300 TROCHID^. 



Sowerby as Margarita undulata, Couthouy as Turbo 

 incarnatus, and Brown as Trochus inflatus. 



\- 3. T. AMA'BILIS*, Jeffreys. 



BODY of a creamy-white hue, faintly speckled or tinged 

 with yellowish-brown : pallial lappets small : head prominent 

 and wedge-shaped at its extremity, which is finely and deeply 

 fringed by about 20 digitations or points of different 

 lengths and sizes, those in front being the largest ; it is semi- 

 circular in front, and expansile like the foot of Nucula or Leda : 

 mouth lobed : tentacles filiform, remarkably long, and tapering 

 to a fine point ; they are flexible and exquisitely setose : eyes 

 conspicuous, set on short oflsets : foot lanceolate, squarish in 

 front, on each side of which it is furnished with two long 

 conical processes, which project at a right angle to the tenta- 

 cles ; it is sharp-pointed behind, and has a prominent trian- 

 gular ridge, extending from the posterior edge of the opercular 

 lobe to the tail : appendages 3 on each side, issuing from 

 beneath the opercular lobe, and between these are a few small 

 papillaB ; the two lateral filaments in front are ciliated, and 

 resemble a second pair of shorter tentacles ; the foot is capa- 

 ble of being expanded to a size double that of the shell, so as 

 to form a broad and solid fulcrum. 



SHELL pyramidal, moderately solid, semitransparent, of a 

 pearly and partially iridescent lustre: sculpture, two spiral ridges 

 or keels on the upper part of each of the last three or four 

 whorls, and one on the upper part of the next or smaller 

 -whorl, besides several finer but irregular ridges on the base of 

 the last or largest whorl, and numerous minute spiral stria? 

 between all the ridges ; the principal ridges are placed near 

 the suture of each whorl, both above and below, leaving a 

 broad flattened space in the middle and a narrow excavated 

 space below the suture, thus imparting a tower-like appear- 

 ance to the shell ; the upper whorls are also marked with nu- 

 merous short and fine longitudinal ribs, which cross the ridgea 

 and make them crenellated : colour pure pearl-white : spire 

 elevated ; apex semiglobose, prominent and slightly twisted : 

 whorls 7, gradually increasing in size : suture very distinct : 

 mouth nearly circular, but angulated or somewhat notched 



* Lorely. 



