108 THE NAUTILUS. 



valves similarly sculptured. Posterior valve small, having the 

 mucro obtuse and posterior, the posterior slope short, vertical. 



Interior green, marked with black in the cavity. Head valve 

 having the insertion plate about one-third as long as the front slope 

 of the tegmentum, with 5 small slits. Intermediate valves having 

 very oblique plates with 1-1 minute posterior slits. Posterior valve 

 having the insertion plate short and strongly directed forward, with 

 a small slit on each side. Sutural laminte rather long and narrow, 

 projecting far forward. Sinus wide, deep, and square. 



Girdle microscopically chaffy, with a series of hyaline spicules at 

 the edge, and 18 small and compact silvery tufts. 



Length 9 2 ; width 85 mill, (dry specimen). 



Port Jackson, near Sydney. Abundant. Collected by Dr. J. C. 

 Cox. 



GENERAL NOTES. 



Alcyna. — Specimens of the rare Alcyna ocellata A. Ad. are in- 

 cluded in Mr. F. Stearns' last collection of Japanese mollusks. It 

 proves to have a corneous operculum, and therefore belongs to the 

 Trochidce instead of the Fhasianellldip,, where it has hitherto been 

 placed.— IT. A. P. 



S. Australian Mollusc a. — "A Hand List of the Aquatic 

 Mollusca Inhabiting S. Australia" has been issued by D.J. Ad- 

 cock, Adelaide, S. Australia. It will prove very useful to those in- 

 terested in this fauna. 



Contributions to the Natural History of Texas. — I. 

 Texas Mollusca. — By J. A. Singley (Geol. Survey of Texas). 

 A complete list of species known from the State, with useful notes. 

 Mr. Singley's personal researches have covered a large part of the 

 State, but he has supplemented them with citations of Texan locali- 

 ties by other authors, especially Binney and Dall. The paper forms 

 a very useful basis for further operations in the field of Texas conch- 

 ology. 



Report on the Artesian Wells of the Gulf Coastal Re- 

 gion (of Texas). By J. A. Singley (Geol. Survey of Texas, 4th 

 Annual Report). This paper is evidently the result of much care- 

 ful investigation, and will be especially valuable to those interested 

 in Tertiary and Quaternary Geology of the Gulf region. 



