28 BULLETIN 201, UNITED' STATES NATIONAL MUSEUM 



The specimens are arranged in order of length, and, though they 

 are few, they cover a wide range of size, 24 to 95 mm. Allowing for 

 the small numbers, individual variation, and the somewhat rough 

 nature of the measurements, the table does indicate that the relative 

 lengths of the rostrum and the posterolateral spines of the carapace 

 do decrease with age and that the number of teeth on the antennal 

 scale does increase with age. This is, of course, exactly what Ortmann 

 contended in his paper (1906), but I have thought it worth while to 

 give the above figures in support of his contention. 



GNATHOPHAUSIA GRACILIS Willemoes-Suhm 



Gnathophausia gracilis Willemoes-Suhm, 1875, p. 33, pi. 9, fig. 1. — Ortmann, 



1906, p. 39. 

 Gnathophausia dentata Faxon, 1893, p. 217. 

 GnathopJiausia orevispinis Faxon, 1895, p. 216, pi. J. 

 GnathopJiausia bidentata Illig, 1906b, p. 229, fig. 2. 

 Gnathophausia sp. Chun, 1900, pp. 289, 516, 531 ; 1903, p. 551, pi. facing p. 536. 



Occurrence. — Philippine Islands : Albatross stations 5299, 1 male, 

 45 mm. ; 5670, 1 female, 61 mm. West coast of America : Specimens 

 from Albatross stations 3361*, 3400*, and 3411* were identified by 

 Faxon (1895) as G. brevispinis ; Ortmann (1906) identified specimens 

 from Albatross station 3128*; and specimens from Albatross stations 

 4652* and 4656* were identified by Hansen (1912). 



Distribution. — Faxon recorded this species from the west coast of 

 Mexico, off Panama, 1,201 to 1,471 fathoms, and from off the Galapagos 

 Islands in 551 to 1,322 fathoms. Ortmann's specimen came from the 

 coast of California in 627 fathoms. These are the only records from 

 near the American coast. All the specimens that I examined are from 

 the waters around the Philippine Islands. 



Remarks. — The two specimens that I examined agree with the de- 

 scription of this species given by Ortmann. In both specimens the 

 gastric crest is very prominent and the lower of the two spines at the 

 posterolateral angle of the carapace is obsolete. In the smaller speci- 

 men the rostrum is 27 percent of the length of the specimen from the 

 eye to the end of the telson and in the larger specimen it is only 20 

 percent of this length. The latter is a female in which the incubatory 

 lamellae are still very small and undeveloped. 



GNATHOPHAUSIA LONGISPINA G. O. Sars 



Gnathophausia longispina G. O. Sars, 1884, p. 8 ; 1885, p. 46, pi. 7, figs. 1-5 ; pi. 8. — 

 Ortmann, 1905, p. 969 ; 1906, p. 41.— Hansen, 1910, p. 17.— Shiino, 1937, p. 

 184, fig. 2. 



Occurrence. — Japan: Albatross stations: 4905, 7 specimens; 4906, 

 2 females, 35 mm., and 1 male, 40 mm. ; 4907, 2 males, 3 females, and 

 1 immature, 24 to 40 mm. ; 4908, 1 male, 2 females, and 1 immature, 

 27 to 41 mm.; 4911, 1 male, 1 female, and 2 immature, 23 to 48 mm.; 



