92 PROCEEDINGS OF THE NATIONAL MUSEUM. tol.53. 



extending onto the posterior end of the genital segment are two rows 

 of dichotomously branched processes. The upper row of six pro- 

 cesses is a little below the dorsal surface of the abdomen and is still 

 further depressed on the trunk. The lower row of five processes is 

 parallel to the upper one, the last process standing on the median 

 line of the genital segment (vertical median). 



The branching of these processes varies considerably in different 

 individuals, and probably in the same individual at different stages 

 of development; the older the individual the more profuse the 

 branching, the younger the individual the simpler the processes. As 

 might be expected these branched processes furnish excellent anchor- 

 age for various fixed forms of animal and plant life, and they are 

 often found covered with algae or protozoa. The processes in the 

 two rows alternate with one another, and the tip of the abdomen is 

 left free. This tip is slightly bilobed and on either lobe, close to the 

 anus, is a rudimentary anal lamina, destitute of setae. The egg strings 

 are curled into a loose and irregular coil, as described by Kroyer 

 and Nordmann, and are not in a regular convolute spiral as stated by 

 Heller. 



The first antennae are minute, two-jointed and tipped with setae; 

 the second pair are also two-jointed and tipped with a strong chela, 

 the nearly straight claw shutting down behind a catch on the oppo- 

 site margin of the terminal joint. Proboscis in the bottom of a 

 groove on the ventral surface of the head, of softer tissue than the 

 surrounding parts, and apparently capable of being somewhat pro- 

 truded; mouth parts lacking. 



Four pairs oif swimming legs close together in the curve of the 

 neck just behind the head. The basal joints of these legs are 

 rounded oblong, the first two pairs with a basal projection on the 

 inner margin. The rami are usually broken off, but occasionally 

 a leg will be found with the rami intact, when we can see that 

 the first two pairs are biramose, the third and fourth pairs uniramose, 

 the rami all two-jointed and well armed with setae. 



Color (preserved material), the uniform reddish brown character- 

 istic of chitin in alcohol. 



Total length, including the sigmoid curvature, 15 mm. Cephalo- 

 thorax, 1.50 mm. long, 1.50 mm. wide. Neck, 1 mm. in diameter. 

 Genital segment, 2.50 mm. in diameter. 



{sulfanus, like a sultana). 



Remarks. — The discovery of the two pairs of antennae on these 

 specimens necessitates a different interpretation of the knobs found 

 on the ventral surface of the head.^ 



» See Proc. U. S. Nat Mas., vol. 44, p. 252-255. 



