TROCHUS. 317 



vance knowledge of some kind ; you might then do more 

 than excuse him, and, with no feeling of disparagement, 



" You would say, it hath been all in all his study." 



Philippi described this species in 1836 as Valvata ? 

 striata, in consequence of its occurring in the same 

 deposit with Corbiculafluminalis. He afterwards, how- 

 ever, suspected its being a Delphinula. Wood placed it 

 in his genus Adearbis ; but the typical species (A. sub- 

 carinatus] has a paucispiral and horny operculum, with 

 a lateral nucleus, and is probably allied to Solarium. The 

 specific name striatus is preoccupied by a well-known 

 Linnean species. A. supranitida and A. tricarinata 

 of Wood appear to be fossil varieties of the present 

 species. Requien's Catalogue and Wood's Monograph 

 were published in the same year, 1848. 



D. Spire moderately raised ; base slightly umbilicate in the 

 adult, and perforated in the young : pillar-lip furnished 

 with a strong tubercular tooth. Trochocochlea, Klein. 



MoncApnt<u CTeuSSo. ^ M o n'fforT) 



9. T. LINEA'TUS*, Da Costa. ^. 



Turbo lineatus, Da Costa, Brit. Conch, p. 100, t. vi. f. 7. Troche lineatus 

 F. & H. ii. p. 525, pi. Ixv. f. 4, 5 (as T. crassus.) 



BODY dark-ashcolour, with a greenish tint : mantle thin, 

 yellowish- brown ; lappets leaf-like, the left unequally pecti- 

 nated, and the right plain and usually folded: head semi- 

 cylindrical, rather long, transversely streaked, notched at the 

 front edge ; veil above the tentacles membranous, and ir- 

 regularly digitated or fringed: tentacles slender, bluntly 

 pointed ; they are annulated with purple lines variable in the 

 intensity of their colour, and alternately large and small, some- 

 times interrupted or partly zigzag ; they are clothed with fine 

 short cilia : eyes large, placed on angular stalks or processes, 

 which are more or less tinged with orange : foot oval, with a 

 bluntly pointed tail, closely and finely granulated at the sides ; 

 margin purplish and thickly fringed with short cilia ; dorsal 

 crest jagged ; sole divided down the middle by a whitish line, 



* Decked out. 



