40 



of the State of New York, p. 52, also in the Aquarium, Jan. 1894, 

 p. 91, and again in the Fishing Gazetteof May 31, 1894, with references 

 in each case to the original. I am pleased to see thatMr. F. H. H er rick, 

 in the Zoologischer Anzeiger, No. 454, Aug. 13, 1894, p. 29, confirms 

 my observations on times, rates, and on variations along our coasts, etc., 

 even though he does not make it entirely clear why he should prefer 

 to give the impression that my work was first published in the Aqua- 

 rium of January 1894. 



3. Microcrustacea from New Mexico. 



By C. L. Herrick, Professor in Denison Univ. 



eingeg. 30. November 1894. 



The valley of the Rio Grande passes through a region which is 

 by nature almost a desert, although capable of great fertility under 

 irrigation. Although the year is almost rainless there are a few weeks 

 during which copious showers fill such natural reservoirs as exist. In 

 these pools there soon appear large numbers of Phyllopod Crustacea, 

 Apus, Branchipus, ISehalia^ etc. — a fauna sufficiently known through 

 the labors of Professor Packard and others. Among these types 

 which are characteristic of the western plains are a few species of the 

 strictly Microcrustacea which deserve special study. These are chiefly 

 members of the orders Copepoda , Cladocera and a few Ostracodes. 

 Although one would expect a priori a rather limited representation 

 of such types, there is no lack of individuals. The numbers oî Moina 

 which appear in fresh rain pools is enormous, and curiously enough, 

 we find M. rectirostris , M. hrachiata and a third form either asso- 

 ciated in the same pool or in adjacent waters. Moina and several 

 species of Ceriodaphnia may rank with the Phyllopods as »occasiona- 

 list« or desert Crustacea. We were also surprised to find in the less 

 transient pools numerous examples of the American Latonopsis occi- 

 dentalis Birge , which is closely allied with the Australian L. australis 

 Sars. Simocephalus and Scapholeheris with Chydorus and a small 

 Pleuroxis are not uncommon, but a single example of a new species of 

 Daphnia almost completes the list of Cladocera so far encountered. 



The Cyclopidae are represented by C tenuicornis Claus, C. bicolor, 

 C. serrulatus and C. viridis americanus Marsh. No unique species 

 occur, while the Calanidae and Harpacticidae are all new. With these 

 introductory words I beg to pass to the description of a few forms 

 which seem worthy of present notice though all will be illustrated in 

 full in the forthcoming report to the state Zoologist of Minnesota upon 

 the Microcrustacea of Minnesota. 



