

 serrated below and has a subterminal spine, or two, above. In 

 the male the fifth pair of thoracic legs are not quite perfectly 

 chelate owing to the shortness of the pollex. 



The first pair of abdominal appendages in both sexes have 

 the usual shapes and modifications, namely spoon-shaped in 

 the male and uniramous and setose in the female. 



Colour in life uniform bright pink. 



Numerous specimens of both sexes from Stations 112 and 

 116, 561 and 405 fathoms. The largest female measures 

 119 millim. in the middle line from the rostrum to the tip of 

 the telson ; the males are smaller. One of the large females 

 was luminous at two points between the basal joints of the 

 last pair of thoracic legs, where there is a glandular organ 

 very like that found in the females of the common species of 

 Penceus. In the introduction to this paper (Ann. & Mag. 

 Nat. Hist., July 18fJl, p. 16) tliis species was confused with 

 Willemoesia forceps, A. M.-Edw., which was therefore 

 wrongly stated to be luminous. 



PentacheJes phosphorus has been also dredged in the 

 Andaman Sea at 375 and 500 fathoms ; in the Bay of Bengal, 

 oflP the Kistna Delta, at 678 fathoms ; in the Gulf of JManar 

 at 675 fathoms ; and in the Laccadive Sea at 740 fathoms. 

 It is by far the commonest of the Indian species of the genus. 



71. Pentacheles cerata*, sp. n. 



PentacJieles, sp. " distinguished by the huge spine which springs for- 

 wards from the middle of the fifth abdominal tergum," Wood- 

 Masou, Admin. Eep. Marine Survey of India, 1890-91, p. 19, 



Carapace remarkably smooth, slightly pubescent, especially 

 towards the margins ; its greatest breadth, which is just in 

 advance of the cervical groove, is less than two thirds of its 

 greatest length ; the median carina ends in a double rostral 

 spine, between which and the cervical groove is a line of 

 four spines, the penultimate one being double ; immediately 

 behind the cervical groove is a pair of spines, and at the 

 hinder edge of the carapace another larger and more widely 

 separated pair ; the frontal margin is perfectly smooth ; the 



* This species is figured in "Illustrations of the Zoology of the Royal 

 Indian Marine Steamer ' Investigator,' Crustacea," pt. ii. (pi. viii.), to be 

 issued early this year. 



