KEY TO THE ENTOMOSTRACA OF COLORADO 297 



stouter, and the last abdominal segment has no spine-lilce process caudad as in staphytinus. [Found also in 

 Nebraska. C. staphylinus is found in both Old and New Worlds-l 



139 (i, 100) Appendages much reduced — only two pairs of trunk appendages 

 present. Small animals (about i.omm.) entirely inclosed in bivalve shell. 

 Poor swimmers, living near bottom. Common in all localities. 



Sub-class OSTRACODA 



I have made no special effort to collect Ostracods; nor have those in my collections been detennined. 

 The following have been reported by Beardsley as occurring in the state: 

 Candona acuminata (Fischer) 

 Cyclocypris laevis (O. F. M.) 

 Cypria mans (Chambers) 

 Cypridopsis newloni B. and R. 

 Cypridopsis vidua (O. F. M.) 

 Cyprinotus grandis (Chambers) 

 Cypris altissima Chambers 

 Erpetocypris olivacea N. and B. 

 lUocypris bradyi Sars 



Important References 



This list includes most of the papers in which records of Colorado species have 

 appeared (marked *) , and a few of the more useful general works on Entomostraca 

 (marked f). 



*Beardsley, a. E. "Notes on Colorado Entomostraca." Trans. Am. Mic. 

 Soc, Vol. XXIII, pp. 40-48, 1902. 



*CoCKERELL, T. D. A. "The Fauna of Boulder County, Colorado. II." 

 Univ. Colo. Studies, Vol. IX, pp. 41-52, 1912. 



*DoDDS, G. S. "Descriptions of Two New Species of Entomostraca from 

 Colorado, with Notes on Other Species." Proc. U.S. Nat. Mus., forth- 

 coming issue. 



fDouwE, C. van. "Copepoda." Susswasserfauna Deutschlands, heft 11, 

 Gustav Fischer, Jena, 1909. 69 pp., 310 text figures. 



fHERRiCK, C. L. "Synopsis of the Entomostraca of Minnesota." Second 

 Report of State Zoologist, 1895. 337 pp., 81 pi. 



*JirDAY, Chancey. "A Study of Twin Lakes, Colorado, with Especial Con- 

 sideration of the Food of the Trouts." Bulletin 26 of the Bureau of Fisheries, 

 pp. 147-78, 1907- 



* . " Studies on Some Lakes in the Rocky and Sierra Nevada Mountains." 



Trans. Wis. Acad., Vol. XV, Part II, pp. 781-93, 1907. 



fKEiLHACK, L. "Phyllopoda." Siisswasserfauna Deutschlands, heit 10, Gustav 

 Fischer, Jena, 1909. 112 pp., 265 text figures. 



fLiLLjEBORG, L. Cladocera Sueciae. Upsala, 1900. 701 pp., 87 pi. 

 *tMARSH, C. DwiGHT. "A Revision of the North American Species of Diapto- 

 mus." Trans. Wis. Accui., Vol. XV, Part II, pp. 381-516, 1907. 



