42 BULLETIN OF THE 



Actaeon perforatus Dall. 



Plate XVIII. Fisr. 3. 



ActcBon perforatus Dall, Bull. M. C. Z., IX. p. 96, 1881. 



Habitat. Station 2, 805 fins. 



Only one specimen of this species has been received. It differs from A. 

 exiguus Dkr. of the same region in its very much shorter spire and globular 

 proportions, in its obsolete coluniellar fold, and the strength and uniformity 

 of its punctate sulci. 



Actaeon Danaida Dall. 



Plate XVII. Fig. 13. 



Actceon Danaida Dall, Bull. M. C. Z., IX. p. 96, 1881. 



Habitat. Station 43, 339 fms,, off Tortugas, bottom temperature 45°.0 F. 

 Only one specimen and a fragment wer6 obtained. 



Actaeon incisus Dall. 



Plate XVII. Figs. 1,1b. 

 Actceon incisus Dall, Bull. M. C. Z., IX. p. 95, 1881. 



Habitat. Yucatan Strait, off Cape San Antonio, 640 fms. 



In this, as in the preceding deep-water species, the fold or ridge on the colu- 

 mella is faint, though not entirely absent, and is best seen from the side ; in 

 fact, it is almost invisible in all, except A. melampoides, from in front as the fig- 

 ures on Plate XVII. are viewed. The columella in these figures, however, is 

 drawn as straighter and broader than it really appears ; but in these particu- 

 lars it is very difficult to get a draughtsman who knows nothing of shells to 

 catch the characteristic curves in every instance. 



Genus OVULACT^ON Dall. 



Shell cyprseiform, involute; with an apical perforation, as in Bulla; colu- 

 mella simple, without plaits ; margin of the aperture continuous, simple, thick- 

 ened, the callus on the body elevated, parallel with the outer lip ; aperture 

 narrow, almost linear, slightly effuse at the extremities, as long as the shell. 

 Type 0. Meekii Dall. 



This interesting form resembles an involute Glohiconcha * with perforate apex 

 and thickened aperture, or a rounded Actcnonella without plaits. In the un- 

 plicate series of the AcUeonidce it holds a place analogous to that of Cyprceactceon 

 White among the plicate forms. 



* The G. ovula Orbigny, wiiich I have not seen, but which has been referred to 

 as an immature Cyprcea, may perhaps belong here. 



