Ai!T. 18 SMALL SHELLS DREDGED BY '' ALBATROSS " DALL 33 



SPECIES WITH A SEDENTARY LARVAL STAGE AND A SMOOTH INFLATED WHITE NUCLEUS OF FEW WHORLS 



PHILBERTIA ? PERDECOBATA, new species 



Shell small, translucent white, strongly sculptured, with a nucleus 

 of a whorl and a half and five and a half subsequent whorls; suture 

 distinct, appressed; axial sculpture of (on the last whorl 10, beside 

 the apertural varix) rounded equal ribs with wider interGpaces, cross- 

 ing the whorls but obsolete more or less on the last naif of the last 

 whorl behind the varix; the incremental lines inconspicuous; spiral 

 sculpture of (on the spire 3, on the last whorl 4 behind the suture, 

 and about 16 on the base and canal) sharp threads with subequal 

 interspaces, over riding the ribs; base rounded, canal very short; aper- 

 ture small, ovate, the outer lip heavily varicose with a thin inflected 

 edge; the anal sulcus large, shallow, and rounded, leaving a very 

 feeble fasciole; the inner lip and body callous, the canal short and 

 wide. Length, 8.5; diameter, 4.3 mm. U. S. Nat. Mus. Cat. No. 

 108291. The short one is 7 mm. long. 



Off Georgia, very common, perhaps the most numerous species of 

 the collection, but mostly blackened by manganese. 



The outer lip is so generally defective or immature that I am able 

 to find only one specimen complete out of the whole series, and that 

 one happens to be a whorl shorter than the average specimen. 



None was found off Fernandina. 



PHILBERTIA PERDECORATA, variety? LIONTA, new 



Shell small, slender, elongate, white, with a nuclear apex of two and 

 five subsequent whorls; suture distinct, appressed; the anal sulcus very 

 shallow, the fasciole hardly depressed, obscure, axially wrinkled near 

 the suture; whorls moderately rounded; axial sculpture of (on the 

 penultimate whorl 16) narrow straight ribs with wider interspaces, 

 crossing the whorls on the spire but obsolete or entirely absent over 

 the greater part of the last whorl, which ends in mature specimens 

 with a strong varix; incremental lines feeble; spiral sculpture as in 

 perdecorata but less emphatic, the threads on the spire crenulating the 

 summits of the ribs slightly; mature aperture much as in perdecorata. 

 Length, 11; diameter, 4 mm. U. S. Nat. Mus. Cat. No. 333445. 



Eighteen specimens off' Fernandina and three or more off Georgia. 



This differs from perdecorata in its less emphatic ribs and more 

 feeble sculpture, more numerous ribs, and somewhat more slender 

 form ; it seems to take the place of perdecorata in the material collected 

 oft" Fernandina. However, there are some intermediate specimens. 



PHILBERTIA? EXTENUATA, new species 



Shell small, slender, whitish, with a smooth nucleus of a whorl and 

 a half and six subsequent moderately rounded whorls; suture distinct, 

 24105—271 3 



