^o.\m. SCHTZOrOD CRUSTACEANS— ORTAfANN. 41 



Alcock); off Panama, 1,201 and l,l7l 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, 1,000 meters. 



8. GNATHOPHAUSIA LONGISPINA G. O. Sars. 



(liutthophansla lum/isplna G. 0. Sars, Forh. Selsk. Christiania, 1S88 no. 10; Rep. 

 Challenger, XIII, 188.5, p. 46, pi. vii, fig.s. 1-5; pi. viii.— Oktmanx, Bull. 

 U. S. Fish Comm. for 1908, Pt. 3, 1905, p. 969. 



This species is not represented in the present material, l)ut I had 

 quite a number of specimens when 1 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 })ehind, and runs 

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

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

 spines well developed; antennal spine ol)solete (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 t3'pe of the second group.) 



Antennal scale of the type of the second group, and remarkabl}' long; 

 the marginal spine is greatly produced, projecting consideral)ly 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 live 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 (r. (jraciUs. 



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 only in the male sex, and thus males and 

 females may be easil}' distinguished. 



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

 rostrum, the dorsal and ])ranchiostegal spines, and the marginal stn-ra- 

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

 developed in young individuals. 



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



