8 4 



(see the Table at p. 89) and therefore they certainly belong to this species. Professor Alcock, 

 however, may also be right when considering the species which occurs in the Arabian Sea, the 

 Gulf of Manar and the Bay of Bengal and which is no doubt the same as that which was 

 collected by the "Siboga", as identical with Nemat. cursor A. M.-Edw. of the Antilles, for the 

 species which was collected by the "Siboga", agrees indeed very well with the figure of Nemat. 

 cursor in the "Recueil de Figures de Crustacés nouveaux 011 peu connus", published by A. 

 Milne-Edwards in 1883, a copy of which I had the honour to receive from the author — never- 

 theless I not venture to follow him in this opinion, because the legs of the 2 nd and o f 

 the 5 ,h pair of our specimens show constant differences, as regards their 

 measurements, from those of specimens of Nemat. cursor A . M .-Edw. taken off 

 the east coast of the United States (S. I. Smith, Report on the Decapod Crustacea of 

 the Albatross Dredgings off the east coast of the United States during the summer and autumn 

 of 1884. Wash. 1886, p. 62). The measurements of one male and three females are mentioned 

 in this paper and I wish to call attention to the fact that some of Smith's measurements and 

 also a part of his description do not agree with the figure of Nemat. cursor in the above- 

 mentioned "Recueil". This figure may therefore perhaps once prove to be partly inaccurate, 

 which is made probable by the fact that the dactylus of the 5 th leg shows in this figure the 

 same size and shape as the dactylus of the two preceding legs, which is not the case in this 

 species. Unfortunately in his description of Nemat. cursor, published in 18S1, A. Milne-Edwards 

 has given no measurements at all of the legs. 



The male from Stat. 45 is 87 mm. long from tip of rostrum to tip of telson. The 

 rostrum extends almost to the middle of 3 vd antennular article and is \-dentate; 5 teeth stand 

 on the carapace, posterior to the orbital margin, and the tip of the rostrum is somewhat 

 upturned. The telson, feebly furrowed longitudinally, bears 8 or 9 pairs of dorsolateral spinules, 

 inclusive the pair near the tip ; the spinules are implanted dorsally on the borders of the dorsal 

 groove, except those of the 3 rd and 5 th pair, taking the hindmost as the first, which are placed 

 more laterally, nearer to the lateral margins. The legs of i st pair reach by the chela and 

 one-third of the carpus beyond the antennal scale; the other legs are all partly wanting. 



The young specimen from Stat. 88 is 38 mm. long. Rostrum y-dentate, reaching to the 

 middle of 2 nd antennular article, five teeth on the carapace. Legs of i st pair extending by the 

 chela and one-fourth of the carpus beyond the antennal scale. Sixth somite of abdomen 7 mm. 

 long, 2,45 mm. broad, almost 3-times as long as broad, telson long 6 mm., without the terminal 

 spines, and appearing as long as the outer uropod when the terminal spines are included. 



The female without eggs from Stat. 101, in which the rostrum is broken off, is 87 mm. 

 long from the far end of antennular peduncle to tip of telson and appears therefore almost 

 adult. Carpus of the i st pair of legs 13,4 mm. long, reaching by ajittlemore than one-fifth of its 

 length, viz. 3 mm., beyond the antennal scale, chela 3,4 mm. long, one-fourth of the carpus. 

 Legs of the 2 nd pair 66 mm. long, extending by the chela, the carpus and one-fourth of the 

 merus beyond the antennal scale; merus 19 mm. long, carpus 27,5 mm., chela 3,5 mm. Legs 

 of the 4 th pair 76 mm. long, almost as long as the body, and extending by the chela, the carpus 

 and one-third of the merus beyond the antennal scale: merus, carpus, propodus and dactylus 



& 



