216 THE CHICAGO ACADEMY OF SCIENCES. 



group of Lymnseas has been so recently differentiated that generali- 

 zations may well be reserved until a future time, when more definite 

 information is available concerning the distribution of the different 

 races. 



RECORDS. 



UNITED STATES. 



ALABAMA: Boligee, Greene Co. (Hinkley). 



ARIZONA: Salt River at Tempe, Maricopa Co. (Ashmun). 



CALIFORNIA: Bardsdale, Ventura Co. (S. S. Berry); Warner, San Diego 

 Co. (F. W. Bryant) ; Los Angeles Co. (Mrs. A. E. Brush) ; Morena, San Diego 

 Co. (Cass) ; Bixby, Los Angeles Co.; Baird's Lake, Ventura Co. (Hannibal); 

 pond about artesian well, ten miles north of Ontario, San Bernardino, Cal. (Hen- 

 derson). 



COLORADO: La Junta, Otero Co. (G. S. Dodds; Henderson). 



MISSOURI: St. Louis, St. Louis Co. (G. D. Linol). 



KANSAS: Verdigris River, Greenwood Co. (Lea); Topeka, Shawnee Co. 

 (Stearns); Nickerson, Reno Co.; Lawrence, Douglas Co.; Manhattan, Riley Co.; 

 Arkalon, Seward Co. (Hanna). 



LOUISIANA: Grand Cane, De Soto Co. (Vaughan). 



NEW MEXICO: Albuquerque, Bernalillo Co. (Ashmun); McCartys, Val- 

 lencia Co. (Ashmun; Walker); Rio Grande, Paraje, Socoro Co.; Rio Grande, 

 Mesilla, Donna Ana Co. (Cockerell). 



OKLAHOMA: Oklahoma City, Oklahoma Co. (Ferriss) ; Cache Creek, S. W. 

 Oklahoma; Tonkawa, Kay Co. (Isley) ; Woodward, Woodward Co. (Vaughan). 



TEXAS: Dallas, Dallas Co. (E. Hall); Greenville, Hunt Co. (Hanna); 

 Houston, Harris Co.; Dallas, Dallas Co. (Hemphill) ; Rockwall Co. (Ferriss); 

 San Marcos, Hays Co. (Pilsbry and Ferriss) ; San Antonio, Bexar Co.; Houston, 

 Harris Co. (Pilsfory) ; Royse, Rockwall Co. (G. H. Ragsdale) ; Fort Worth, 

 Tarrant Co. (Sampson; Walker); Sabine River, Hunt Co.; Brazos River, Fort 

 Bend Co. ; Colorado River and tributaries, Travis Co. ; mouth of Nueces River, 

 Nueces Co. (Singley) ; Rio Grande, near El Paso, El Paso Co.; Bouldin Creek, 

 Travis Co. ; New Braunfels, Comal Co. ; Cala Creek, Throckmorton Co. ; Jack- 

 son Co. (Smith. Coll.) ; McLennan Co. (Strecker) ; Western Texas (Walker). 



MEXICO. 



LOWER CALIFORNIA: Near San Diego Co., Cal. (Orcutt). 



GEOLOGICAL RANGE: Not recorded. 



ECOLOGY: No definite records have been seen regarding the 

 ecology of this variety. It probably inhabits to a large extent the 

 intermittent streams of the great plains, which are dry for a great 

 part of the year, compelling the Lymnaeas to hibernate. See note under 

 variety cockerelli. 



REMARKS : Techclla may be known by its acutely conic spire, 

 obese body whorl, broadly dilated and flattened inner lip and wide and 

 deep umbilical chink. Cubensis has a narrower, more triangular and 

 Jess broadly reflected inner lip and a narrower umbilical chink. The 



