no. 1480. scnrzoron crustaceans— ortmann. 41 



Alcock); off Panama, 1,201 and 1.471 fathoms (Faxon); off Galapagos 

 Islands, 551, 1,189, and 1,322 fathoms (Faxon). 



If the specimen figured by Chun" is this species, we have to add: 

 Gulf of Guinea, 4,000 meters. 



8. GNATHOPHAUSIA LONGISPINA G. O. Sars. 



Giiathophausia. longispina G. 0. Sars, Forli. Selsk. Christiania, 1883 no. 10; Rep. 

 Challenger, XIII, 1885, p. 46, pi. vir, figs. 1-5; pi. vin. — Ortmanx, Bull. 

 U. S. Fish Comm. for 1903, Pt. 3, 1905, p. 969. 



This species is not represented in the present material, but I had 

 quite a number of specimens when I worked on the Hawaiian material, 

 and thus I am able to give a good account of it. 



Carapace with keels of the type of the second group: An upper lateral 

 keel is present; the lower lateral keel curves up behind, and runs 

 toward the postero-dorsal spine. The dorsal keel is continuous, and 

 projects as a long postero-dorsal spine. Rostrum long. Supraocular 

 spines well developed; antennal spine obsolete (very small or even 

 absent) ; branchiostegal spine well marked and triangular. No postero- 

 inferior spines, but posterior angles of carapace rounded off. (With 

 the exception of the branchiostegal spine, the spines of the carapace 

 are of the t} r pe of the second group.) 



Antennal scale of the type of the second group, and remarkably long; 

 the marginal spine is greatty produced, projecting considerably beyond 

 the terminal lobe of the lamellar part, and serrated at both the inner 

 and outer margins. 



Abdomen of the type of the second group, with a small posteriorly 

 projecting dorsal spine at the hind margin of each of the five anterior 

 segments. Epimera of the five anterior segments with the two lappets 

 acute, the anterior short and small, the posterior longer and spiniform; 

 in the male, the posterior lappet of the second segment is greatly 

 elongated, with a long spiniform tip; in the female, it does not differ 

 essentially from those of the other segments. 



Epimera of sixth abdominal segment of the type of the second group, 

 but there are two triangular, acute lappets on each side, as in G. gracilis. 



The chief specific characters are: The presence of a branchiostegal 

 spine, the shape of the antennal scale, and the character of the 

 abdominal segments. The remarkable posterior lappet of the second 

 abdominal segment is found onl} T in the male sex, and thus males and 

 females may be easity distinguished. 



As I have demonstrated with the help of Hawaiian material, the 

 rostrum, the dorsal and branchiostegal spines, and the marginal serra- 

 tions of the antennal scale change with age, being more strongty 

 developed in } r oung individuals. 



«Aus den Tiefen des Weltmeeres, 1900, p. 500. 



