150 SERPULA. CREEPER. 



pi. 2. f. 11 Donovan, pi. 9. f. ], 2 Dorset Cat. pi. 22. 

 f. 11. 



Shell white, opake, Orbicular, regular, spires four or five, 

 smooth or very slightly wrinkled, rounded and concave oil 

 the upper part and slightly grooved round the volutions, 

 beneath flatfish and somewhat perforated : aperture orbi- 

 cular, sometimes erect or looking upwards, and sometimes 

 one or two of the volutions turn a little upwards : diame- 

 ter the eighth of an inch. 



On stones, shells, and sea-weed, v. v. 



2. Serpula Spirillum. Twisted Creeper. 



Dorset Cat. pi. 19. f. 27 ; * 



Shell glossy white, semitransparent, orbicular, regular : 

 Spires two or three, slightly wrinkled and mostly placed 

 laterally, the base not at all spread but quite cylindrical, 

 with a central perforation which sometimes goes quite 

 through the shell : aperture often turning a little upwards, 

 exactly circular and not thinner than the rest of the shell, 

 but appearing as if regularly cut off, with the volutions 

 ascending or rising one upon another: diameter about a 

 line* 



Variety. With the volutions reversed. 



Serpula sinistrorsa. Montagu^. 504 Walker > f. 13, 14. 



On Fuci, and Sertulariae. v. v. 



3. Serpula minuta. Minute Creeper. 



Montagu, p. 505. no. 9. 



Shell dirty white, opake, orbicular : spires two or three, 

 turning in a contrary direction, rounded at the base, trans- 

 versely wrinkled, with sometimes a slight circular ridge 

 running spirally along the back formed by a small furrow 

 on each side : very minute. 



On the Corallina officinalis. v. v. 



4. Serpula granulata. Granular Creeper. 



Donovan^ pi. 100. 



Shell white, opake, clustered, round, not quite regular : 

 spires two or three, slightly perforated in the middle, 

 . with three raised ribs round the top 5 and wrinkled trans- 

 versely 



