Hungerford: A New Isopod. 177 



remui' arc r(>lati\ ely lar^r and consi.-^t of a ba.^al part of six segments and a 

 flagelhim of from sixty to eifihty segments. Each of the first four segments 

 of the basal ]iart is broader than h)ng. Taken together they are equal in 

 length to th(> fifth segmtmt. wiiicii is a little shorter than the sixth, from which 

 arises the many-segmented flagellum. The mandible bears a large three-seg- 

 mented flattened jialp and two chitin-tipped processes, one a chisel-hke cutting 

 edge and the other bearing from four to seven teeth. 



Thorax: The segments of the thorax are loosely articulated and their 

 lateral margins are fringed with ver^• short, stout setae. All are broader than 

 long. It bears seven pairs of legs, of which the first pair is subchelate. 



The first pair of legs is shorter than the others. In the males the propodus 

 is very large and bears three well-develoi)ed processes, one at the base and 

 two near the distal end. The ba^sal one is bifurcate in some and in others 

 bears instead a strong seta. There are seven divisions to each limb, counting 

 the clawlike terminal one. The propodus is the enlarged fifth division by this 

 count. The limbs bear many strong setse and increase in length from the 

 first to the last. 



Abdomen: The first two segments of the abdomen are short. The so-called 

 third is nearl\- twice as long as wide and carries the uropods, each of wiuch 

 consists of a basal part and two terminal branches. The uropods are longer 

 than the abdominal segment which bears them, the relative length being 5:3. 

 The basal segment is nearly as long as the last abdominal segment, the ratio 

 about 6:7 in the males. The two branches are of very unequal length; the 

 one female possessing inopods had this basal segment 1:3, the inner being 

 much the larger. The relative lengths vary from 3:2 in the female to 4:1 in the 

 male. The inner branch is to the peduncle as 3:4. There is considerable varia- 

 tion in the comparative lengths of these parts. The second pleopod of the 

 male, the first of the female and the third pleojiods of both sexes are unlike 

 those figured by StafYord for C. alnbamensi.<<. 



Holotype, allotype and jiaratypes in alcohol. Kansas University' collection. 



Tiie females are smaller than the males and do not have as well- 

 developad propodi. The sexual dimorphism appears not to have 

 been recorded in the genus heretofore. Another point not mentioned 

 in descriptions is the fact that the females possess the flattened 

 brood pouches or oostegites at the base of the first four pairs of legs. 

 Our specimens were obtained in June, and some of the females bear 

 these plates. 



I asked Mr. Hoffmann, who gathered the material, to submit a few 

 notes relating the circumstances of their collection. His notes in 

 substance follow: 



The cistern frcni which these specimens were taken is about eight 

 feet in diameter and nine feet deep. It contains a square brick 

 filter, resting on the bottom in the center, which measures three or 

 four feet square at base and tapers to its top, some four feet above, 

 where it is just large enougli for a fotn'-inch casing, which extends 



