AMPHIPODA — STEBBING. 591 



peraeon segments form a carina, which is continued on the sides 

 of the first two pleon segments. The second pleon segment has 

 its lower maigin produced into a simple tooth ; the third has the 

 dorsal carina low and not apically pointed, but its postero-lateral 

 angle forming a rather strongly recurved tooth. 



No eyes could be discerned. The first antennro have the first 

 joint slightly bent, as long as the second and much stouter, the 

 third joint about half as long as the second and more tiian twice 

 as long as it is broad. The flagellum consists of seven or eight 

 unequal joints, each with an apical filament, and all combined as 

 ong as the last two joints of the peduncle. The secondary 

 flagellum is slender, its single joint about equal in length to the 

 first of the principal. Tiie second antenna; have the fourth joint 

 slightly longer than the fifth, which is longer than the second 

 joint of the first antennfe. The flagellum is seven-jointed. 



The mouth-organs show close agreement with those which Sars 

 has described for the genus and figured for B. typica. The apical 

 border of the upper lip is more regularly rounded, without the 

 flattened appearance given it by Sars. The stout compact 

 mandibles seem to have a microscopic accessory cutting plate. 

 In the maxillfe and maxillipeds there is nothing essentially dis- 

 tinctive. 



The first and second gnathopods and first and second peraeopods 

 are scarcely distinguishable from those of the two northern 

 species. The first three side-plates have the lower front corner 

 produced forward, well rounded in the first pair, narrowly so in 

 the second, acute in the third. In the fourth, which has the hind 

 margin excavate, the lower margin is rounded and produced 

 acutely backward as in B, typica. For B. tubercuJala, Sars figures 

 this plate as having an obliquely emarginate lower edge. The 

 detailed figure, lettered p*, as according to his notation belonging 

 to what is here called the second peraeopod, must certainly be a 

 mistaken lettering for p^, the first peraeopod. The third, fourth, 

 and fifth peraeopods agree nearly with those of B. tijpica, but have 

 the hind margin of the narrowly oblong second joint not smooth 

 but serrate; the broad, distally produced fourth joint has an 

 extra proximal expansion only in the tifth pair, of which the 

 second joint is distinguished by having the lower hind corner 

 sharply bidentate, not blunt or rounded. 



The coupling spines on the peduncles of the pleopods are 

 rather long and slender ; the rami are nine- to ten-jointed. 



The first uropods have the slender outer ramus about three- 

 fourths as long as the inner, with the length of the peduncle 

 intermediate. In the second pair the peduncle is short, the outer 

 ramus scarcely so long as that of the first pair, but the inner very 



