70 CAIII. HDVALMIS, A.Ml'lll['t)l)A II Vl'i:i(ll DKA. VIBILWJE. 



Tlic second pair of antennd- are ei!i;lit-ii)iiitc(l in tlic iiimIc, fivc-joiiitr-d in tho female; 

 tlic last jdint is tlie siiortest. 



The Hrst two jjereional segniciits ave i'(|Uiil in Icnuth, tlic iiftii is tho loiigest. 



Thvfirst pair of pereiopoda (Pl. X, fig. 17) have tlio cai-pus as loiig as the metacarpus, 

 the postevior margin ai-nied with two bristles. The convex aiiterior mai-gin of the metacarpus 

 is iirmed Avith three bristles, the ]jostei'ior margin is almost straight, regularly serrated. The 

 dactylus is much longer than halt' the metciearpus, sparingly serrated at the posterior margin. 



The second pair (Pl. X, tig. 18); the (•ari)us is almost longer than ti le irietaearpus; 

 the car})al ))rocess is slender, sharp-pointed, shorter than the carpus itself, and scarcely as 

 long as the posterior margin of the metacarjnis. The metaearpus is stout, the lower an- 

 terior corner produced into a tolerably long seri-ated process, the lower posterior corner 

 produced into a somewhat shorter process, The lower parts of the anterior and posterior 

 margins are sharj)!}' serrated. 



The third and fonrlh pairs (Pl. X, tig. 19) have the tibia considerablv longer than 

 the carpus (4:3); the tibia is narrow, not tumid; the posterior margins of the carpus and 

 metacarpus are minutely serrated. The dactylus is almost straight, much longer than half 

 the metacarpus (5:7). 



The fifth avd si,vth pairs (Pl. X, tig. 20) are about a fourth longer than the fourth 

 pair, the sixth pair are a little longer tlian the fifth; the fe mur is laminar, linear with 

 rounded corners; the carpus and metacarpus arefringed along the anterior mai-gins with verv 

 short equidistant spines. The dactylus of the tifth pair is shorter than a third of the 

 metacarpus; the dactylus of the sixth pair is longer than half the metacarpus, irregularly 

 serrated at the anterior margin. 



The seventh pair (Pl. X, tig. 21) are equal in length to two thirds of the fourth. The 

 femur has the anterior and posterior margins straight; it is scarcely as long as the three 

 succeeding joints together. 



The pleon is as long as the last six pereional segments; the lower margins of the 

 iirst two segments are rounded, with nn obtuse angle just behind the middle. The lower 

 margins of the last segment are almost straight. 



The pleopoda have the raini scarcely as long as the peduncles. 



The second and third ural segments are coalesced, about a third shorter than the 

 first segment. The hinder corners are pi'oduced backwards into processes extending a 

 little farther than half the length of the telson. 



The uropoda (Pl. X, tig. 22); the peduncles of the iirst and second pairs are linear, 

 a little longer than the r;imi, serrated along the outer margins. The rami of the first 

 pair are equal in length, lanceolate, strongly serrated along both margins. The interiör 

 ramus of the second pair is lanceolate, much longer than the exteriör, strongly serrated 

 at both margins. The peduncle of the third pair is only a little longer than the rami, 

 and much shorter than the last ural segment. The interiör ramus is a little longer the 

 exteriör, minutely serrated. 



The telson is elongate, triangulär, with the margins feebly convex; it is only a fourth 

 shorter than the peduncle of the last pair of uropoda. 



