MUSEUM OF COMPARATIVE ZOOLOGY. 235 



Simnia piragua n. s. 



Shell remarkably slender, narrow and long, tapering regularly toward the 

 posterior end from a point about one third of (he whole, length behind the an- 

 terior end. Viewed from above the left profile is gently arched like a bow, on 

 the right there is a shallow emargination behind the end of the canal, and the 

 rest of the right-hand profile is almost in a straight line. The back is pale 

 coffee-brown, the tips and slightly thickened margin white. Below, the aper- 

 ture is seen to be very narrow except for a short space anteriorly, behind the 

 above mentioned emargination. There is a slight callus on the body; the colu- 

 mella, if it may be so called, is tinged with rose-pink. Both ends of the shell 

 are slightly recurved; the surface is marked only by lines of growth and a very 

 few faint spiral striae toward the ends. The extreme anterior end of the canal 

 is sharp-edged, the rest is thickened but not reflected. Max. Ion. of shell, 

 23.0; max. lat. of shell (7.0 mm. back from anterior end of canal), 3.0; max. 

 lat. of body, 2.6; of aperture, 1.6 mm. 



Habitat. Living on Gorgonian coral, in 23 fins, water, at U. S. Fish Com- 

 mission Station 2138, between Jamaica and Hayti. 



The soft parts appear in the dried animal to have been nearly black. 



This is the most slender and evenly tapered species known, though not very 

 large. The nearest to it is S. lanceolata Sowerby, from Luzon, and S. piragua 

 is much more slender, especially toward the extremities, which are also much 

 longer in proportion to the enrolled portion of the shell. 



Section NEOSIMNIA Fischer. 



Simnia (Neosimnia) intermedia Sowerby. 



Ovulum intermedium Sby., Spec. Conch., No. 1, p. 9, figs. 32, 33; Tlies. Conch. Ovu- 

 lum, No. 40, p. 479, pi. c. figs. 61, G2, 1848. Reeve, Conch. Icon. Ovuium, pi. 

 vii. figs. 33 a, 33 b, March, 1865. 



Habitat. Station 247, off Grenada, in 170 fms. Honduras Bay (Sowerby). 

 Vera Cruz, Mexico (Strebel). Off Hatteras, in 50-65 fms., sand, U. S. Fish 

 Commission Stations 2595 and 2596. 



This species is reasonably constant in form, but varies very much in size and 

 in the acuteness of the extremities of the shell. Older specimens have these 

 more blunt. The largest and smallest adult shells I have examined measured 

 27.0 and 15.0 mm. in length respectively. Tryon refers 0. obionga of Martini 

 and 0. spelta Dillwyn, non Linne, to this species as synonyms. 



Simnia (Neosimnia) uniplicata Sowerby. 



Ovulum uniplicatum Sowerby, Thes. Conch., p. 478, pi. c. figs. 30, 31, 32, 1848 ; P. Z. S. 



1848, p. 135. Reeve, Conch. Icon. Ovulum, pi. ix, figs. 51 a, 51 b, May, 1865. 

 Amphiperas canadinensis " Morch," Weinkauff, Jalirb. Mai. Ges., IX. p. 178, 1882, 



= err. typog. for carolinensis. 



