TO l889. n 'l PROCEEDINGS OF THE NATIONAL MUSEUM. 357 



posterior. The sculpture seems essentially similar. • I have not been 

 able to give the time necessary for a critical examination of the soft 

 parts of the two forms. The animal of P. falJclandica was remarkable 

 in one respect. Among the specimens collected at this station, all of 

 which possessed the soft parts, some had well pigmented black eyes, 

 while in others the pigment was absent and the organs therefore must 

 have been useless. The males possess a well marked verge in the vi- 

 cinity of the right tentacle, thus adding to the now very respectable 

 list of Rhipidoglossa which possess an intromittent male organ. 



Subgenus FISSURISEPTA Seguenza, 



Fissurisepta triangulata Dall. 



Puncturella (Fissurisepta) rostrata Watson, Chall. Rep. Gastr., p. 48, PI. IV, Fig. 10, 



1885. Not of Seguenza. 

 Fissuriscpla triangulata Dall, Bull. Mns. Comp. Zool., xvili, p. 404, June, 1889. 



Hab. — Station 2358, off Cozumel Island, coast of Yucatan, in 222 

 fathoms, coral ; and Station 2GG8, off Fernandina, Florida, in 294 fath- 

 oms, gravel ; temperature, 46°.3 F. 



This species is more triangular and erect, less elevated and longer 

 than Segueuza's original rostrata, with typical examples of which the 

 present species has been carefully compared. 



Subgenus RIMULA Defrance. 

 Puncturella (? Rimula) erecta Dall. 

 Puncturella erecta Dall, Bull. U. S. Nat. Mus., No. 37, p. 170, No. 1077, August, 1889. 



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

 apex minute ; nucleus smooth, of a single whorl; radiating sculpture 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, uniform, equally- 

 spaced threads clinging closely to and passing over the radii like cords 

 over a rod; apex at the posterior third, from wbich 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, con. 

 tained in the upper halt of the anterior dorsum ; internally there is no 

 true septum, but a rim of shelly matter like a collar is pushed back be- 

 hind 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 im- 

 pression strong, margin of shell slightly crenulated by the sculpture ; 

 maximum longitude of shell, 10; latitude, 7.5; altitude, G.8 mm . 



Hab. — Station 2601, in 107 fathoms, off Cape Hatteras, North Caro- 

 lina; temperature, G7°.4. 



