416 M. A. Boeck on the Ampliipoda 



strong, the second smaller, directed somewhat downwards, and 

 the third broad, but less considerable, nearer the end of the 

 joint. The segments of the body are much shorter, and the 

 posterior legs of the same form, but longer, than in JE. longi- 

 cornis. The abdomen and respiratory vesicles are of the same 

 form as in the latter. 



jEginella,) mihi. — This genus, which forms a transition be- 

 tween the preceding and following genera, I have already 

 characterized by its want of palpi on the mandibles, and by 

 the abdomen being, as in the genus Caprella, formed of two 

 segments, with unjointed appendages. My typical species of 

 this genus, to which Dana's species of JEgina likewise cer- 

 tainly belong, is 



2E. spinosa, mihi. — Head small ; forehead projecting in a 

 pointed spine. The superior antennae reach to the fourth 

 segment of the thorax. The first and fourth joints of the 

 peduncle are nearly of equal length ; but the second is much 

 longer than these. The nagellum is longer than the peduncle, 

 and consists of twenty joints. The inferior antennae are about 

 as long as the peduncle of the superior antennae. The first 

 joint is furnished with a long, thin, olfactory spine. The first 

 segment of the thorax is furnished at its anterior extremity 

 with a long strong spine, directed forwards and somewhat 

 curved ; the second segment has two similar spines on its an- 

 terior third, standing side by side, and a single one at its pos- 

 terior extremity. In addition there are two large tubercles at 

 the sides, above the origin of the second pair of legs. The 

 third segment is longer than the second, and equal in length 

 to the fourth. Both these are furnished at their anterior ex- 

 tremity with two geminate tubercles, two similar ones in the 

 middle over the origin of the respiratory vesicles, and a single 

 one at the posterior extremity. The sides are bounded towards 

 the belly by a sharp line, which is furnished with strong spines 

 at the anterior extremity of the segment, then a little further 

 back, and finally just above the respiratory vesicles. The 

 fifth segment is somewhat longer than the fourth, and has a 

 similar armature of tubercles. The last two segments are very 

 short, and furnished with strong tubercles in the middle and 

 over the origin of the legs. The parts of the mouth are long. 

 The first pair of feet are small, and the second pair not very 

 large, but strong and thick. Abdomen as in Caprella. 



Caprella, Lam. — To this genus I can add three new species, 

 of which the first two belong to the group of species in which 

 the males and females are of very dissimilar form. 



C. JEsnmrkii, mihi. — This species, which is 12 millims. in 

 length, was found at Beian by Rasch and Boeck. The head 



