354 BULLETIN OF THE 



part produced and depressed about the width of two or three spirals with their 

 interspaces. Operculum as usual. Alt. 5.5, diam. 5.0 mm. 



Habitat. Station 2, in 805 fnis.; Station 20, in 220 fms.; Station 220, near 

 Santa Lucia, in 116 fms., rocky bottom, bottom temperature 58°. 5 F. Off 

 Havana, in 450 fms., Sigsbee. Barbados, in 100 fms. 



This pretty little species is like a L. albicla in miniature, with proportionally 

 finer and more numerous spiral costal, a rounder base, and an aperture bent 

 downward in the adult. 



A full-sized L. albida measures 8.0 mm. high by 7.75 in maximum diam- 

 eter of the base. 



The variations of L. Linnei are parallel with the variations of L. albida (or 

 induta}, the var. limata of the former corresponding to an intensified state of 

 induta var. insculpta. I have, however, not seen any pink variety. 



Family TROCHID^. 



Genus GAZA Watson. 



Gaza Watson, Journ. Linn. Soc., XIV. p. 601, 1879 ; Chall. Kep. Gastr., p. 93, 1885. 

 Type, Gaza dcedala Watson, loc. cit., p. 601, 1879; Chall. Rep., pi. vii. fig. 12. 



Gaza superba Dall. 



Plate XXII. Figs. 4, 4 a. 



Callogaza superba Ball, Bull. M. C. Z., IX. p. 49, 1881. Agassiz, Three Cruises of 

 the Blake, II. p. 68, 1888 (tig. excl.). 



Habitat. Station 153, off Montserrat, in 303 fms., lava sand, bottom temper- 

 ature 48°.75 F.; Station 129, off Santa Cruz, in 314 fms., gray ooze, bottom 

 temperature 48°.5; Station 274, off Barbados, in 209 fms., fine sand and ooze, 

 bottom temperature 53°. 5; Station 275, off Barbados, in 218 fms., fine sand, 

 bottom temperature 52°. 5; Station 281, off Barbados, in 288 fms., ooze, bottom 

 temperature 46° 5. Also by the U.S. Fish Commission in the Gulf of Mexico, 

 between the delta of the Mississippi and Cedar Keys, Florida, Lon. 88° 16' W., 

 in 324 fms., gray mud, bottom temperature 46°. 5 



I included this species with the subgenus Callogaza in my preliminary 

 paper, but the receipt of more specimens from the U. S. Fish Commission 

 dredgings leads me to doubt whether the umbilicus always remains uncovered, 

 and though I have seen no specimens in which it was wholly closed, yet I 

 suspect it becomes so at times. An adult specimen measures 40.0 wide by 

 32.0 mm. high, ajid this appears to be about the average of the species.* 



* Another species of about the same size (38 X 24 mm.), Gaza Rathbuni Dall, 

 which differs from G. superba in being more depressed, with stronger spiral groov- 

 ing, a slightly smaller umbilicus, and more flattened over tlie sutures, has since 

 turned up among the Albatross collections, dredged in the Pacific, at Station 2818, 

 in 392 fms., sand, temperature 44°.0 F., near the Galapagos Islands. 



