132 GEOL. AND NAT. HIST. SUEYEY OF MINNESOTA. 



The mandible is a flattened toothed plate, bearing a two-jointed 

 palp on one side and a blunt process on the other. 



The first maxilliped is short and bears claws and spines. The 

 second maxilliped is simple, three-jointed, and has a claw at the end. 



The first pair of feet are biramose, each ramus being three jointed; 

 the outer ramus is shorter than the inner. The inner ramus of the 

 fourth foot is two-jointed. In the male the inner ramus of the third 

 foot is modified into a sort of grasping organ. The fifth feet are com- 

 posed of two flat joints, larger in the female than in the male. 



The first abdominal segment of the male carries a pair of three- 

 spined processes. The last abdominal segment bears two stylets, each 

 terminated by two long setiB, one being longer than the abdomen and 

 longer in the male than in the female. 



* Cantbocaniptiis illinoisensis Forbes. 

 Plate XXIX, Figs. 1-5. 



This robust and pretty species was first taken near Minneapolis 

 by Mr. A. W. Jones, a student of the University, who found it in a 

 peaty ditch. Forbes' description is appended. 



"Length 1.0 mm. Head and first segment united; five abdominal 

 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 of furca 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 segments have each a row 

 of spinules along ventral portion of posterior. 



"Male with anterior antennfe 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 olfac- 

 tory club which is as long as the three following joints. The penulti- 

 mate joint bears a strong spine or slender appressed process at the 

 middle of its posterior margin. The five outer joints constitute the 

 grasping organ. The posterior antennae 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 articulations 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 secondary 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 out- 

 line of the mandible is exactly like that figured by Clans, but it bears 



