384 BULLETIN OF THE 



Section BASILISSA s. s. 



Basilissa alta Watson. 



Basilissa alta Watson, loc. cit, p. 589 ; Dall, Bull. M. C. Z., IX. p. 48, 1881 ; Watson, 

 Chall. Rep. Gastr., p. 100, pi. vii. fig. 8, 1886. 



Habitat. Station 43, in 339 fms.; Station 41, in 860 fins.; Station 163, near 

 Guadelupe, in 769 fms., fine sand, bottom temperature 39°.5 F.; and Station 

 264, near Grenada, in 416 fms., gray ooze, bottom temperature 42°.5 F. 



All these specimens were dead, though one or two were tolerably fresh, while 

 most of them were defective. The sculpture varies between the typical form 

 and the variety oxytoma Watson (loc. cit., pi. vii. fig. 8 a). The size of the 

 specimens is very uniform. 



Basilissa superba was dredged by the U. Fish Commission off the east coast 

 of the United States, south of Hatteras; the exact locality of the specimens was, 

 however, lost. 



Basilissa alta Watson var. delicatula Dall. 



Plate XXII. Figs. 2, 2 a. 



Seguenzia delicatula Dall, Bull. M. C. Z., IX. p. 48, 1881. 



Habitat. Station 2, in 805 fms. 



This is more delicate and thin than the type, but otherwise much like it, ex- 

 cept that the delicate spiral threads cover the whole surface of the shell. 



The reference of this form to Seguenzia was an error into which I was led 

 by the imperfect state of my specimens and the absence of any others for 

 comparison. 



Section ANCISTROBASIS Dall. 

 Basilissa (Ancistrobasis ) costulata Watson. 



Plate XXIII. Figs. 4, 4 a. 



Basilissa costulata Watson, loc. cit., p. 600; Dall, Bull. M. C. Z., IX. p. 48, 1881 J 

 Watson, Chall. Rep. Gastr , p. 103, pi. vii. fig. 11, 1886. 



Habitat. Yucatan Strait, in 640 fms.; Station 50, 119 fms.; Sand Key, in 

 15 fms. 



Basilissa costulata var. depressa Dall. 



The shell figured differs from B. costulata, as described and figured by 



Watson, in the less flexuous radiating costse, which are nearly equal to the 



interspaces in width, and in the smaller number of spiral ridges, which are 



about ten on the base and seven to nine on the upper surface of the whorls. 



May 4, 1889. 



