THE NAUTILUS. 



135 



margin. Length 22, height 15, diameter 5, beaks behind an- 

 terior end 6. 



Distribution. — Type locality Forrester Island, Alaska, in 

 50 fathoms. A. N. S., No. 118200. Paratypes are in the Cali- 

 fornia Academy of Sciences and in the collection of the writer. 



In shape of shell forresterensis is about midway between 

 K. grandis Dall and K. glacialis Leach. It differs from 

 grandis in smaller size, lighter structure, greater proportional 

 diameter, more truncate posterior end and in straight or 

 nearly straight hinge-line, the basal curve meeting the pos- 

 terior dorsal margin at an angle a little greater than a right 

 angle. It differs from glacialis in greater size, heavier struc- 

 ture, greater proportional depth, and in prominence of im- 

 pressed line setting off anterior portion of left valve and inset 

 at basal margin, which, however, is less prominent than in 

 K. grandis. 



LOUIS POPE GBATACAP. 



Louis Pope Gratacap, curator of mineralogj 7 and of mollusk, 

 at the American Museum of Natural History, died suddenly on 

 December 14, 1917. Born in Brooklyn, N. Y., November Is 

 1851, he was educated in the College of the City of New York and 

 Columbia School of Mines, graduating from the latter in 1876. 



"Mr. Gratacap has been identified with the American Museum 

 of Natural History since October 1876, when the collections were 

 still housed in the old Arsenal Building. Since the death of 

 Professor R. P. Whitfield, he has been dean of the scientific 

 staff, having been in service more than forty years. During 

 this period he has held successively the positions of assistant 

 curator of mineralogy, assistant curator of geology, curator of 

 mineralogy and conchology and curator of mollusca, the last of 

 these since 1909, when he was placed in entire charge of the 

 mineralogical and conchological collections ' ' . 



Of his many papers upon various subjects, only a few relate 

 to conchology. In 1901 he published a "Catalogue of the 

 Binney and Bland collection of Terrestrial Air-breathing Mol- 

 lusks of the United States and Territories in the American 

 Museum of Natural History, with Enumeration of Types and 



