547 



a dense crowd of slender bristles. Pereiopoda, uro^Doda and telson of the 

 usual structure. 



Remarks — In the restriction now generally adopted, this genus is 

 chiefly distinguished by the structure of the anterior gnathopoda in the male, 

 and by the dense supply of bristles clothing both this and the succeeding pair 

 in the same sex. Otherwise it is very nearly allied to the 2 preceding genera, 

 and Bruzelius originally comprised within it also the species of those 

 genera. Gammarus tenuis of Dana may perhaps be referred to this genus. 

 Two other exotic species have been added by the Rev. Mr. Stebbing from 

 the Challenger Expedition. To the fauna of Norway belong 3 species, to 

 be described below. 



5. Autonoe Websteri, (Sp. Bate). 



(PI. 194.) 



Lembos Websteri, Sp. Bate, Ann. Nat. Hist. 1867, p. 142. 



Syn : Microdeutopua Websteri, Sp. Bate. 



Body somewhat strongly built, and rather tumid in the female, with 

 broadly rounded back. Cephalon shorter than the first 2 segments of meso- 

 some combined, lateral corners obliquely deflexed and narrowly rounded at 

 the tip. Anterior pairs of coxal plates scarcely as deep as the corresponding 

 segments, 1st pair in female subrhomboidal, in male considerably larger, and 

 produced in front to an acuminate projection extending beyond the postantennal 

 corners, the succeeding pairs about as in Microdeutopus. Last pair of epimeral 

 plates of metasome rounded at the lateral corners. Eyes distinct, though 

 very small, and rounded oval in form, pigment dafk. Superior antennae 

 somewhat exceeding half the length of the body, 2nd joint a little longer 

 and much narrower than the 1st, flagellum exceeding in length the pedimcle, 

 and composed of about 15 articulations, accessory appendage rather fuUy 

 developed, being considerably longer than the last pediincular joint, and 

 consisting of 5 articulations, the last of which is very small. Inferior 

 antennae somewhat exceeding half the length of the superior, and of the 

 usual structure. Anterior gnathopoda in female rather strong, with the 

 propodos much larger than the carpus and oblong oval in form, being 

 scarcely at all expanded distally, palm imperfectly defined, dactylus of 

 moderate .size and denticulated inside. Posterior gnathopoda much smaller 

 than the anterior, with the propodos scarcely longer than the carpus, and 



