1028 Wisconsin Academy of Sciences, Arts, and Letters. 
imal to them; claws denticulate, both inside and outside. Anal 
spines about 14 clusters of 2-5 diverging spines. Many clusters 
of fine spinules. Eye on ventral side of head with short optic 
nerve; macula nigra minute. Intestine with small median 
coecnm. 
Shell gland has on the whole the daphnid form; the poster¬ 
ior loop is rounded and open. 
Antennule of male long, slender; curved flagellum and base 
firmly united into one piece; row of spinules along distal part. 
Olfactory setae on small papilla or sessile; stout spine-like 
projection near base, extending toward middle line. Simple, 
cylindrical copulatory organs, as in Latona. First foot with 
complex grasping apparatus. 
The following key will show the relations of the species 
of Pseudosida. 
A. Bidentata forms. 
1. Olfactory setae borne on finger-shaped elevation. P. ram- 
osa Daday. 
Daday (’05, p. 218) Paraguay; Stingelin (’06, p. 187) 
Paraguay. 
1*. Olfactory setae sessile on antennule or, at most, borne on 
small elevation. 
2. Postabdomen with median projection on dorsal 
side near apex. P. szalayi Daday. 
Daday (’98, p. 64) Ceylon; Stingelin (’04, p. 
336) Siam, Sumatra. 
2*. Ho median projection on postabdomen. P. biden¬ 
tata Herrick. 
Herrick (’84, p. 20) Southern United States; 
Daday (P. variabilis, ’05, p. 220) Paraguay. 
B. Tridentata forms. 
1. P. tridenta Herrick (’87, p. 33; ’95, p. 147) Southern 
United States; P. tridentata Stingelin (’06, p. 2) 
Paraguay. 
2. P. papuana Daday (’01, p. 42) Hew Guinea. 
