.V^]T^ ISOPOD CRUSTACEAXS—BICHARDSOX. 



-Tecticeps alascexsis. 



JIEX OF FEMALE. X4f. 



a very pointed extremity, more acute in the male than in the female. 

 The iiropods differ considerably. The inner one i,s broad and taper- 

 ing and does not reach the tip of the abdomen. The outer one is slen- 

 der and sharpl}" pointed, and extends be- 

 yond the abdomen. In the female the 

 outer branch is not longer than the inner 

 branch. 



The first pair of legs are subchelate, as 

 are also the second pair in the male. In 

 the first pair the propodus is large and 



oval in shape, 

 and bears in 

 the palma a 



row of stifi' bristles at regular intervals 

 and pointing obliquely in the same direc- 

 tion, while a thick row of fine cilia, point- 

 ing obliquely in the opposite direction, 

 cross these almost at right angles. The 

 dactylus terminates in a single hook, at 

 the base of which two smaller hooks are 

 situated. In the legs of the second pair 

 the propodus is irregular in shape with 

 an indication of a rudimentary pollex. 

 There are no hairs or bristles in the palma. 

 The legs of the third, fourth, and fifth 

 pairs present nothing unusual in structure, 

 l)ut resemble the ambulatory legs common 

 to this family. In tiie sixth and seventh 

 pairs the structure is the same as that of 

 the preceding legs of the third, fourth, 

 and fifth pairs, but with an increasing dis- 

 proportion in the length of the propodus 

 and dactylus. In the seventh pair of legs 

 these joints, but more especially the pro- 

 podus, attain a size most conspicuous for 

 their length. The propodus becomes over 

 3i times longer than the carpus which 



Fig. 5.— Tecticeps alascensis. a, 



Leg OF FIRST PAIR OF MALE. X 5|. b. 



Last two joists of same, x lOf . c, 

 Leg of second pair of male, x 5|. 

 d, Leg of third pair, x 5|. e. Leg 

 of sixth pair, x 5|. /, Leg of sev- 

 enth pair. X 5f. 



immediately precedes it. 

 The color varies from dark brown to yellow, more or less dotted 

 with black. In the darker specimens the epimera and the uropods are 

 almost white with scattered spots of black. Other specimens are 

 brown, with markings of red and some are 1)luish-gra3' in color tinged 

 with brown or orange. 



