52 BULLETIN OF THE 



This very interesting species nearly bridges the gap between typical Volvula 

 {ind Cylichna. Many of the worn or unfinished specimens show hardly a trace 

 of an apical process ; with the best developed ones it is only a raised point 

 barely as high as the elevation of the outer lip beyond the apex, and never a 

 spine as in the other species. There is something about its form and facies, 

 however, which indicates its relationship even when the point is absent. 

 Apart from the spine it is perhaps nearer V. Bushii than any of the others, 

 but is more cylindrical, smaller, and has a narrower aperture. The shell 

 seems unusually heavy for its small size when a perfectly mature specimen is 

 examined. 



Family SCAPHANDRIDiE. 



Genus SCAPHANDER Montfort. 



Scaphander punctostriatus Mighels. 



Bulla punctostriatus Mighels, Proc. Best. Soc. Nat. Hist., I. p. 49, 1841 

 Scaphander lihrarius Loven, Index Moll. Seand., p. 10, 1846. 

 Scaphander punctostriatus Verrill, Trans. Conn. Acad., VI. p. 273. 



Habitat. Station 48, Gulf of Mexico, Lat. 28° 47'.5 N. and Lon. 88° 41'.5 W., 

 in 533 fms., bottom temperature 41°. 7 F., and Station 281, near Barbados, in 

 288 fms., ooze, bottom temperature 46°.5 F. 



A single specimen was collected at each of the above stations. 



These specimens exhibit a bluntness at the apex and a more Bulla-like form 

 than the typical ones, and may form a variety davus, distinguished from the 

 type by the above features and by the simple apex, where the axis is prolonged 

 into the outer lip directly without being twisted so as to form a sort of cup, as 

 in the type of the species. 



Scaphander 'Watsoni Dall. 



Plate XVII. Fig. 10. 



Scaphander ? Watsoni Dall, Bull. M. C. Z., IX. p. 99, 1881. 



Habitat. Off Sombrero Island, in 54-72 fms. : Barbados, 100 fms. ; Station 

 20, in 220 fms., off Bahia Honda, bottom temperature 62°.0 F. ; Station 36, in 

 84 fms., bottom temperature 60°. F. ; Station 45, in 101 fms., bottom temper- 

 ature 61°. 7 F.; and Station 290, in 73 fms., Barbados, bottom coral and shell, 

 temperature 70°.7 F. Also off Hatteras, in 63-124 fms., sand, and 324 fms., 

 sand, in the Gulf of Mexico, bottom temperature 46° 5, by the U. S. Fish 

 Commission. 



Adults of this species were taken at Station 2376 by the U. S. Fish Com- 

 mission in 324 fms. The shells alone were received. They are the American 

 analogue of the European Scaphander lignarius, which they resemble more 

 closely than any other species, but from which they can be distinguished by 



