ART. 18 SMALL. SHELLS DREDGED BY '' ALBATROSS '' DALL 89 



the whorls, and more or less nodulous at the intersections with the 

 axial sculpture; besides these there are fine threads between the 

 suture and the posterior cord, and also on the base; the reticulation 

 is only conspicuous between the larger cords; base rounded, imper- 

 forate; the aperture rounded with simple, not thickened margins. 

 Length of shell, 6.5; of last whorl, 3.3; diameter, 3.3 mm. U. S. Nat. 

 Mus. Cat. No. 108090. 



Off Fernandina and Georgia, not rare. Also in 640 fathoms, 

 Yucatan Strait. 



MATHILDA LACTEOSA, new species 



Shell small, white, with a pale brownish periostracum, with a smooth 

 inverted nucleus and about six and a half subsequent whorls; suture 

 narrowly appressed, distinct; the whorls rather evenly rounded, the 

 sculpture rather feeble in comparison with the other local species; 

 axial sculpture of numerous slender threads extending from suture 

 to suture, equal and equally distributed (except on the last whorl) , 

 with wider interspaces; incremental lines inconspicuous, except on 

 the base; spiral sculpture of (on the first three v/horls two, on the 

 later ones three) moderately prominent cords at or near the periphery, 

 and six or eight on the base; these are more or less microscopically 

 pirally striate; there are between and on either side of the peripheral 

 cords smaller spiral threads which form squarish reticulations with 

 the axials; there is no obvious nodulation of the cords; base rounded, 

 imperforate, a minute chink behind the thickened inner lip ; aperture 

 rounded, the margins thin, simple. Length of shell, 10; of last whorL 

 4.8; diameter, 4.5 mm. U. S. Nat. Mus. Cat. No. 333453. 



Off Georgia, one specimen. 



Near N. georgiana but less slender, and with less prominent and 

 slightly different sculpture. 



MATHILDA GLOBULIFERA, new species 



Shell small, subconic, white, with an inverted swollen nucleus and 

 about five and a half subsequent whorls; suture distinct, appressed; 

 spiral sculpture of a prominent peripheral cord with one or two smaller 

 ones on each side of it, on the anterior one on the last whorl the 

 suture is laid; the base is nearly smooth; axial sculpture of numerous 

 rather thick threads, slightly concavely arcuate, and extending from 

 suture to suture with narrower interspaces and little reticulate effect; 

 base rounded, imperforate; aperture rounded, with thin margin. 

 Length of shell, 5.2; of last whorl, 3.8; diameter, 2.4 mm. LL S. 

 Nat. Mus. Cat. No. 108087. 



Off Fernandina, two specimens. 



This species is notable for its relatively very large nucleus and 

 small size. 



