53 
SERPULA Proteus. 
TAB. DCXXXV — -fig. 2. 
Spec. Char. Attached for a great part of its length, 
smooth, subcyliudricaS, with the base expanded 
and a prominent thin keel along 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. 
The fixed portion of this Serpula strongly resembles 
S. triquetra , but it is smoother, and the straight lines of 
growth distinguish it from 3. avita. A varix is formed 
before the tube rises from its support, and another grows 
round the extremity, in which it agrees with S. ampullacea 
(tab. 597. figs. 1-5.), but it is smaller than that species. 
The individual figured is upon a Plagiostoma spinosa , in 
chalk from Kent. 
SERPULA Ilium. 
TAB. DCXXXV.—; fig. 3. 
Spec. Char. Filiform, slender, smooth, curled up 
into irregular masses; shell rather thick; 
aperture round, its diameter -|pd of a line. 
Syn. Serpula Ilium, Goldjuss, 234. l.69.f. 10. 
Distinguished from Serpula Plexus (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 
Streitberg. 
