I. List of the Species. 



ORDER COPEPODA. 

 FAMILY OALANID^. 

 I. DiAPTOMUS Westw. 



1. D. ARMATUS Herrick. lOtli Rep. Geol. Minn. 233 

 (1882); Final Report, 139 (1884). 



Hah. — Minnesota {Herrick). 



2. D. KENTUCKYENSis Chambers. Jour. Cincinnati See. 

 Nat. Hist, iv, 48 (1881). 



Hob- — Kentucky {Chambers). 



3. D. LEPTOPUS Forbes. Araer. Nat. xvi., 646 (1882). 

 D. longicornis, var. lejjtopus Herrick. Final Report, 140, 



186 (1884). 



Hab. — Massachusetts and Illinois {Forbes). 



4. D. LONGicoRNis Herrick. 7th Rep. Geol. Minn. 90 

 (1879;; Final Report, 140, 141 (1884). 



D. castor Herrick. 10th Rep. Geol. Minn. 221 (1882); 

 Amer. Nat. xiii, 624 (1879). 

 Hab. — Minnesota (Herrick). 



5. D. MiNKETONKA Herrick. Final Report, 138 (1884). 

 Hab. — Minnesota {Herrick). 



6. D. PALLIDUS Herrick. 7th Rep. Geol. Minn. 91 

 (1879); Amer. Nat. xiii, 383 (1879); Final Report, 142 (1884). 



Hab. — Minnesota (Herrick). 



