288 TROCHID.E. 



sparsely ciliated : eyes proportionally large, black, placed on 

 very short pedicles : foot somewhat rounded at each end ; front 

 corners curved, ear-shaped, broad and flat: appendages 3 

 or 4 on each side, filiform, and finely ciliated like the ten- 

 tacles. (Clark). 



Shell globular, thin, transparent and glossy: sculpture, 

 numerous fine spiral or revolving striae, and occasional scratch- 

 like and more minute lines of growth : colour clear white : 

 spire raised, but blunt: whorls 3, very tumid, rapidly en- 

 larging : suture deep : mouth slightly angular above ; peristome 

 somewhat reflected on the inner or columellar side : umbilicus 

 narrow, oblique, exposing only the base of the last whorl: 

 operculum having from six to eight volutions, microscopically 

 and irregularly striated across in an oblique direction. L. 0*04. 

 B. 0-04. 



Habitat : Coralline zone, 15-40 f. at Guernsey and 

 Lulworth (J. G. J.); Falmouth (Webster and Hockin); 

 Fowey, abundant (Barlee); Exmouth (Clark andBarlee); 

 Skye, a single but characteristic specimen (J. G. J.). 

 I noticed this exquisite little gem in Mr. M^Andrew^s 

 collection, from his Mediterranean dredgings ; and Pro- 

 fessor Lilljeborg gave me at Upsala two specimens of an 

 extraordinary size (about a tenth of an inch in length 

 and diameter) which he had dredged at Bergen and 

 Cliristiansund. 



The animal is described by its discoverer, Clark, 

 as exceedingly active and rapid in its movements. 

 Occasionally the shells of this and the next tiny species 

 are found pierced by some of the smaller canaliferous 

 mollusks. 



I at one time believed that the present species was 

 the Trochus exilis of Philippi ; but I now doubt it. 

 The peristome of that shell is represented in his figure 

 as disconnected ; in ours it is continuous. The two 

 species ^re alike in other respects. 



