SEP 20 \99^ 



Article IV. — The XortU A)iicric<ni ('('iitr()i)(i(ji(l(r Inioiui'iioi 

 to the (roicrd Osj)}ir<i)iticiiiii , LiiiDioccilanns, and Kpin- 

 chura.* By Frederick William Schacht, B. S. 



INTRODrCTIOX. 



Ill Article III. of this Bulletin the writer discussed the 

 North American species of I)l((pfomiis, and in the present 

 paper, in furtherance of the same purpose, the genera O-s- 

 phrantlciDH, L'tiiuiocahiitiis, and Episcliura are treated. In 

 the introduction to the former article was given a short 

 account of the Avork of writers on the K)iio)noiiiraca now 

 included in the family Coitropiujuhf, especially those genera 

 found in Xorth America. No reference is made there to the 

 genera Hetcrocopc and Euriitcmora, since at that time I re- 

 garded the presence of these two genera in North America as 

 rather douhtful. 



The only statement that Hcfcroropc was ever found on this 

 side of the Atlantic is made l)y Cragiii ('88)^. After an 

 enumeration of the genera of fresh- water ('opepo(h{ he says: 

 " Of these eleven genera, four — Diaptonnis, TjiiiDiocdhnnis, 

 C'ljclops, Rjid ('((nthociiiii])tns — have been recorded as common 

 to the Old World and the New. I add Hetcrocopc on the 

 authority of my friend, Mr. William Patten, who informs me 

 that a species is common in Watertown, Massachusetts." 

 This evidence is not sutticient to justifj' the treatment of the 

 genus in this paper. 



In regard to Kiiri/tcinovd (^^Tcinoni - Tcinorelhi) I was per- 

 haps overhasty in my conclusions, but it being now too late 

 to remedy the omission, the following statements must 

 suttice. In his "Final Beport" Herrick ('84) notes the 

 occurrence of Temora ajfinis Poppe in the rivers flowing into 

 the (lulf of Mexico as well as in the brackish waters into 

 which these rivers flow. In the "Crustacea of Alabama" 

 ('S7) he notes, under the name of Temorclla affinis, a species 

 which according to his statement is the same. The flgures of 



*This yjiiper was accepted by the Faculty of the Universiiy of Illinois June 1, 

 1898, as a thesis for the degree of Master of Science in Zoology. 



'The parenthetical figures in the text of this paper refer usually to the bibliog- 

 raphy of Article III., which is, liowever, supplemented by an additional list appended 

 to this discussion. 



