310 COLLECTIONS FROM MELANESIA. 



Straits which appears to merit separation at least as a variety, which 

 has the segments of the body, the postabdominal process, and the 

 uropoda covered with a dense golden-brown pubescence ; the process 

 of the penultimate postabdominal segment very long, reaching nearly 

 to the extremity of the outer ramus of the uropoda, and obscurely 

 emarginate at its distal extremity ; the outer ramus straight, sub- 

 acute, and entire, the inner represented by a short but distinct 

 process of the base ; the notch in the terminal segment deep, with a 

 prominent triangulate median process. This I will designate 

 C. latreUlei, var. longispina. I have observed specimens of the 

 preceding variety which nearly resemble this in the form of the 

 terminal notch with its median lobe. From Cillccea tenuicaudata 

 and 0. crassa, Haswcll, which this form resembles in the greatly 

 elongated postabdominal process, it is distinguished by wanting the 

 two prominences of the terminal segment, and by the entire longer 

 ramus of the uropoda. 



Ciliccea antennalis*, from Swan River, is nearly allied to Ciliccea 

 latreUlei, but may be distinguished by the nearly smooth body, the 

 form of the thoracic segments, which are subtruncated on the sides, 

 the much wider, shallower, transverse notch of the terminal seg- 

 ment, which has a very small median prominence, and the form of 

 the process of the penultimate segment, which projects far beyond 

 the distal end of the last segment, is vertically compressed, rounded 

 at the distal end, and marked with a longitudinal median groove ; 

 the median frontal process, which is indexed and lies between 

 the bases of the antennules, is truncated at its distal end, where 

 it is applied to the anterior margin of the labrum ; the basal joint 

 of the antennules is considerably enlarged, more than twice as 

 long as broad, with a small tubercle at the distal end of its upper 

 margin ; the next joint, which is about half as long, terminates 

 in two spines below the point of articulation with the slender 

 third joint : ambulatory legs very slender ; apices of the uropoda 

 subtruncated and recurved. The type (a male) measures 10 lines 

 (21 millim.) from the front of the head to the end of the postabdo- 

 minal process. 



The genus (or subgenus) Ciliccea, I may note in conclusion, is 

 nearly allied to Ncesa, Leach, and Campecopea, Leach ; but the 

 typical species of Ncesa have the last segment of the postabdomen 

 simply notched (without a median process), and the penultimate seg- 

 ment armed with two or three dorsal processes or spines, and in the 

 typical species of Campecopea the terminal segment is entire. The 

 distinctions between the sexes in this group are so marked that a 

 considerable series is necessary and a careful examination, or 

 distinctions which are merely sexual may easily be taken to be indi- 

 cative of distinct species or even genera. 



* Nessa antennalis, White, List Crust. Brit. Mus. p. 105 (1847) (ined.). 



