

WORMS. TESTACEA 65. Serpula. 201 



• Skill not more than the, thirty-sixth of an, inch in diameter, 

 tranfverfely wrinkled, with fometimes a slight ridge along the 

 back. 



fill. S. spirorbis. White, opake, regular, orbicular : 

 whorls slightly channelled above inwardly, gradually 

 decreasing. 



Br. ZcoL fc 91./. 155. Dobqv. t. 9. Da Costa t. 2./. it. 



Shell the eighth of an inch wide, fmooth or slightly Wrinkled, 

 rounded above, flattish underneath, umbilicate in the middle. 



£12. S. granulata. White, opake, clustered, round, with 

 3 elevated ribs on the upper side. 



Donovan Brit. Shells, tab. 100. 



Shell about the size of the last, fpiral but not quite regular, 

 slightly umbilicate, with two whorls. 



61 3. S. heterostropha, Dirtyrwhite, round : whorls with 

 3 ribs, turning in a contrary direction. 



Montague Brit. Shells p. 503 a. 7. 



Shell refembling the last, but is about half the size, with left 

 eminent ribs, and the whorls are placed ia a contrary direction : 

 aperture orbicular. 



614. S. carinata. White, opake, regular: the outer 

 whorl with a reticulate ridge at top. 



Montague Br. Shells p. 502. n. 4. 



Shell about half the size of S. fpirorbis, concave and fometimes 

 pervious in the middle, a little fpreading at the bafe. 



615. S. comtgata. White, regular, rough with trans* 

 verse wrinkles, umbilicate. 



Montague Brit. Shells p. 502. n. 5. 



Shell about the 1 eighth of an inch wide, differing from S. Spiril- 

 lum in being stronger, and not exposing io much of the inner 

 whorls. 



$16. S. cornea. Horn-colour, pellucid, regular, rounded, 

 with 3 whorls. 



Adams Linn, Trans. 5. t. \.f. 33-35. 



GU. S. lucida, Round, quite smooth, pellucid, glossy, 

 vitreous, with the whorls turning in a contrary 

 direction. 



Adams, Linn. Trans. 5. t. \,f. 31.. 32. 



Shell ba.\T a line in diameter, with the whorls fometimes uncon- 

 nected : aperture often .projecting upwards. 



€18. S. reversa. White, subcylindrical, rugged, spirally 

 or irregularly twisted : ai>erture turning in a reversed 

 direction, 



Montague Brit. Shells p. 508, n. 1 1. 



Shell the tenth of an inch wide, tranfverfely wrinkled, fome- 

 times pretty regularly fpiral., fometimes variously twisted, with 

 pbe aperture always reverfed. Probably onJy a variety of S. ver- 

 Siicularis, for the inhabitant is the fame. 



B. Contorted, irregular. 

 619. S. vermicularis. White, cylindrical,, tapering, rug- 

 ged, variously curved and twisted. 



Br. Zool. t. gx.f. 1 58. Da Costa p. 18. tab. 5./. 2. 



Shell from the size of a large thread to that of a Swan's quill, fre- 

 quently clustered, totally affixed to some other fubstance, never, 

 c^rirj^te along the bui, .nhabit&ht with branched fringed tenia- 



