NO. IO MOLLUSKS BARTSCH AND REHDER 5 



nants of the periostracum remaining, the living mollusk has its shell 

 covered by a hairy golden coat. The inside of the aperture is bluish 

 white, the inner edge of the outer lip showing a series of dark spots 

 that have dark brown centers and paler edges. Early whorls eroded. 

 The early turns of those remaining have a strong keel on the middle, 

 which is produced by the fact that the summit of succeeding turns 

 falls anterior to the shoulder. This keel is finely nodulose on the early 

 whorls, the nodules gradually disappearing on the later turns. The 

 keel itself becomes less marked on the later whorls where the summit 

 of the succeeding turns approaches the angulated shoulder. The 

 sculpture of the summit of the whorls consists of retractively curved 

 incremental lines and some obsolete spiral striations. The sides of the 

 last whorl are marked by lines of growth and obsolete spiral lirations, 

 which develop into rather strong low spiral cords on the basal third. 

 Aperture narrow, decidedly channeled anteriorly and posteriorly ; 

 outer lip protracted in the middle. 



The type, U.S.N.M. no. 472521, has 10 whorls remaining and mea- 

 sures : Length, 33.6 mm. ; greater diameter, 15.3 mm. ; lesser diameter, 

 13.7 mm. It was dredged in Magdalena Bay, Lower California, in 

 ro-15 fathoms on sandy, weedy bottom, at the entrance to the bay 

 between Belcher Point and the anchorage. 



This cone is related to Conns regular is Sowerby, from which it is 

 distinguished by its higher spire and the light median bands of the 

 body whorl. 



MARGINELLA ROOSEVELTI, n. sp. 

 Plate 1, figs. 2-3 



Shell large, ovate, shining, dorsal part deep brilliant orange with 

 two faint spiral bands of a paler shade, fading to flesh-color with an 

 orange flush, on the ventral side. In addition to this, 5 reddish chest- 

 nut-colored spots are present, distributed as follows : 1 at the apex, 

 1 on the back of the columella a little above the lip, 1 on the middle of 

 the base, 1, the largest, a little posterior to the middle of the outer lip, 

 and the fifth, also strong, halfway between this and the basal spot. 

 The outer lip is thickened and white, excepting the 2 spots. Aperture 

 narrow, decidedly channeled anteriorly and slightly so at the posterior 

 angle. The columella bears 4 oblique folds on its basal two-fifths. 

 The entire surface is glassy and devoid of sculpture. 



The type, U.S.N.M. no. 472610, comes from a tide pool at Old 

 Providence and measures : Length, 23.0 mm. ; greater diameter, 

 13.3 mm. ; lesser diameter, 11.2 mm. 



