NO. 1480. SCHIZOPOD CRUSTACEAXS—ORTMANN. 51 



There is a small spine at the base of the basal joint of the pleopods (as 

 in G. soea). Only one epimeral spine on each side of anterior section 

 of sixth abdominal seg^ment. 



All other parts are similar to the corresponding parts of G. soea, 

 but the antennal scale has the marginal spine considerably shorter than 

 the terminal lobe, without serrations on the outer edge. 



This very remarkable species is so closely allied to G. zoea that I 

 should have taken the peculiar conformation of the carapace, caused Ijy 

 the constriction of its anterior part, for a monstrosit}', were it not for 

 the fact that two individuals are at hand. The comparatively short 

 spine of the antennal scale possibly constitutes another specific char- 

 acter; in specimens of G. zoea of the same size it is longer than the 

 terminal lobe. 



Both specimens are apparently males, since no traces of marsupial 

 lamellic are visible, and the coxopodite of the last pair of thoracic legs 

 has, posteriorly, a small tubercle, which undoubtedly represents the 

 male orifice. 



Measurements of the tyjJes. — Total length of larger individual, 75 mm. ; 

 length from tip of rostrum to tip of posterior spine of carapace, 46 

 nun. Total length of smaller individual, about TO nun., but exact fig- 

 ures can not be given, since the rostrum is broken oft" near the base. 



12. GNATHOPHAUSIA AFFINIS G. O. Sars. 



Gnatlioplumsia njfinis (I. (). Saks, Forh. Selsk. Christiauia, 1883, no. 7; Rep. 

 Challenger, XIII, 1885, p. 41, pi. v, tign. 7-10. 



I have never seen this species. It is very closely allied to G. zoea, 

 and dift'ers only in the following points: 



1. Supraocular and antennal spines smaller, the latter almost obso- 

 lete. Branch iostegal lobe slighth" angular, l)ut having no spine. 



2. Abdominal segments not keeled above, and possessing no dorsal 

 projections or spines on the hind margin. 



3. Posterior lappet of the epimera of the five anterior abdominal 

 segments rounded, not spiniform. 



Distribution: Only one specimen, a female, of this species is known 

 up to the present time, the one taken by the Challenger in the tropi- 

 cal Atlantic Ocean, midwa}' between Africa and Brazil (latitude 1 22' 

 north, longitude 23^^ 36' west), in 1,500 fathoms. It measured 81 ram. 



13. GNATHOPHAUSIA ELEGANS G. O. Sars. 



Gnathojyhausia clegans G. O. Sars, Eep. Challenger, XIII, 1885, p. 42, pi. vi, 

 figs. 1-5. 



Carapace with keels and spines of the type of the second group, but 

 upper lateral keel absent. Lower lateral keel curving up behind and 

 much farther distant from the marginal rim than in G. zoea. Dorsal 



