D. GADUS. Mont. p. 496 1. 14. /. l.Turt. D. p. 

 40. Lin. T. 8. p. 238. D. p. 1067. An D. COARC- 

 TATUM. Desk in Z. I. 4. p. 193. Subpellucid, sub- 

 arcuated, tapering to a small point, pervious, contracting 

 a little towards the larger end, white, glossy, perfectly 

 smooth, f. 0,0622. British Channel, not rare. 



D. TRACHEA. Mont. p. 427. t. 14, f. lO.Turt. 

 D. p. 40. Lin. T. 8. p. 239. D. p. 1068. ORTHO- 

 CERA. T. f. p. 237. Subcylindric, arcuated, ferrugin- 

 ous brown becoming pale towards the smaller end, which 

 is closed, truncated and furnished with a small round 

 protuberance ; marked with regular transverse striae, or 

 aimulations, aperture round, the margin not contracted. 

 . 0, 1 25 Milton in Devonshire, rare, in sand. 



TRIBE. AMPHITRITEAISL'E. 



GENUS. PECTINARIA. 



Tube free, solitary, regular, conical, subcylindraceous, 

 open at both extremities, membronaceous or papyra- 

 ceous, covered externally with grains of sand or 

 minute stones. 

 P. BELGICA. Lam. I. SABELLA. B. Gmel 3749. 



S. GRANULATA ? Lin. 1268. Mont. p. 544. 



S. TUBIFORMIS. Pen 4. t. 92. /. 163. Don. t. 133. 



Simple, straight, gradually tapering, the grains of sand 



