AKT. 18 SMALL SHELLS DREDGED BY ''albatross '^ DALL 91 



Length of shell, 7; of last whorl, 2; diameter, 1.8 mm. U. S. Nat. 

 Mus. Cat. No. 108088. 



Off Fernandina and Georgia, seven specimens. Bed of the Gulf 

 Stream in 351 to 465 fathoms. 



Named in honor of Dr. W. H. Rush, of the Navy, who made 

 many additions to the fauna of the Florida Strait. 



MATHILDA HENDEESONI, new species 



Shell of moderate size, ruddy brown, with a transparent inverted 

 nucleus of one whorl and eight subsequent whorls; suture closely 

 appressed, obscure; spiral sculpture of a very prominent beaded cord 

 overhanging the suture all the way down the spire, on the last whorl 

 another on the margin of the base; between the suture and the cord 

 on the spire are four or five equal close-set undulated threads, and a 

 few fine intercalary threadlets; within the margin of the base are four 

 or five similar threads; the space covered by this threading on the 

 spire is constricted and that on the base flatfish; axial sculpture of 

 inconspicuous incremental lines; base imperforate, aperture rounded, 

 the outer lip crenulate by the sculpture, thin, simple, the pillar lip 

 short, slightly reflected. Length of shell, 10; of last whorl, 4.5; 

 diameter, 4.5 mm. U. S. Nat. Mus. Cat. No. 333468. 



Off Fowey Light, Florida coast, in 25 fathoms; J. B. Henderson, jr. 

 Also Turtle Harbor, Fla., in 50 fathoms; Dr. W. H. Rush. 



This remarkable and very characteristic species is named in honor 

 of our late colleague, and comes from the same general area as the 

 other species here described, though knowii so far from a lesser depth. 



Genus TUBA Lea 



TUBA JEFFREYSI Dall 



Tubajeffreijsi Dall, Bui!. Mus. Comp. Zool., vol. 18, p. 268, 1889. 



Shell small, short, white, with an inverted smooth nucleus of one, 

 and four subsequent whorls; suture distinct, deep; axial sculpture 

 of numerous thin sharp lamellae crossing the whorls (including the 

 base) with wider interspaces; spiral sculpture of two strong cords 

 near the periphery, behind the posterior cord are two smaller ones 

 between it and the preceding suture, and on the last whorl another 

 on which the suture is laid; on the base are four more, all with wider 

 interspaces reticulated by the axials but not nodulate at the inter- 

 sections; on the last whorl a line spiral thread occurs in some of the 

 interspaces; base evenly rounded; aperture subcircular, with thin 

 margins; behind the arcuate inner lip is a very narrow umbilical per- 

 foration. Length of shell, 6; of the last whorl, 4; diameter, 4 mm. 

 U. S. Nat. Mus. Cat. No. 108086. 



Off Fernandina, 10 specimens. 



