DALL : MOLLUSCA AND BRACHIOPODA. 241 



Scaphander (Sabatina) planeticus Dall, n. sp. 



Shell small for the genus, creamy white, of about four whorls ; spire much more 

 exposed than in the majority of sj)ccies, the edges of all the whorls bciug visible, 

 though in the specimen somewhat eroded ; shell heavy, solid, widest behind, with 

 the spire very low and tlie last whorl with a bluntly rounded shoulder behind 

 which it is obscurely flattened ; last whorl much the largcj^t ; axial sculpture 

 starting from the distinct but shallow suture in the form of small arcuate retrac- 

 tive wrinkles, about four to a millimeter, which soon become obsolete, being hardly 

 visible beyond the shoulder of the whorl ; spiral sculpture of conspicuous close 

 spiral lines of shallow but distinct puuctations, the interspaces being flat and 

 polished ; aperture ample, somewhat patulous, outer edge thin and sharp ; body 

 with a heavy smooth white callus ; pillar arcuate, callous, passing imperceptibly 

 into the anterior margin of the aperture ; gastroliths of exactly the same type as 

 those of S. lignarim. Lon. of shell, 8 ; max. lat., 5.5 mm. 



U. S. S. " Albatross," station 3684. in Mid Pacific, N. latitude 0° 50', W. 

 longitude 137° 54', in 2463 fathoms, ooze, bottom temperature 35° F. U. S. N. 

 Mus. 110,748. 



None of the species with which I have compared this one have the spire ex- 

 posed, but it may well be that this is not a character of extreme importance. The 

 most conspicuous feature of this species, after the exposed spire, is the anterior 

 attenuation of the profile, tlie main part of the penultimate whorl being in the 

 posterior third of the shell. 



CYLICHINELLA Gabb. 



Bullina Risso, Hist. Nat. Eur. Mer., 1826, 4, p. 51 ; not of Fcfrussac, 1822. 

 Cylindrella Swainson, Mai., 1840, pp. 135, 326 (not p. 311) ; not of Pfeiffer, 1840. 

 Cylichna Loven, Index Moll. Scand. Occid., May, 1846, p. 10, Ist sp. C. cylindracea 

 Pennant. Not Ci/lichnus Biirmeister, Handb. Entom., 1844, 4, 171. 



> Cryptaxis Jeffreys, Ann. Mag. N. Hist., 1883, 6th ser., 11, p. 400; not of Lowe, 



1854, nor Reuss, 18G5. 

 ? .Vnestia H. & A. Adams, Gen. Rec Moll., 1854, 2, p. 10. 



> Cylichnella Gabb, Proc. Acad. Nat. Sci. for 1872, Feb., 1873, p. 273 (type Bulla 



bidenUUa Orb.). 

 Didllnella Newton, Syst. List. Edw. Coll., 1891, p. 205. 

 Clistnxis Cossmann, Essais Pal. Comp., 1895, p. 90. 

 Cyolinn Gray, Guide Moll., 1857, 1, p. 195; not of Desliayes, 1850, nor Cyclinus 



Kirby,! Culeoptera, 1837. 



Swainson, in his Malacology, applied the name Cyliudrelln first to the present 

 genus, and secondly to a Cone. In the latter case it may be surmised its use was 

 accidental, perhaps a hetcrophemism for Cylinder. At any rate the latter use is 



^ ince one of these names has to be cliangcd on account of their simil.irity, I 

 would propose for Deshayes's genus the name Koryclina. 



VOL. XLIII. — NO. (3 10 



