422 BULLETIN OF THE 



1.25; of anal end behind the "glans," 0.8 mm. Grooves in the middle part of 

 the shell about sixteen to the millimeter of circumference. 



Habitat. Turtle Harbor, Florida, in 4 fms., Dr. W. H. Rush, U. S. N. 



This very elegant and delicate species is not like any other on the coast. 

 Though much smaller and more cylindrical, it has somewhat the general ap- 

 pearance of the last species, but when examined, instead of the sculpture being 

 rounded threads, it is seen to be of sharp fine incised lines with flat smooth 

 interspaces. 



Dentalium taphrium n. s. 



Shell short, stoutish, slightly curved, pale apple-green, which is so alternated 

 in ill-defined zones of translucency and opacity as to give on a fresh specimen 

 the effect of the silk known as moire antique, though the sculpture is not mod- 

 ified in these zones; sculpture of very fine sharp slightly elevated incremental 

 lines, visible only in the interspaces between the longitudinal threads; the 

 latter are even, squarish, rather flattened threads, with subequal chamielled 

 interspaces, about six threads to the millimeter of circumference; close to the 

 aperture they become faint, and posteriorly every alternate thread is weaker 

 until it disappears. Both orifices are circular, the anal one has the upper, and 

 to a less degree the lower edge gently concavely waved, but without a slit. 

 Generally this end is decollate and circular. Lon. of shell, 17.0; height of 

 arch from chord, 2.4; diameter of aperture, 2.12; of anal orifice, 0.5 mm. 



Habitat. Otf the Carolina coast, in 22 to 52 fms., sand, temperature 67° to 

 78°, at U. S. Fish Commission Stations 2598, 2608, and 2612. Station 2405, 

 in the Gulf of Mexico between the Mississippi delta and Cedar Keys, Florida, 

 in 30 fms., sand. 



A couple of specimens were obtained, dead and white, in 182 fms., coral sand, 

 off Havana, Cuba, by the U. S. Fish Commission. These, though decollate 

 behind, were about nine millimeters longer anteriorly than any of the more 

 northern specimens, without gaining much in diameter. The added part was 

 almost destitute of sculpture. 



Dentalium candidum Jeffreys. 



Dentalium candidum Jeffreys, Ann. Mag. Nat. Hist., p. 153, 1877 ; P. Z. S. 1882, 



p. 658, pi. xlix. fig. 2. 

 Dentalium solidum Verrill, Trans. Conn. Acad., VI. p. 215, pi. xliv. fig. 16, 1884. 



Habitat. Northern Atlantic, Jeffreys, 410 to 1750 fms. N. E. America, 

 Verrill, southward to the Carolina coast, in 843 to 1309 fms. 



This is a cold-water species not obtained by the Blake. Though one would 

 not anticipate it from the figure, (which is made from a very perfect young 

 specimen,) an inspection of Dr. Jeffreys's types shows that his species is iden- 

 tical with that of Prof. Verrill. 



