142 



THE NAUTILUS. 



carinate at the periphery, low-conic, striate and terraced above, sub- 

 angular at base. Whorls 5, slowly widening. Aperture vertical, 

 narrow, trilobed, the outer lip thickened and sub-dentate within, 

 columellar margin thickened. Alt. 2.2, diam. 3.8 mm. 



Chichijima, Ogasawara (Mr. Y. Hirase, No. 8G4). 



HIRASIELLA, gen. nov. Shell small, bullet-shaped, like Euconu- 

 lus or Kaliel/a, polished, sub-perforate, the lip contracted and thick- 

 ened within. The type of this group would be considered a Kaliella 

 were it not for the characters of the peristome, which shows it to be 

 allied to Hirnsea. The young have a thin lip. like Kaliella. 



Hirasiella clara n. sp. Shell sub-perforate, glossy and smooth, 

 yellowish, elevated with convex outlines, bullet-shaped, the periphery 

 rounded, base very convex. Whorls 6|, convex. Aperture shortly 

 lunate, contracted, the lip thickened within. Alt. 3, diam. 3 mm. 



Chichijima, Ogasawara (Mr. Hirase, No. 867). 



Diplommatina dormitor n. sp. Shell similar to D. cassa in shape, 

 but a little larger ; evenly sculptured with delicate, spaced rib-stria?. 

 Whorls 7, the last narrower and ascending as usual. Aperture sub- 

 circular, the peristome continuous across the parietal wall. Colu- 

 mella toothed below, the tooth or fold moderate, ascending, not 

 enlarged within the last whorl. Palatal fold short. Length 3, 

 diam. 1.5 mm. 



Kikaiga-shima, Osumi. Mr. Y. Hirase, no. 870. 



This form has been found fossil in a (post-pliocene ?) deposit con- 

 taining many land shells. It differs from D. cassa in the much 

 shorter palatal fold, and far less developed columellar lamella within 

 the last whorl. Modern species of the same region, such as D. 

 saginata of Oshima, are much smaller. This is the first Diplom- 

 matina known from Kikaiga-shima. 



ALPHEUS HYATT.- 



Alpheus Hyatt died suddenly of heart disease at Cambridge, 

 Mass., Jan. 15, 1902. He was born at Washington, D. C., April 5, 

 1838 ; prepared for college at the Maryland Military Academy and 

 passed a single year at Yale. After a year's travel in Europe he 



1 Taken in part from the excellent memoir by Mr. Samuel Henshaw. Science, 

 Vol. XV., p. 300, Feb. 21, 1902. 



