680 . DEEP WATER MOLLUSKS AND BBACHIOPODS— BALL. voL.xvir. 



lete. Length of the shell (decollate), 18.5; diameter at the i)osterior 

 angle of the aperture, 6; length of the aperture, 8.5 mm. 



Station 3475, in 351 fathoms. No. 127123, U.S.N.M. 



Two somewhat eroded specimens were obtained, one of which con- 

 tained the dried remains of the animal, which could not be extracted. 

 There was no trace of any operculum, and the species can not there- 

 fore be referred to Belci^ while it lacks the deep sutnral sinus of Daph- 

 neUa. Its resemblance to certain Atlantic species of PleurotomeUa is 

 sufficient to indicate the systematic place it should probably occupy. 



The species is near Bela climahis^ Watson, but has a x>roportionally 

 longer aj erture and larger last whorl. It is quite likely that Watson's 

 species should be referred to the same group. Glionella quadruj^lex, 

 Watson, is nearly allied by the shell characters. 



Spergo, new subgenus. 



Shell large, thin, nearly destitute of sculpture, with an unrecurved 

 l^illar, a short, wide, straight canal, a wide shallow emargination repre- 

 senting the anal notch, and generally feeble anal fasciole, except in the 

 very young; a sharp outer lip, unarmed aperture, and Sinusigera 

 nucleus. 



Animal with the muzzle formed by a stout squarely truncated ros- 

 trum opening into a capacious ijharynx, provided internally with a 

 degenerate proboscis not capable of extrusion beyond the oral orifice, 

 with a poison gland and a degenerate radula. Eyes present and func- 

 tional; tentacles low-seated, stout, and clavate; operculum absent; 

 dentition resembling that of Bela. 



This form resembles PleurotomeUa, Verrill, from which it differs in the 

 character of the rostrum and pharynx, in the possession of eyes, in its 

 straight wide canal, and in having a feebler type of verge, anal notch 

 and fasciole. 



SPERGO GLANDINIFORMIS, new species. 

 Plate XXIV, figs. 1, 2. 



Shell large, slender, glaudiniform, with a ty]3ical brown Sinusigera 

 nucleus of three and a half whorls, followed by eight normal whorls; 

 color pale madder brown, more or less zoned in harmony with lines of 

 growth, and with a peripheral and bas*l spiral paler band feebly indi- 

 cated; the pillar in the young stained with a darker brown, or pinkish 

 white in the full-grown shell; spire rather pointed, the apical whorls 

 sculptured with incised spiral grooves below the shoulder and with 

 numerous small oblique riblets over which the grooves run; the space 

 between the shoulder and the suture behind it slightly impressed, 

 smootii, or crossed by distant low sharp wrinkles, very narrow and not 

 corresponding to the^ibs. All this sculi^ture becomes rapidly obsolete, 

 and on the greater part of the shell the sculpture is confined to silky 



