290 TROCHID^. 



is more correct tlian mine,, wliicL. implies a comparison 

 with species of a different genus. 



3, C. serpuloi'des "^^ Montagu. 



Helix Serpuloides, Mont. Test. Brit. Suppl. p. 147, tab. 21 . f. 3. SJcenea ? 

 divisa, F. & H. iii. p. 161, pi. Ixxiv. f. 4-6. 



Body pure hyaline-white : pallial lobes or neck-lappets of 

 different shapes ; that on the right hand is narrowish, flat, 

 and partially serrated ; the other is shorter, somewhat oval, 

 and plain-edged : Jiead rather long, broad, and finely wrinkled 

 across, having a pale-red or pink disk [the colour of which is 

 perceptible even in the dried animal] : teyifacles flattish, marked 

 lengthwise by a white line, symmetrically and elegantly 

 clothed with long transparent close-set cilia : eyes very large 

 and black, seated on small bulbs : foot somewhat truncated 

 or bluntly rounded in front, having at each of the front cor- 

 ners a long curved linear ear-shaped process : appendages 3 

 or 4 on each side, equidistant, fihform, flattish, shorter and 

 less slender than the tentacles, although equally ciliated; 

 these filaments also issue from bulbs or tubercles : verc/e flat, 

 pointed, and lying horizontally, not projecting beyond the 

 mouth of the shell ; sole not fringed at the edge (Clark). 



Shell depressed, rather thin, transparent, and glossy : 

 sndp)ture, numerous fine spiral striae on the under side; 

 the upper part is quite smooth or very rarely marked 

 with a few indistinct and almost microscopical spiral lines : 

 colour clear-white, with sometimes a light-yellowish tint, 

 which is perhaps derived from a filmy epidermis that is not 

 otherwise perceptible : spire scarcely raised : whorls 3-4, 

 cylindrical, rapidly increasing in size ; the last extremely 

 large in proportion to the rest : suture rather deep : mouth 

 slightly angular or forming a small corner above, in conse- 

 quence of the last whorl impinging on that part of the circle ; 

 it is furnished inside with a narrow ledge in order to receive 

 the operculum ; peristome simple : umhilicus not large, but 

 exposing the whole of the spire : operculum having 6-8 whorls 

 and slightly iridescent. L. 0-02. B. 0-05. 



Habitat : In the laminarian and coralline zones on 

 * Having the aspect of a Serpula. 



