ART. 18 SMALL SHELLS DREDGED BY " ALBATROSS " BALL 123 



LISSOSPIRA VALVATA, new species 



Shell small, white, smooth, polished, with about four well-rounded 

 whorls, separated by a distinct but not deep suture; spire only mod- 

 erately elevated, the nucleus small, glassy; base rounded, smooth, 

 with a small perforate umbilicus; aperture circular, slightly oblique, 

 the margins simple, thin, except that the inner lip near the umbilicus 

 is slightly reflected and thickened; some of the immature specimens 

 show a slight angulation around the umbilical depression. Height, 

 2 mm.; diameter, 2.6 mm. U. S. Nat. Mus. Cat. No. 108129. 



Off Fernandina and Georgia, abundant. 



This resembles L. depressa but is larger, the whorls more regularly 

 enlarging and one more in number. 



The small shells which have been included in Cyclosirema, Adeorhis, 

 Vitrinella, and so on by authors, undoubtedly belong to a consider- 

 able variety of groups. Their proper reference in classification 

 must be tentative until their anatomy and other characters than 

 those of the shells are definitely known. 



Genus GRANIGYRA Dall, 1889 



GRANIGYRA LIMATA Dall 



Cyclostrema {Granigyra) limatum Dall, Bull. Mus. Comp. Zool., vol. 18, p, 



395, 1889; Bull. 39, U. S. Nat. Mus., p. 166, 1889. 

 Granigyra limata Bush, Trans. Connecticut Acad. Sci., vol. 10, pp. 115, 135. 



1897. 



Oft' Georgia and Fernandina, not rare. Blake station 19, in 310 

 fathoms, Gulf of Mexico. United States Fish Commission station 

 2150, near Old Providence Island, in 382 fathoms, ooze, bottom 

 temperature 46° F. 



GRANIGYRA RADIATA, new species 



Shell resembling G. Limata but more closely coiled, the granulation 

 less coarse, with three and one-half whorls, the last whorl much the 

 largest; the suture distinct, not deep, with a fringe-like series of short 

 radiating grooves not reaching the periphery; base rounded with a 

 perforate umbilicus around which fine wrinkles appear on the verge; 

 aperture obovate, somewhat angulated above, the margins thin,suiiple, 

 not reflected. Height, 2.5 mm.; diameter, 2.3 mm. U. S. Nat. Mus. 

 Cat. No. 108138. 



Three specimens oft* Fernandina. 



The radiating sculpture sufficiently distinguishes the species. 



Genus LYDIPHNIS Melvill, 1906=CIRCULUS Busch, 1897, not Jeffreys 1865 



LYDIPHNIS MARGARITIFORMIS. new species 



Shell small, white, with nearly four whorls including a minute 

 globular nucleus, having a general form much resembling Margarites 

 helicinus; whorls moderately rounded, the last much the largest, 



