M8 Illinois State Lahoratory of Natural History. 



3. A. PYGM.^A Kurz. Dodekas iieuer Cladoceren, 61, t. 

 iii, fig. 7 {im4.).—Herrick. Final Report, 105 (1884). 

 Uab. — Minnesota? {Herrick). 



X. Pleuroxus Baird. 



1. p. AOUTiROSTRis Birge. Trans. Wis. Acad, iv, 99 



{lHTi).—Herricl-. Final Report, 109 (1884). 

 Hah. — Massachusetts (Birge). 



2. P. AFFiNis Herrick. Final Report, 111 (1884). 

 Ifah. — Alabama {HerricJS). 



3. P. DENTiouLATUS Birge. Trans. Wis. Acad, iv, 98, 

 {I'^ll).— Herrick. Final Report, 110 (1884). 



Hah. — Massachusetts, Lake Michigan, and Wisconsin {Birge), Min- 

 nesota and Alabama {JTerricJc). 



4. P. HAMATUS Birge. Trans. Wis. Acad, iv, 98 (1877). 

 —Her rid: Final Report, 1 10 ( 1884 ) . 



ITab. — Massachusetts (iJirg'P), Alabama {ITerrich). 



5. P. PROCURVUS Birge. Trans. Wis. Acad, iv, 92 (1877). 

 —Herrick. 10th Rep. Geol. Minn. 250 (1882); Final Report, 

 113 (1884). 



ITah. — Massachusetts and Wisconsin (Birge), Minnesota {IlerricV). 



6. P. STRAMiNEUS Birge. Trans. Wis. Acad, iv, 94 (1877). 

 —Herrick. Final Report, 108 (1884). 



Hah. — Massachusetts (Birge). 



7. P. UNiDENS Birge. Trans. Wis. Acad, iv, 97 (1877). 

 —Herrick. 10th Rep. Geol. Minn. 250 (1882); Final Report, 

 111 (1884). 



Hah. — Wisconsin (Birge), Minnesota and Alabama (Herrick). 



XL Chydorus Leach. 



1. C. o.^LATUS Schodler. Neue Beitriige zur Naturge- 

 schichte der Cladoceren, 15, t. ii, fig. 44 (IHCy^).— Herrick. 

 Final Report, 117 (1884). 

 ITah. — Minnesota (Herrick). 



