THE NAUTILUS. 53 



Hoffmann (Karsten, Arch. ISol, t. 3, p. 385) subsequent to that of 

 Say. Owing to the slight tinge of doubt which still remained, Des- 

 hayes' specific has been universally retained for the Cyrena except 

 by Herbert and Eenevier (Foss. nummul. suppl. p. 59, 1854). All 

 things considered it would seem best to adopt Conrad's name Sayana 

 for the well known shell to which it has been applied and which 

 extends its range from Prince Edward's Island to Indianola, Texas, 

 and has existed unchanged since the Miocene, 



HYALINIA L.EVIUSCULA N. SP. 



BY DR. Y. STERKI, NE^V PHILADELPHIA, OHIO. 



A few years ago while looking over a parcel of fine drift from the 

 Guadalupe river, gathered at New Braunfels, Texas, I found a small 

 Hyalinia which was evidently new; but upon the few specimens at 

 iand I did not like to publish it. Now, a few weeks ago, Mr. J. A. 

 Singley had the kindness of forwarding me several thousand small 

 shells picked out of a lot of the same drift materials.^ Among them 

 there are several dozen specimens of this form, besides nearly as many 

 Hy. singleyana Pils., hundreds of Hy. tniinisciUa Binn. and a few 

 Hy. miUum Mse. 



Our species is of the size and general appearance of Hy. mlnu- 

 scula, for which it doubtless has been taken, but differs from that 

 species in being more depressed. The spire is entirely flat or very 

 little elevated. The whorls are markedly wider, from the nucleus, 

 in specimens of the same size i-l less in number, Yery gradually 

 increasing, and flatter above and below. The surface appears 

 smooth and polished, and only with a strong magnifier radiating 

 lines are seen, much like those of Hy. radiatula Gray, but also pro- 

 portionately much finer. The umbilicus is rather wider in the 

 adult, and the curvature of the whorl to the umbilicus is quite 

 abrupt, appearing almost angular. The shell is colorless, glossy 

 while fresh, and when weathered, appears more milky Avhite, while 

 minu'<ciila then is more chalky. 



This form is certainly not a variety of Hy. minu-^cula which may 

 be regarded as a " species " at the arbitration of a systematist, but 



^ They are so interesting that a list of them with some notes will be worth 

 publishing in the " NAUTILUS." 



