GAZA. 159 



umbilical region, extending from the umbilical carina one-third of 

 the way toward the periphery. The base is covered with numerous 

 revolving threads flattened until their interspaces appear like 

 grooves; the umbilicus similarly formed to the last species, but 

 somewhat more turrited internally. Last whorl less contracted 

 behind the lip, which is not produced forward above, as in superba ; 

 the umbilical callus not nacreous, with a granular surface, white 

 and covering less than half the umbilicus ; lip and aperture other- 

 wise much the same as in superba, but only slightly nacreous. Base 

 waxy white, top the same, with cloudy radiating brown blotches 

 near the suture and on the periphery; some of the revolving 

 threads are also continuously brown. 



Alt. 7'75. maj. diam. 12*5; of umbilicus, 2'5 ; of aperture, 5*5 

 mill. .Deft, about 120. (Dall.) 



Of Havana, Cuba, in 177-200 fms. ; of JBahia Honda, Cuba in 640 



fms. ; of Barbados, in 84-154 fms. 



Callogoza Watsoni DALL, Bull. Mus. Cornp. Zool. ix, p. 50 

 (1881) ; Le. xviii, p. 356, t. 22, f. 7, 7a ; t. 23, f. 1, la; t. 24, f. 2, 

 2a. Margarita filoyyra DALL, Bull. M. C. Z. 1881, p. 42 (young 

 shell). 



This shell named by me Margarita filogyra is without doubt in 

 part based on young specimens of Callogaza Watsoni. But with 

 regard to some of the others I am puzzled as to whether to so refer 

 them or not. In any case, the weight of probability is in favor of 

 their being eventually united. There are certain differences in the 

 umbilicus to which I do not, in the absence of soft parts, feel able 

 to give a definite value ; w T hile the fact that these specimens have a 

 slightly but distinctly thickened lip adds to the obscurity. At all 

 events, whether wholly identical with C. Watsoni or not (Figures 

 11, 12, Plate 48, certainly are), the M. filogyra is in an uncertain 

 state, and for that reason I prefer to omit the name in my list 

 of established species until I obtain more definite material for 

 study. I retain the figures which had been prepared of the sup- 

 posed young shells. 



An adult specimen affords the following notes : The body is yel- 

 lowish, the sides streaked with ashy-gray, a few flecks of which 

 also appear between the tentacles. The body is longer than in 

 Gaza proper and distinctly pointed behind. The tentacles are 

 short and stout, with a small inner angle or expansion opposite the 

 distinct eye peduncle, which bears a large very black eye. The 



