2G0 Miss D. A. Stewart on the Extra- Antarctic 



Typhidse, but the structure of the seventh leg is totally 

 unlike that of any representative of this family with which 

 it might otherwise be confused. The general shape of the 

 body, the structure of the appendages, and formation of the 

 uropods and telson seem to indicate that it occupies a position 

 intermediate between the genera Euscelus and Schizoacelus, 

 approaching the former in the shape of the gnathopods and 

 the latter in the general form of the urosome and telson. 



Hemisoelus diplochelatus, gen. et sp. n. 

 (PI. VII. figs. 1-9.) 



Locality. Lat. obs. 15° 45±' S., long. 33° 11^' W., Sept. 

 10th, 1901 (near Bahia), one female, 2 mm. 



Body broad and stoutly built, pereioii slightly arched. 



Head short, flattened in front, slightly deeper than the 

 anterior thoracic segments. 



Eyes large, not reaching to the dorsal surface of the head. 



Coxal plates sharply distinct from the thoracic segments, 

 rectangular in shape, with the hinder corners sharply 

 produced backwards. 



First gnathopods (PI. VII. fig. 1) with the basal joint about 

 as long as the rest of the limb together and having one 

 small seta on the anterior border ; merus not produced ; 

 carpus broad, with five small setse on the hinder margin ; 

 carpal projection minutely serrated, about half as long as the 

 propodus ; dactylus stout, slightly curved, about one-third of 

 the length of the propodus. 



Second gnathopods (PI. VII. fig. 2) with the branchial 

 vesicle oval, slightly broader than the basal joint, but not 

 quite as long ; basal joint narrow and almost rectangular, 

 considerably longer than that of the preceding pair ; merus 

 somewhat broader than the third joint, having the two ante- 

 rior corners slightly produced, and a long subapical seta on 

 the hind margin ; carpal projection serrated, almost as long- 

 as the propodus ; dactylus slender, tapering to a fine point, 

 and strongly curved. 



Third and fourth pairs of legs (PI. VII. figs. 3 & 4) with 

 the branchial vesicles slightly longer than the linear basal 

 joint; merus somewhat widened in the distal portion ; carpus 

 shorter than the merus, lower front corner not produced ; 

 propodus slightly curved, narrower than the carpus ; dactylus 

 stout and strongly curved. 



Fifth pair of legs (PI. VII. fig. 5) having the basal joint 

 longer than in the third and fourth, and broadly ovate, with 



