EAST AMERICAN SCAPHOPOD MOLLUSKS. 91 



gray sand and dead coral, temperature 46.3° F. It is from a lot of 10 

 specimens. 



SIPHONODENTALroM (SIPHONODENTALIUM) TYTTHUM Watson. 



Plate 16, fig. 5. 

 1879. Siphonodentalium tytthum Watson, Jouru. Linn. 8oc. London, vol. 14, 



1885. Siphonodentalium tytthum Watson, Challenger Kept. (Scaphopoda) p. 14, 



pi. 2, fig. 5. , 



1897. Siphonodentalium tytthum, Pilsbry and Sharp, Tryon's Man. Conch., vol. 



17, p. 137, pi. 23, fig. 2. 



The shell is thin, very short, very rapidly broadening, and strongly 

 curved The color is white, glossy, but not brilhant; translucent 

 but opaque when dead. It is sculptureless save for faint growth 

 lines The apex has two lateral clefts. 



The tYi)e measures-length, 5.5 mm.; diameter, 1-23 mm. It 

 was taken north of Culebra Island in 390 fathoms by the Challenger 



at Station No. 24. it 



There are no examples in the museum collection, nor have I seen 



specimens of this species. 



siphonodentalium (SIPHONODENTALIUM), species? 



A smcrle imperfect specimen in the National Museum collection 

 of a large species of SipJionodentaJium, suggesting but not referable 

 to S lohatum., I leave unnamed in the hope that better material 

 may 'some time be received that will furnish a positive diagnosis. 

 It is Cat No 161574, U.S.N.M., from Mayaguez Harbor, Forto 

 Kico, in 25 fathoms, taken at the U. S. B. F. Station 6062. 



SffHONODENTALIUM (SIPHONODENTALnJM) VERRILLI. new species. 



Plate 16, figs. 2, 7. 

 A few lots of ScapTiopods in the museum collection labeled by 

 Professor Verrih " S. teres Jeffreys var.," upon careful comparison with 

 Jeffreys's specimens of that species from the eastern Atlantic, col- 

 lected by the Porcupine, prove to be distinct. The following is a 

 diagnosis of the American species: . , , ^, , i , ,i 



The shell is verv smah, thin, slender, slightly but even y cur.ed 

 and somewhat laterally compressed, giving to it an oval section; 

 the aperture is oblique. The apical diameter is very smaU. The 

 color is white, translucent, becoming milky opaque m the anterior 

 portion; the surface has an oily appearance and is not polished 

 It s eitirely sculptureless. The apical characters consist of t.o 

 projecting lateral lobes, separated by deep cuts or slits on the con- 



cave and convex sides. . u -? rv^rv. • 



The type Cat. No. 314844, U.S.N.M., measures-length, 7 mm., 



diameter 8 mm.; arc, 2. It was dredged by the Alhatross at the 



157582°— 20 7 



