26 CRUSTACEA OF ALABAMA. 



glands are situated on each side of the rami. The function of these glands is supposed 

 to be that of secreting the fluid for forming the shell. 



It has been with much patience and great difficulty that I have succeeded in obtain- 

 ing the male of this species. In it the mucilage glands are of the same structure as those 

 of the female. The copulative organs are situated immediately in front of the post-ab- 

 dominal rami, and are provided with testes of complex structure. On account of the 

 scarcity of this sex, I have been unable to make a complete study of the male organs." 



Cypris dugesi. S P- »■ 



(Plate VI, Fig. 7.) 



Closely related with Cypris virens, with which it exactly agrees in form. Length 

 1.30 mm., height .80 mm. As viewed from the side, oblong-reniform, dorsal margin 

 nearly evenly rounded, but most convex behind, ventral margin moderately sinuous ; 

 higher posteriorly than in front; viewed from above, narrowly oval, acute at both ends, 

 the greatest thickness back of the middle. Valves smoothish, yellow or fuscus. Lucid 

 spots irregular, elongate, lew. 



Anatomy closely resembling C. virens. First antennae with long, somewhat plum- 

 ose setae; longest terminal seta over .32 mm. long; joints of antennae, beginning with 

 the last, measure, .04 mm., .05 mm., .056 mm., .072 mm., .08 mm., .06 mm. Terminal 

 joint with two long and two short setae, penult joint with five or six setae of varying 

 length, three of them being very long, anti-penult segment with two long setae above 

 and two shorter ones below, fourth segment similar, second and third each with two mi- 

 nute setae, basal segment stout, with one or two small setae ; none, of the setae pectinate. 

 The second antennae are stout and rather short, the terminal joint .04 mm. long and 

 conical in form, bearing three toothed claws .15 mm. long and two small spines on the 

 apex; the following joint is .16 mm. long snd bears two terminal toothed claws about 

 .20 mm. long and three longer setae, while before and behind about midway are two 

 small setae ; the third joint from the apex bears six long setae extending beyond the term- 

 inal claws, and one smaller spine on the apex and a sensory club and seta midway be- 

 hind ; the next two joints each have two setae at the apex. 



The jaws are strong and armed with lobed or digitate teeth, the palpus being rather 

 larger than usual. The branchial plate of the maxillae is elongated. 



The terminal claw of the first pair of feet is as long as the whole limb. The second 

 pair of legs are armed at the end with a short claw and a seta. The caudal stylets are 

 about .30 mm. long, armed terminally with a long claw .16 mm. long and a weak spine 

 .06 mm. in length, a second claw springs from the dorsal side a short distance from the 

 end and is .12 mm. long, and a fourth appendage is in the form of a small seta .08 long, 

 about .20 from the base and dorsally situated. This species was founded on specimens 

 collected by Prof. A. Duges, in Guanajuata, Mexico, and by him sent to the National 

 Museum, where they are numbered 9,291. 



From C. virens it differs in the armature of the limbs as well as in size, but may 

 prove a variety. The number and relative length of setae of the first antennae may prove 



