30 



THE NAUTILUS. 



Turbonilla tenuicula Gld. 



Turbonilla torquata Gld. 



Turbonilla tridentata C pr. 



Turbonilla sp ? a few specimens dredged at 15 fathoms were of a 

 light brown color and extremely slender. Held at Washington for 

 further study. 



TurriteUa Cooperi Cpr. 



Venus toreuma Gld., one dead shell. 



Volvula cylindrica Cpr. 



NOTES ON THE MOLLTJSKS OF LILYCASH CREEK. 



BY FRANK C. BAKER. 



Some time ago Mr. J. H. Handwerk and Mr. W. Chadwick began 

 a systematic survey of the little stream known as Lilycash creek, 

 near Joliet, 111., dividing it into sections. Section I extended from 

 the mouth of the creek, where it emptied into the Desplaines River, 

 to the Plainfield road, a distance of about two and one-half miles. 

 Later, they propose to take up section II, which will include the bal- 

 ance of the creek. A list of the species found within that area, 

 which Mr. Handwerk \vas kind enough to submit to me for identi- 

 fication, may be of interest, since the region has afforded several 

 peculiar new species, and is very prolific in Sphoariidae. 



The writer is indebted to Dr. V. Sterki and Prof. H. A. Pilsbry 

 for the identification of several of the species enumerated. 



The following species were collected : 



Sphtfrinni stamineum Conrad. Pisidium sp. Now in the hands 

 Sphterium iilycashense Baker. of Dr. V. Sterki, who believes it 



Sphcerium striatinum Lamarck. to be a new species. 



Sphcerium simile Say. Pisidinm roperi Sterki. 



Sphczrium occidental Prime. Limncea humilis Say. 



Galycidina transversa Say. Limncea desidiosa Say. 



Calyculina truncata Linsley. Plonorbis parvus Say. 



Pisidium viryinicum Gmelin. Pliysa hderostropha Say. 



Pisidium alditum Haldeman. Pleurocera elevatum Say. 

 Pisidium compression Prime. Amnicola limosa Say. 



