336 BULLETIN OF THE 



Habitat. West of Florida, in 50 fms. Gulf of Mexico, at Station 32, in 95 

 fins. Barbados, in 100 fms. 



This species recalls T. paucistriata Jeffreys, which is smaller, smoother, and 

 much less strongly ribbed. It does not resemble any of the northern species 

 dredged by the Fish Commission, and it is more solid, and has a sleeker ap- 

 pearance than any of the shallow-water species of our coast. 



Turbonilla flavocincta C. B. Adams. 

 Chemnitzia jlavocincta Adams, Contr. Conch., p. 74, 1852. 



Habitat. Barbados, 100 fms. Jamaica, C. B. Adams. Samana Bay, Santo 

 Domingo, Couthouy. 



This pretty and characteristic species has not yet been collected on the coast 

 of the United States. 



Turbonilla interrupta Totten var. fulvocincta Jeffreys. 



Plate XXVI. Figs. 3, 2 b. 



Melanin rufa Philippi, Moll. Sicil, I. p. 156, pi. ix. fig. 7, 1836. 



Odostomia rufa Phil. var. fulvocincta, Jeffreys, P. Z. S. 1884, p. 356. 



Turritella interrupta Totten, Am. Journ. Sci., 1st ser., XXVIII. p. 352, fig. 7, 1835. 



Turbonilla rufa Jeffreys, etc. 



Habitat. Barbados, in 100 fms. Massachusetts, southward on the American 

 coast. Shediak Bay, Nova Scotia, Whiteaves. Fossil in the Post Pliocene of 

 Wando, South Carolina. 



This species is, as claimed by Jeffreys, identical with Philippi's rufa. The 

 specimens pass through the same series of varieties. The form reported under 

 this name from Nova Scotia by Whiteaves is remarkably distinct, taken by 

 itself, but I suspect a connecting series could be obtained. T. Riisei Morch 

 is probably identical. Extremely fine, large, delicately brown banded and 

 finely sculptured southern specimens constitute my T. viridaria. The forms 

 virga and punieea, described and queried by me as varieties of viridaria, are 

 distinct. I have examined many hundred specimens from all parts of the 

 coast, and find the modifications brought about by temperature are wider and 

 more marked than any that occur among individuals from a single locality, 

 and usually of a different kind. The northernmost specimens will always ex- 

 hibit a tendency to loss of sharpness in sculpture, a rudeness in the general 

 aspect, a thinner shell, and thicker and darker epidermis; sometimes a marked 

 decrease in size. Specimens far south from the metropolis of a species are 

 apt to be smaller, more sharply sculptured, brighter colored, with a thinner or 

 indistinct epidermis, and a tendency to abnormality about the coil of the last 

 whorl and the peritreme of the aperture. 



These small shells, when collected from a sufficiently wide geographical 



April 18, 1889. 



