100 MR. F. E. BEDDARD ON ISOFODA COLLECTED [Feb. 2, 



the thoracic appendages are slender and not greatly elongated ; they 

 terminate in a single claw ; the first pair are subcheliform. The 

 uropoda are rudimentary, consisting of only a single conical setose 

 joint. 



1. ASTRTJRUS CRUCICAUDA, n. Sp. 



This species is represented by a large number of individuals 

 dredged in shallow water off Kerguelen ; the largest individuals only 

 measure 4 or 5 millim. in length. 



The body is more or less pear-shaped, the anterior region of the 

 thorax being wider than the posterior. The head is narrower than the 

 succeeding segment of the thorax ; it is prolonged anteriorly into two 

 long slightly divergent processes, each of which is as long as the 

 head itself; laterally is a longish process on either side, which 

 terminates in a slightly swollen extremity; these processes resemble 

 the eye-stalks in iMunna, and they contained some orange-coloured 

 pigment in the interior, but no recognizable trace of lenses ; the 

 surface, moreover, is covered with numerous short spines like the rest 

 of the body. The four anterior thoracic segments are of nearly 

 equal length, but they increase in width up to the third ; the median 

 region of these segments is convex and densely covered with short 

 spines ; the lateral margins are prolonged into long stout spines, 

 which are themselves covered with short spines like the thoracic 

 segments and the rest of the body. The three posterior segments 

 are all much shorter than the fourth segment, and decrease gradually 

 in length ; their lateral margins are without the greatly elongated 

 spines of the anterior segments ; only on the fifth and sixth segments 

 one of the spines which fringe the body is rather more elongated than 

 the rest. The abdominal shield is oval, tapering jjosteriorly ; it termi- 

 nates in four somewhat flattened spines arranged in the form of a 

 cross. The antennules consist of a two-jointed peduncle and a five- 

 or six-jointed flagellum ; the proximal joint of the peduncle is 

 broader and shorter than the succeeding joint. The antennce are 

 not so long as the body but considerably longer than the antennules ; 

 the two proximal joints of the peduncle are elongated, the flagellum 

 is shorter than either of these. The mandibles have a three-jointed 

 palp. The first pair of thoracic appendages are modified into a 

 prehensile limb ; the remaining thoracic appendages are slender and 

 elongated, particularly the three posterior pairs. The uropoda are 

 rudimentary as in Munna. 

 Kerguelen, 120 fathoms. 



Neasellus, F. E. B. 



Ke.jseUus, F. E. Beddard, Narr. Chall. Exp. vol. i. p. 882. 

 fig. 32G. 



This new genus is represented by a single species from Kerguelen. 

 It roines near to Fleurogoniuin and Lepfaspidia, but is distinguished 

 by the great horizontal elongation of the head, which is as wide 

 as the following segment and bears the antennary organs at the 



