NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 59 



The postnuclear whorls are well rounded and crossed by very strong, 

 rounded axial ribs which render the summit of the whorls and suture 

 wavy. These ribs pass over the periphery of the last whorl upon the 

 base, where they become decidedly reduced. Of these ribs i8 are 

 present upon the third and fourth and 20 upon the last whorl. At 

 irregular intervals some of the ribs become stronger, forming a varix. 

 The intercostal spaces are deep and a little narrower than the ribs. 

 Suture very marked, rendered decidedly wavy by the strong summits 

 of the ribs. Periphery rounded. Base well rounded, marked as indi- 

 cated above by the feeble continuations of the axial ribs. Aperture 

 oval; columella slender, curved, with a mere indication of a fold; 

 parietal wall covered by a callus; outer lip thick. 



The type, U.S.N.M. No. 561662, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 5.5 postnuclear whorls and measures : 

 Length 2.4 mm., diameter i.o mm. U.S.N.M. No. 561663 contains 

 another specimen from the same source, and a third is in the collection 

 of the A.N.S.P. 



I take pleasure in bestowing the name balchi upon this species in 

 recognition of the great amount of help Francis N. Balch has rendered 

 young mollusk students in northeastern America as well as his splen- 

 did studies upon the nudibranch fauna in the same region. 



Genus lOLAEA A. Adams 



i860. lole A. Adams, Ann. Mag. Nat. Hist., ser. 3, vol. 5, p. 300 (not lole 



1844, Blyth, Journ. Asiat. Soc. Bengal, vol. 13, pt. i, p. 386). 

 1867. lolaca A. Adams, Proc. Zool. Soc. London, 1867, p. 310. 



Shell umbilicated, marked by spiral cords and axial riblets which 

 cross the grooves between them. 

 Type : lole scitula A. Adams. 



lOLAEA WAGNERI, new species 



Plate 15, figure 3 



Shell small, conic, cream-yellow. The nuclear whorls are deeply 

 obliquely immersed in the first postnuclear turn above which only the 

 tilted edge of the last whorl projects. The postnuclear whorls are 

 well rounded and marked by three strong subequal spiral cords 

 separated by deep spiral grooves which equal the cords in width. The 

 space between the suture and the first spiral cord is as wide as the 

 rest of the spiral grooves and renders the summit of the whorls 

 decidedly shouldered. The axial sculpture consists of numerous very 

 slender but well-elevated threads not quite so wide as the spaces that 



