356 BULLETIN OF THE 



of G. superba. The margin of the suture in this form is distinctly appressed, 

 forming a narrow border. The operculum has about seven whorls. The um- 

 bilicus is completely floored over. The soft parts are like those of G. superba, 

 but the tentacles are shorter and stouter, the lateral lobes of the epipodium 

 proportionally larger, there is one more lateral process, and the muzzle is not 

 so much expanded laterally at its termination. Max. diam. of base, 25.0; min. 

 diam., 20.0; alt., 16.0 mm. 



Habitat. Station 221, off Santa Lucia, in 423 fms., gray ooze, bottom tem- 

 perature 42°. 75 F. 



We know so little about the limits of variation in this beautiful group that 

 it is with some doubt that I apply a name to these specimens. The difference 

 in form and sculpture, and the distance between Fiji where G. dadala was 

 collected and the Antilles has seemed to me sufficient warrant in this instance. 



The species is dedicated to Dr. Paul Fischer, who by his recently published 

 Manual has laid malacologists under serious obligations. 



Subgenus CALLOGAZA Dall. 

 Callogaza Dall, Bull. M. C. Z , IX. p. 49, 1881. Type, C. Watsoni Dall, loc. at.,p. 50. 



When I first proposed this name I thought it of generic value, now I am 

 disposed to reduce it to the rank of a subgenus. The opportunity of studying 

 a larger number of specimens has led me to modify my ideas of the value of 

 some of the characters. Thus the mucronation so marked in the type specimen 

 of Gaza is due to the impinging on the reflected lip of the angle of the umbili- 

 cal carina. This I find may produce mucronation, or be invisible under the 

 labial callus in different individuals of the same species, and probably in the 

 same individual at different times. The crenate border of the umbilicus in 

 the type is of more importance, and leads the way toward Microgaza, which 

 appears to lack a reflected lip. I regard Gaza and its subgenera as a group of 

 Trochida;, related to Lunella of the Turbinidm on the one hand, and Umbonium 

 on the other. 



Information as to the soft parts will be found under the data for the several 

 species. When other species are examined, the common characters which alone 

 belong to the generic or subgeneric diagnosis can then be eliminated for that 

 purpose. 



Callogaza Watsoni Dall. 



Plate XXII. Figs. 7, 7 a. Plate XXIII. Figs. 1, 1 a. Plate XXIV. Figs. 2, 2 a. 



Callogaza Watsoni Dall, Bull. M. C. Z., IX. p. 50, 1881. 

 Margarita jilogyra Dall, loc. cit., p. 42 (young shell) 



Habitat. Sigsbee, Station 12, in 177-200 fms., off Havana, Cuba. Station 20, 

 in 220 fms., off Bahia Honda, Cuba, bottom temperature G2°.0. Yucatan Strait, 

 in 640 fms. Station 273, off Barbados, in 103 fms., broken shell and coral, 

 bottom temperature 59°.5. Station 2S2, off Barbados, in 154 fms., sand, hot- 



