32-i BULLETIN OF THE 



This shell had been occupied by a minute hermit crab, and had the aspect 

 of belonging in deeper water than that from which it was dredged. Notwith- 

 standing its imperfect state, its characters are sufficiently distinct from any 

 described species belonging to the region to identify it under any circumstances. 

 Its superficial aspect is not unlike a small slender brown Opalia Wroblewskyi 

 (= 0. borealis Gould, non Beck), though the ribs are more regular and more 

 elevated, but placed under a strong lens the minute sculpture comes out with 

 distinctness, and the resemblance to 0. Wroblewskyi is lost. It is related to 

 0. longissiina Seguenza, of the Italian Tertiary, but is more cylindrical and 

 slender, with fewer more pronounced and straighter transverse ribs. 



Scala (Opalia) discobolaria n. a. 



Plate XVIII. Fig. 3. 



Shell with six or more stout rounded whorls, rather rapidly enlarging; 

 sculpture, in a transverse sense, consisting of (on the sixth whorl sixteen) 

 stout rounded ribs, with interspaces not channelled, and extending from suture 

 to suture ; surface granulose or porous, with, in the (somewhat worn) type, 

 no indication of distinct spiral or reticulate sculpture; base solid, thickened, 

 flattish or slightly convex, with a distinct margin, diskdike, granulose like the 

 rest; the margin is buried in the suture so that it is invisible except on the 

 last whorl ; aperture rounded, small ; color whitish externally, brownish be- 

 neath the white layer. Lon., 6.5; max. lat., 3.0; Ion. of last whorl, 3.0 mm. 



Habitat. Station 20, off Bahia Honda, in 220 fms., bottom temperature 

 62°.0 F. Lat. 23° 2'.5, Lon. 83° 10'.5 W. 



The type is considerably worn and has lost its nuclear whorls, but is per- 

 fectly distinct from any of the species hitherto described from the region. Its 

 strong numerous rounded costal, disk-like base, rounded whorls, granular sur- 

 face, and unniarginated suture will suffice to distinguish it whenever perfect 

 specimens may be obtained. 



Genus ACLIS Lov£n. 



The position of this group does not seem very well established. I have 

 serious doubts as to whether it should be placed in the Seal idee, or referred to 

 the Pyramidellidce, as Jeffreys would have it. The nucleus looks as if it might 

 be in reality sinistral, but turned over so completely and at such an early date 

 as to appear dextral. Observations on the extreme young are necessary to 

 settle tin' question. All that is at present known leaves the matter doubtful. 



Aclis (supranitida Wood var. ?) lata Dall. 



Plate XVIII. Fig. 8. 



Shell like A. supranitida but proportionally wider and with a wider umbili- 

 cus, with the suture less distinct and the whorls less incurved ; color greenish 

 white; whorls, 13. Max. lon. of shell, 5.5; max. lat., 2.25 mm. 



