265 



lines, breadth 4 lines. 



This rare shell differs from T Tumidus, in the strife 

 being stronger and less numerous ; the volutions are 

 not so much rounded, nor are they flattened at the top 

 as in that species. 



SERPULA, SOLITARIA. Bean. Shell cylindrical, 

 opaque, white, gradually tapering to a point and 

 wrinkled transversely, fixed at the smaller end to 

 Dentularia abietina or Plumularia falcata, round the 

 stems of which it forms four or five volutions, and then 

 projects forward in a straight, (or sometimes) undulating 

 manner to the length of an inch. Far. With the volutions 

 reversed. Common on the coast of Scarborough. 



SERPULA. PLACENTULA. Bean. Shell strong, 

 opaque, white, with three volutions, the outer one with 

 a sharp keel-like ridge which is strongly wrinkled or 

 serrated. Diameter, 4 lines. VAR With the volutions 

 reversed. Found on the same Zoophytes with S. So- 

 litaria and equally common. 



NATICA LIVIDA Bean. Shell smooth, r globular, 

 of a livid greenish colour, volutions five, marked with 

 very fine longitudinal striae ; aperture roundish-oval, 

 outer lip thin, pillar lip white, a little spread and for- 

 ming a small perforation behind it. Diameter 6 lines. 



M 



