300 BULLETIN OF THE 



Leiomya (Plectodon) granulata Dall. 



Neoera granulata Dall, Bull. M. C. Z., IX. p. Ill, 1881. 

 Plate III. FlB. 8. 



Habitat. Off Sombrero, 54 and 72 fms. ; Barbados, 100 fms.; Station 177, 

 off Dominica, in 118 fms., sand, bottom temperature 65° .0 F., and a fragment 

 at Station 272, in 76 fms., coarse sand, off Barbados, bottom temperature 

 64°.75 F. 



The longest specimen measured 18.0 mm., and is pure white. A variety 

 velvetina has finer and much closer set granules, more recurved rostrum, and 

 less sinuated posterior ventral margin; the concentric striae are also a little 

 more prominent. 



The granules are arranged along the lines of growth, and sometimes are 

 elongated in that sense. 



Section RHINOCLAMA Dall and Smith. 



Like the last, but without cardinal teeth. Bhinomya A. Adams, not Des- 

 voidy or Geoffroy. Sections F and G, Smith. Type Necera philippincnsis 

 (A. Adams) E. A. Smith. 



Necera notabilis Jeffreys and Necera semistrigosa Jeffreys, not lamclli/cra 

 Dall, belong here. The last, which is clo.sely simulated as to external char- 

 acters by semistrigosa, proves on comparison to have different hinge characters. 



Necera teres Jeffreys, injiata Jeffreys, and gomerensis Smith, in so far as they 

 represent this type of hinge, belong hereabouts; though Dr. Jeffreys in his col- 

 lection had mixed these with other forms not closely related. 



Leiomya (Rhinoclama) halimera Dall. 



This species, represented by two right valves, is probably correctly placed 

 here. It may best be described comparatively. 



Though larger than any specimen of Z. notabilis Jeffreys, in our collection, 

 it is of exactly the same shape and proportions; except that, instead of being 

 sculptured like L. notabilis, it has the finely concentrically striate and wrinkled 

 surface of L. teres Jeffreys. The hinge has the high and squarish laterals and 

 other features of L. teres, but the anterior lateral is a little longer, the space 

 between the laterals longer, the groove for the cartilage less marked, and the 

 buttress less strong. Lon. 10.0; alt. 6.5; diameter of largest valve about 3.0, 

 and of the valves when perfect probably 6.0 mm. 



The specimens were dredged by the U. S. Fish Commission steamer '* Alba- 

 tross," at Station 2678, in 731 fms., ooze, off Cape Fear, North Carolina, bottom 

 temperature 38°. 7 F., in the winter of 1885-86. 



