Pocijic Coast of North America. 183 



moment they are disturbed they roll into a ball and project 

 the exopodite of the last free segment. This is undoubtedly 

 for protection. I have not had time to accurately examine 

 the position nor character of this appendage, but its sharp 

 sword-like nature is readily recognized," 



Type. No. 22572, U.S. N. M. 



This species differs from T. alascensis in having lonp-er 

 antennse and antennulte ; in iiaving a rounded terminal seg- 

 ment, which in that species is very pointed ; in having the outer 

 branch of the uropods as short as the inner, which in that 

 species is much longer ; in having only a gradual increase in 

 the length of the legs, which in that species show such marked 

 disproportions in thepropodus of the sixth and seventh pairs; 

 and in the position of the eyes, which in this species are situated 

 in the median transverse line of the head, while in T. alascensis 

 they are placed in the posterior half of the head. 



15. CiLic^A, Leach. 

 Analytical Key to the Species o/Cilicgea. 



a. Surface of body smooth. 



b. Terminal segment with three sinuses, one 

 above another, the two upper openings 

 heart-shaped. Terminal segment as 

 broad as long. Outer branch of the 

 uropoda armed with four spines, broad 

 and flat at upper end, and tapering to 

 extremity, which does not reach beyond 



the tip of the abdomen 31. C cordata, sp. n. 



b' . Terminal segment with a large sinus, in 

 which are placed six sharp teeth. Ter- 

 minal segment nearly twice as broad as 

 long. Outer branch of the uropoda 



smooth, slender, cylindrical, and reaching [subsp. n. 



much beyond the tip of the abdomen . . 32. C. cordata gilliana, 

 «', Surface of body densely granulated. Ter- 

 minal segment with a quadrangular ex- 

 cayation, in the centre of which is a long 

 tooth 33. C granuloma, sp. u. 



The position of the three following species is somewhat 

 doubtful, since they lack the spine on the penultimate abdo- 

 minal segment, which is characteristic of the genus Ciliccea. 

 It has been noted by Stebbing *, by Miers f, and by Has well \ 

 that with many species of Ciliccea, as well as with some of 

 the other genera of the Sphseromidge, the spine is present and 

 developed in the males but wanting in the females. As our 



* Hist. Crust. 1893, p. 364. 



t Zool. Coll. ' Alert,' 1884, p. 308. 



X Proc. Linn. Soc. New South Wale.«, vi. p. 183. 



