PACKAKD.J PHYLLOPODS OF NORTH AMERICA. 313 



(G. W. Belfrage). Very common at Ellis, Kans., collected by Dr. L. 

 Watson, and at Fort Wallace, collected by Prof. J. Lindalil. It is as- 

 sociated with Strep tocephalus texamis, Thamnocejphalus hrachyurus, JEs- 

 theria compleximanus and mexicana. 



The shell compared with Baird's figure of Limnadia antiUarum, which 

 belongs to this genus, and is closely allied to the present species ; is 

 more rounded oval at each end, the shell being somewhat truncated in 

 the St. Domingo species. 



Species not recognizable. 



Limnadia coriacea Haldeman. Proc. Acad. Nat. Sc. , Phil. 1, 184, 1842. 



" Body lengthened ; swimming branchise extending along three-fourths 

 of the inferior surface, from the neck to the extremity of the tail ; tail 

 crested above with a row of large conical obtuse tubercles ; apex of the 

 shell elevated, and about one-fourth of the length from the anterior ex- 

 tremity; color, light brown ; length, 5 millim.; height, 3; diam., 1^. 

 "Ba&. — Ditches along the Susquehanna, in quiet water." 

 It is difficult to say whether this is a Limnadia or Ustheria, as the de- 

 scription is too brief and inexact to enable us to determine the genus or 

 species. It cannot be a Limnadia, and seems to api^roximate more 

 closely to Usfheria; though it cannot belong to that genus, as the an- 

 tennae are said to be 12-13 jointed. Until some one collects in the local- 

 ities visited by Mr. Kite, we shall be in doubt as to what this form 

 may be. 



Limnadella, novum genus. 



Charles Girard: Ou a new entomostracan of tlie family Limnadidfe, iuliabitiDg the 

 Western waters. Proceed. Academy Nat. Sciences of Philadelphia, vol. vii, 1854, 

 ly55, page 3. 



" Gen, character. — Eye, one. AntenniB subequal, provided upon their 

 inferior side with long and plumose set*, whilst on the upper side there 

 are short, slender, and simple spines. Two elongated, taj^e-shaped 

 jaws. Feet in twenty-four pairs, provided upon their extremities and 

 sides with slender and plumose sette or hairs. A series of si)iny pro- 

 cesses along the posterior half of the dorsal line. Post-abdominal i^late 

 very large. I^Tutritive system phlebenteric. 



" Observations. — This genus difi'ers from Limnadia in being provided 

 with one eye only instead of two. Also by its antennae, the two pairs 

 of which are similar in structure, whilst in Limnadia one pair is smaller 

 than the other. The post-abdominal plate and number of feet will aftbrd 

 other distinguishing characters between Limnadella and Limnadia. 

 From Gyzicus or Estheria it differs, first by the structure of the shell, 

 which in Estheria resembles that of an Area, whilst in Limnadella it is 

 altogether cyproid in its general aspect. There is a marked diiference 

 between these two types in the structure of the antennae, the joints of 

 which are provided on their upper part with numerous spines in Limna- 

 della, whilst in Gyzicus there is but one single spine at the anterior edge. 

 The structure of the feet is likewise dissimilar, being furnished with 

 plumose setse in Limnadella.^^ 



Limnadella Kitei, n. spec. 



'^Specif, character. — Shell: elongated, subelliptical, thickest anteriorly; 

 twice as long as deep; anterior, inferior, and posterior margins regu- 

 larly continuous; upper outline somewhat irregular ou account of the 



