Preliminary Keport on Mollusca» 3 



first I supposed it to be a new species, but after having seen 

 more recent and fossil specimens, I have satisfied myself that 

 it is only a variety. 



In „Øvers. af K. Vet. Akad. Forh. 1859" pag. 120 Prof. Loven 

 gives a sketch of the teeth. My observation on this anatomical 

 character agrees on the whole with his. 



Fig 2 & 2* the teeth and jaws. 



P. radiatum (Capulacmæa radiata) M. Sars I believe to be 

 distinguished from P. commodum Midd. 



Cyclostrenia Peterseni n. sp. 



Form oblique-oval, somewhat depressed; whorls 4 very 

 tumid, the last occupying three-fourths of the length ; spire 

 conically rounded; mouth nearly circular; a ledge runs along the 

 inner side of the lip, not far from the opening ; there is no real 

 umbilicus, but an umbilical split. Shell solid, white, smooth and 

 glossy ; microscopical lines of growth are barely perceptible. 



Operculum horny with 7 volutions. 



Size: L 2,5 B. 2,3 mm . 



Radula has 40 joints; formula 1.4 and some 50 lamelles Fig. 3 



Hab: cold area St. 33,510 f. and 87,484 f. 



Rissoa Weyville Thomsoni Jeff. 



Form conic-oval; whorls h\ rapidly increasing, the last of 

 which is large and tumid; spire conic; mouth roundish, occupying 

 half the length of the shell; umbilicus small; structure regular 

 spiral-striæ crossed by stouter and retmoter longitudinal ribs 

 which become folds on the body-whorl, and after having passed 

 half way down, disappear; the body- whorl is sightly angulated; 

 apex, and the first top-whorl smooth; colour white semitransparent. 

 Size: L. 4,6 B. 3,2 ram . 



Radula has 30 joints. Fig. 4 the teeth. 



Hab: Cold area St. 33, 510 f. 87,488 f. and „Porcupine" 

 Expn, 550 f. 



Cerithhim Danielseni n. sp. 



Form elongated pyramidal; 14 — 15 gradually increasing and 

 only slightly convex whorls; suture distinct but shallow; mouth 

 rhomboidical nearly square, ending in a short, broad, abruptly to 

 the left bent canal ; columelle curved ; structure, coarse, prominent 

 longitudinal ribs, there being 18 to 20 on the last whorl, terminating 

 round the periphery in an edge; under side smooth, with fine 



