Pacific Coast of North America. 185 



The terminal segment of the body has three sinuses, one 

 above another, the two upper openings being heart-shaped. 

 Six teeth are grouped in a series of two each, and are placed 

 in such regularity as to give the appearance of a triple sinus. 

 At the base of tlie upper sinus is a large rounded tubercle, 

 peaked at the top. Tliree double tubercles are also situated 

 at the base of tlie abdomen. The inner branch of the uro- 

 poda is fixed and immovable ; it is broad and pointed at its 

 extremity and extends two thirds the length of the terminal 

 segment. The outer branch is long and slender, broad and 

 flattened above, more rounded and tapering at the extremity, 

 somewhat incurved, and extends a little beyond the end of 

 the abdomen. Its outer edge is crenulate and its under 

 surface armed with four spines. 



The legs are long and slender, all ambulatory, and with 

 dactylus biunguiculate. 



Two specimens were collected at Popoff Island (Aleutian 

 Islands) by Mr. AV. H. Dall at low water. 



Type. No. 22575, U.S. N. M., PopofF Island. 



Another individual was found at Catalina Island, Cali- 

 fornia, by Dr. J. G. Cooper. In this specimen the sixth 

 thoracic segment is also tuberculated. One specimen was 

 found by Mr. Heath at Monterey Bay on the pink coralline 

 at low tide, and is shaded with a delicate pink. In this 

 specimen, on the seventh thoracic segment and the penulti- 

 mate abdominal segment, the tubercles on either side of the 

 median line of tubercles are single instead of double. 



32. Ciliccea caudata gilliana, subsp. n. 



Body slightly attenuated in front. Colour light brown 

 with markings of black. 



Head with anterior margin thickened and slightly produced. 

 Large median point triangularly shaped, on either side of 

 which the frontal margin of the head is broadly lobed. Eye 

 situated at the posterior angle of the head. First pair of 

 antennee reach beyond the posterior margin of the head; 

 first joint of peduncle is oblong; second joint very small; 

 flagelium contains eight joints. The second pair of antennae 

 are broken in the specimens examined. 



The thoracic segments are about equal in length, with 

 short but very broad epimeia, which extend downward 

 laterally, forming an angle with the segments. The last 

 segment is ridged with very low tubercles on its posterior 

 margin. 



'I he first abdominal segment has two suture-lines, indica- 

 tive of coalesced segments, and bears five double tubercles. 



