SKRPULA Proteus. 



TAB. DCXXXY—fig. 2. 



Spe'\ Char. Attached for a great part of its length, 

 smooth, subcylindrical, with the base expanded 

 and a prominent thin keel ah)ng the back ; 

 the free p'< rt cylindrical with a small dorsal 

 keel ; a varix round the aperture, which is 

 circular, with a sharp edge ; lines of growth 

 nearly straight. 



1 HE fixed portion of this Sej-pula strongly resembles 

 S. triquetra, but it is smoother, and the straight lines of 

 growth distinguish it from 5. avita. A varix is formed 

 before the tube rises from its support, and another grows 

 round the extremity, in which it agrees with 8. ampxdlacea 

 (tab. 597. figs. 1-.5.), but it is smaller than that species. 

 The individual figtu'ed is upon a Plagiostoma spinosa, in 

 chalk from Kent. 



8ERPULA Ilium. 



TAB. DCXXXV.— /g. 3. 



Spec. Char. Filiform, slender, smooth, curled up 

 into irregular nsasses ; shell rather thick ; 

 aperture round, its diameter ^rd of a line. 



Syn. Serpula Ilium, Goldjuss, 'i31. l.Q^.f. 10. 



Distinguished from Serpiila Plexiis (tab. 598.) by its 

 small size and less gregarious habit. I find nothing to 

 distinguish it from S. Ilium of Goldfuss except it be a less 

 tendency to curl in a spiral direction which he has given 

 as the specific character. 



From the chalk at Portsdown and Gravesend. Gold- 

 fuss has it from the upper beds of the Jura limestone of 

 Streitberf;. 



