284 DE. J. G. DB MAIS ON THE PODOPHTHALMOUS 



margin, the third tooth exactly above it ; the rostrum is more or 

 less curved upwards towards the apex. The specimen, in which 

 one of the second legs has still been preserved, is 72 millim, long 

 from the tip of the rostrum to the end of the terminal scale. The 

 leg of the second pair is 51 millim. long; the arm (8| millim. 

 long) projects almost as much forward as tlie external maxillipeds, 

 thus a little more than the peduncle of the external antennse ; 

 the carpopodite (13 millim. long) is about once and a half 

 as long as the arm, and somewhat thickened towards its distal 

 end ; the hand (18| millim. long) is almost once and a half 

 as long as tlie carpopodite, the palm (11 millim.) is a little 

 shorter than the carpopodite, and the fingers measure nearly 

 two thirds of the length of the palm. They meet together along 

 their whole length ; and both fingers are provided on their inner 

 margins with a thin acute edge; the mobile finger presents, more- 

 over, two minute teeth at its base, and the other finger one, 

 opposite those of the mobile finger. The whole leg is minutely 

 scabrous and rough, being covered by small spinules. 



The legs of the first pair project with their hands beyond the 

 antennal scales, the hands being half as long as the wrists. The 

 legs of the third pair project as much forward as the rostrum ; 

 and the other legs are scarcely shorter. 



The other specimens are about the same size ; but this 

 species, according to Dana, attains a length of 120 millim. 



P. equidens has hitherto been only recorded from Singapore, 

 and is still a very insufficiently known form. The species from 

 Mauritius, which Heller referred to P. equidens (Heller, Sitz- 

 ungsber. kais. Akad. der "Wiss. in Wien, Bd. xlv. p. 418, Taf. ii. 

 fig. 44) is certainly a different species, distinguished by the carpo- 

 podite of the larger hand being shorter than the palm. P. Idcs^ 

 Heller, may perhaps prove to be identical with Dana's P. equidens. 



Pamily PsisriEiD^. 

 Genus Pen^us, lE'abr. 

 158. Pek^tjs semisulcatus, de Saan. 



Penseus semisulcatus, de Haan, Fauna Japon., Crustacea, p. 191, 

 tab. xlvi. fig. 1 ; Miers, "On the Fenaidce" Proc. Zool. Soc. London, 

 18/8, p. 299. 



