MUSEUM OF COMPARATIVE ZOOLOGY. 335 



specimens, even as varieties. It is not among the Blake species, but has been 

 received from the Bahamas, Key West, Cuba, Guadelupe, St. Thomas, Porto 

 Plata, St. Martin's, Anguilla, and other West Indian localities, including the 

 Swan Islands off Yucatan. It is the type of the genus and also of Humphrey's 

 undescribed genus Obeliscus, which thus becomes an exact synonym of Py- 

 ramiddla. 



A species of Syrnola or Styloptigma, under the name of S. turritus A. A. 

 Adams, has been received from H. Cuming, as from the West Indies, but this 

 locality requires confirmation. The original locality fov.S. turritus was Japan. 



Genus TURBONILLA Risso. 



Turbonilla (Leach MS.) Risso, Hist. Eur. Me'r. Moll., p. 224, 1826. Type, Turbo 



lacteus Linne. 

 Chemnitzia Orbigny, 1839, not 1850. 

 Turbonella (Leach) Gray, 1857. 



Fortunately for the present completion of this Report, and owing to the use 

 of the trawl rather than the dredge, very few of this genus were obtained. I 

 have been collecting material for some years, and have most of the described 

 American species represented in the collection under my charge, and beside 

 those which I can identify there are at least fifteen, and perhaps twenty, 

 diagnosable forms which appear to be undescribed. It is impracticable to at- 

 tempt, therefore, any revision or review of the species belonging to our region 

 in this paper. 



Those who would go further are referred to Prof. Verrill's papers, Mr. 

 Tryon's very praiseworthy account in his Manual, and the other literature on 

 the subject. Bulletin No. 24 of the U. S. Geological Survey enumerates the 

 species which have been mentioned in connection with the area under 

 discussion. 



Turbonilla belotheca n. s. 



Plate XXVI. Fig. 7 d. 



Shell white, like polished ivory, with a faint yellowish broad band behind 

 the periphery, or all pale yellow brown fading toward the apex; nucleus lost 

 but apparently small and smooth; remainder (fifteen) of the whorls solid, 

 strong with a slightly malleated aspect; spiral sculpture of the finest and most 

 delicate scratches above the periphery, not constant or prominent anywhere, 

 entirely absent from the rounded base and obsolete on the ribs; transverse 

 sculpture of about twenty broad rounded ribs or waves, which disappear without 

 reaching either suture, except on the early whorls; they are nearly straight, 

 especially near the apex; incremental lines evident and somewhat irregular; 

 aperture longer than wide; pillar incurved to form a single well marked plica- 

 tion. Lon. of shell, 14.0; lat. of last whorl, 3.0; Ion. of last whorl, 4.0 mm. 



