10 



base not at all spread but quite cylindrical, with a 

 central perforation, which sometimes goes quite 

 through, mouth often turning a little upwards, ex- 

 actly circular, riot thinner than the rest of the shell, 

 but appearing as if regularly cut off, with the whorls 

 rising one upon the other, li. on Fuci and Sertularice, 

 Weymouth, fyc. 



S. GRANULATA. SERPTJLA. G. Lin. 1266. D. p. 

 W74.Mont. p. 500. Don. t. IQO.Turt. D. p. 

 150. Lin. T. 8. p. 241. SER SULCATA. Lin. T. 3. 

 p. 254. Opaque, white, with two volutions, deeply 

 grooved longitudinally or in a spiral direction, and 

 transversely wrinkled, especially in the furrows, aper- 

 ture round, -g. Milton, fyc. tolerably common. 



S. HETEROSTROPHA. SERPULA. H. Mont. p. 502. 

 Lin. T. 8. p. 242. D. p. 1075. Turt. D. p. 151. 

 Strong, spiral, dull dirty white, with two or three 

 reversed volutions placed laterally, furnished with lon- 

 gitudinal ridges, one along the back, and another on 

 each side, rough, wrinkled transversely ; base flat and 

 somewhat spreading ; aperture orbicular and invariably 

 placed opposite the suns apparent motion. 0,076. Not 

 uncommon, Kingsbridge bay, fyc. 



S. CARINATA. SERPULA. C. Mont. p. 502. Lin. 

 T. 8. p. 242. D.p. 1074.--7VY. D.p. 151. Dull, 



