ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 319 



Antennules moderately stout and composed of seven articulations. Antennae with 

 the outer ramus very rudimentary or wanting (see figs. 11 and 12). 



Second maxillipeds rather slender; end joint moderately elongated and narrow, 

 widest near the middle ; inner margin nearly straight, the outer slightly gibbous ; 

 terminal claw long and slender (fig. 13). 



Inner ramus of the first pair of thoracic legs elongated ; outer ramus three-jointed, 

 and scarcely half the length of the inner, and with the second joint rather longer 

 than the first or third (fig. 14). In the second pair, the inner ramus is moderately 

 stout and composed of two joints, the end one of which scarcely reaches beyond 

 the second joint of the three-jointed outer ramus ; the end joint of the outer ramus 

 is tolerably elongated and slender, and about one and a half times longer than the 

 preceding joint (fig. 15). 



In the fifth pair, the basal joint is broadly expanded and its inner lobe is obliquely 

 truncated and carries about six setae along the truncated margin, but the third one 

 from the inside is very small ; end joint small, ovate, and furnished with five setae on 

 the subtruncated end, as in the drawing (fig. 16), width being equal to about two- 

 thirds of the length ; the end of this segment is obliquely truncated and provided with 

 six setae, arranged as shown in the drawing (fig. 14). 



Caudal rami about as long as the last abdominal segment. 



Habitat. Scotia Bay, South Orkneys, in sittings from dredged material, collected in 

 June 1903 ; Station 325, 60 43' 42" S., 44 38' 33" W. 



This species may be distinguished from the others by the structure and armature 

 of the antennules and of the first and fifth pairs of thoracic legs. 



Laophonte exigua, new species. (PL VII. figs. 16-22.) 



female. Body small, narrow, elongated. Length, 0'62 mm. 



Antennules composed of seven joints ; second and third joints subequal and moder- 

 ately long, fourth and fifth small ; but the sixth and seventh, which are nearly equal, 

 are each about twice as long as the fifth joint. Antenna 1 and mouth organs nearly as 

 in Laophonte wiltoni. 



The inner ramus of the first pair of thoracic legs is long and slender, but the outer 

 is very short and composed of only two joints. In the next three pairs, the inner 

 ramus is short, moderately stout, and composed of two nearly equal joints, the first 

 joint being slightly larger than the other. 



The fifth pair are small, and the inner portion of the basal joint scarcely reaches 

 the middle of the second joint, and is furnished with four setae. The second joint 

 has the apex broadly but irregularly rounded, and furnished with six setae, three 

 on the inner aspect and three on the outer, with a distinct space between each group 

 of three. 



Caudal rami as long as the last abdominal segment : each ramus ends in a tolerably 

 stiff and moderately long bristle, and one or two smaller setae (fig. 17). 



(ROY. soc. EDIN. TRANS., vor,. XLVIII., 565.) 



