240 PUNCTURELLA. 



the internal septum is larger and more flattened and prolongations 

 extend from its anterior edges nearly to the anterior edge of the 

 shell. It seems to be very distinct from all the species described 

 by Watson, Jeffreys and Dall. ( Verrill.) 



P. ERECT A Dall. 



Shell stout, erect, high, rather short, white or grayish, reticulated ; 

 apex minute ; nucleus smooth, of a single whorl ; radiating sculp- 

 ture of three series of threads, the strongest alternating with the 

 secondaries and these with the tertiaries, which last are almost hidden 

 under the concentric sculpture, which consists of round, even, uni- 

 form, equally spaced threads clinging closely to and passing over 

 the radii like cords over a rod; apex at the posterior third, from 

 which the posterior slope is straight and steep ; anteriorly the top is 

 arched, then falls steeply to the front edge ; slit elongate, with its 

 outer edges raised, a suture in front continued to the front edge, 

 corresponding to an internal groove which does not indent the 

 margin ; perforation long and narrow, contained in the upper half 

 of the anterior dorsum ; internally there is no true septum, but a rim 

 of shelly matter like a collar is pushed back behind the orifice as if 

 the latter had been made by pushing a pin in from the outside and 

 pressing it backward ; interior of shell white, muscular impression 

 strong, margin of shell slightly crenulated by the sculpture; max- 

 imum longitude of the shell 10, latitude 7'5, altitude 6*8 mill. 

 (Dall.) 



This is one of those intermediate forms which bridge over the gaps 

 between subgenera. It has exactly the sculpture of some varieties 

 of Cranopsis asturiana, but its apex is smaller and more close-set, the 

 form of the shell different, the perforation nearer the apex of the 

 shell, and the shell itself is solid and strong, while the G asturiana 

 is delicate and thin. It is difficult to say whether the present species 

 should be called a Puneturella (s. s.), a Cranopsis or a Rimula. 

 (Dall.) 



Off North Carolina in 107 fms. 



Cranopsis t erecta Dall, Blake Gastrop., p. 405. — Puneturella 

 (f Rimula) erecta Dall. Proc. U. S. Nat. Mus. xii, p. 357, 1889. 



Section Cranopsis A. Adams, 1860. 



Cranopsis Ad. Ann. Mag. N. H. 1860, p. 302, type C. pelex. — 

 Ad. & Sowb. Thes., p. 208. — Sowb. in Conch. Icon. xix. — Watson, 



