108 THE NAUTILUS. 



tions in their private copies of the " Land and Fresh Water Mol- 

 lusks of Alaska," that, since it was stereotyped, it has come to my 

 knowledge that Benson proposed some new names for subdivisions of 

 the genus Planorbis as early as 1855, which he seems afterward to 

 have abandoned and which have not been included in the Nomencla- 

 tors. They were published in the Journal of the Asiatic Society of 

 Bengal, and two of them appear to be prior to names adopted by me 

 in the work above cited. Omolodiscus Benson, will therefore take 

 the place of Paraspera Dall (1. c., p. 82), and Helicorbis Benson, of 

 Drepanotrema Crosse and Fischer, 1880. WM. H. DALL. 



PUBLICATIONS RECEIVED. 



SOME WEST AMERICAN SHELLS, including a new variety of 

 Corbula luteola Cpr., and two new varieties of Gastropods. By 

 Mrs. M. Burton Williamson. (Bull, of the South. Gal. Acad. of 

 Sciences, Vol. iv, No. 8, p. 118.) This interesting paper adds sev- 

 eral species to Prof. Keep's list, making the number of species to 

 date from the West Coast 1,377. Corbula luteola var. rosea, Drillia 

 moesta var. maculata, and Calliostoma canaliculatum var. parvum, 

 are described as new. 



ON A LARGE EXAMPLE OF MEGALATRACTUS ARUANUS L. By 

 Charles Hedley. (Records of the Australian Museum, Vol. vi, p. 98, 

 pi. 21 and 22.) This large shell, which the author says "appears 

 to be the largest recent Gastropod," has a weight of ten pounds 

 twelve ounces, with a length of 22% inches, (he loss of the styliform 

 embryo, etc., curtailing its total length by f of an inch. We beg to 

 state that this Australian giant has a rival on our Florida coast, 

 JFasciolaria giyantea Kiener. I have seen a living specimen of this 

 shell measuring 23 inches in length. Mr. Chas. T. Simpson, in his 

 " Contributions to the Mollusca of Florida" (Proc. Davenport Acad. 

 Nat. Sci., v, 51), says : u On the Keys I have seen dead shells two 

 feet in length. The largest Gastropod in the world." C. W. J. 



MOLLUSCS AND BRACHIOPODS OF BALLYNAKILL AND BOFIN 

 HARBORS, COUNTY GALWAY, and of the Deep Water off the West 

 and Southwest Coasts of Ireland. By E. R. Sykes. (Ann. Rep. 

 Fish., Ireland, 1902-03, PI. ii, App. iii [1905].) An interesting 

 faunal list, with copious notes on the various species. 



