STATE GEOLOGIST. 171 



segments in male, four in female. The suture between the first 

 and second segments is not wholly obliterated above in the female. 



Last abdominal segment is deeply and acutely emarginate. 

 Branches oifurca as wide as long, inner bristle plumose, a little 

 longer than abdomen; outer plumose only on outer side, about half 

 the length of the inner. The second to fifth abdominal ser/ments 

 have each a row of spinules along ventral portion of posterior, 



Male with anterior antennae composed of seven joints, the fourth 

 joint very short. The front outer angle of the third is produced, 

 the blunt process bearing three long bristles surrounding a slender 

 olfactory club which is as long as the three following joints. The 

 penultimate joint bears a strong spine or slender appressed process 

 at the middle of its posterior margin. The five outer joints con- 

 stitute the grasping organ. The posterior antennm bear five long 

 bristles at tip, three of which are made prehensile by the occurrence 

 of from eight to twelve short articulations in the middle of the 

 hair, allowing it to be bent forward. At the base of these articula- 

 tions on the outer bristle, are two short spinules. Two nearly 

 longitudinal rows of five or six strong, short spines each appear on 

 the under surface of the outer joint of the antennule. The secon- 

 dary flagellum, borne as usual on the middle of the basal joint, is 

 not articulated, and bears four long bristles, two terminal and two 

 on distal half of inner side. The outline of the mandible is exactly 

 like that figured by Glaus, but it bears about ten teeth, the upper 

 thick and blunt, the inner sharp, slender and longer. Several are 

 notched at tip. The lower angle bears a long simple bristle. 

 Mandibular palpus two-jointed, second joint with three long ter- 

 minal hairs and a shorter spine attached at basal third of anterior 

 margin, jointed at base and directed towards tip, like a dactyl. 

 The maxilla and maxillary palpus are scarcely to be distinguished 

 from those of C. staphylin us. 



The first maxillipeds are three-lobed, the outer lobe constituting 

 a long, strong claw. The second aud third are about one-third as 

 loDg as the first, and bear each one strong simple spine and one 

 weak branched hair. The inner lobe is widest, about two-thirds as 

 wide as long. The dactyl of the posterior maxilliped is spinous on 

 its inner edge, and the same edge of the hand is ciliate and bears a 

 short, stout, sparinajly plumose bristle at its base, just beyond the 

 tip of the closed dactyl. The width of this joint (the second) is 

 nearly half its length. 



Basal joint of inner ramus oi first pair of legs nearly or quite as 

 long as outer ramus, the second wider but only half as long as the 



