20 BULLETIN OF THE LABORATORIES 



Habitat: Collected by Mr. A. W. Whitby in San Antonio 

 River, Goloid, Texas, March 5th, 1894. 



Candona Crogmaniana, sp. n. 



[ Plate VIII, Figs. 24-33.] 



Length of female, 1.52 mm. Height 0.76 mm. Width 

 058 mm. 



The shell is very thin, so thin that the ova and spermato- 

 zoids are visible through it. It is glossy and is covered with 

 short scattered hairs. These hairs are more numerous around 

 the margins than elsewhere. The shell is greenish yellow in 

 color and numerous vorticellidae are usually attached to it. 



Viewed from the side, [fig. 33] the female is sub-triangular, 

 the caudal third being the highest portion. The caudal, dorsal, 

 and cephalic margins are convex. The ventral margin is slight- 

 ly sinuate, being concave in the middle. 



Viewed from above, [fig. 32] the shell is an elongated 

 ellipse, pointed at both ends. One valve is longer than the 

 other and overlaps it at each extremity. 



The antenna [fig. 25] is five-pointed in the female. Near 

 the proximal end of the lower margin of the first joint there is 

 one elongated filament and one short, pectinated, dagger-shaped 

 filament. The terminal claws are slender, non-pectinated > and 

 long, — longer than the combined lengths of the last three 

 joints. The antenna of the male is six-jointed. 



The mandibular palp [fig. 31] is five-jointed. The first 

 joint is large and bears at the distal angle of its inner margin a 

 short dagger-like seta. [fig. 31] The distal half of this seta is 

 pectinate. The mandibular blade is stout. 



The spines of the first mandibular process of the first maxil- 

 lae are non-pectinated. 



The first foot [fig. 29] is long and slender and is composed 

 of five joints. The second joint is about as long as the next 

 two joints. The third and fourth joints are of about the same 

 length. The fifth joint is the smallest of all. It is conical and 



