SOLA RI ELL A. 313 



ssparate. It seems to have .exhausted the power of sculpture on its 

 graceful habitation. Under the microscope, the sharp transverse 

 lirulre, mounting over the keels, dividing the interspaces, and even 

 ascending the wide umbilicus, are eminently beautiful. Even the 

 operculum is sculptured with delicate waved radiating lines. It 

 has the aspect of an extremely thin Torinia, with a funnel-shaped 

 umbilicus. This is not only bounded by a granular keel, but has 

 three other distant spiral lines crossing the 15rula3. The radiating 

 sculpture is more distant on the upper whorls, where first two, then 

 three keels appear, feuestrated by the liruhe, which afterward 

 become much closer and are sometimes worn away behind the 

 lab rum. ( Carpenter.) 



S. VAXCOUVERENSIS E. A. Smith. Unfigured. 



Shell conical, moderately umbilicated, grayish-white ; whorls 5, 

 slightly convex, with oblique flexuous ribs extending from suture to 

 suture, also obscurely spirally striated ; last whorl obtusely angulated 

 at the middle, rather flattened beneath with four or five concentric 

 sulci at the angle, of which the three uppermost are broader than 

 those below, and the interstices or lirse between them are also stouter. 

 The rest of the flattened base -is arcuately plicated, or, in other 

 words, exhibits the continuation of the costse upon the upper half of 

 the volution, which are interrupted by the sulci at the periphery ; 

 umbilicus smallish, surrounded by a subtuberculated double ridge; 

 aperture subrotund, flattened at the base, iridescent within. Colu- 

 mella a trifle arcuate, somewhat expanded above, and at the lower 

 extremity forming an angle with the base. 



Alt. 62, diam. 6] mill ; aperture, alt. and breadth nearly 3 mill. 

 (Smith.} 



Vancouver Island. 



Trochus (Margarita) Vancouver ensis Smith, Ann. and Mag. N. H. 

 1880, vi, p. 288.' 



In some places, probably where the superficial calcareous layer is 

 thin, the pearly iridescence beneath it is observable. The oblique 

 flexuous costre are about 19 in number on the penultimate, and a 

 trifle more numerous upon the last whorl. (Smith.) 



S. AMABILIS Jeffreys. PL 57, fig. 52. 



Shell pyramidal, moderately solid, semitransparent, of a pearly 

 and partially iridescent luster; sculpture: two spiral ridges or keels 

 on the upper part of each of the last three or four whorls, and one 



