GASTEROPODA. 121 



rather convex ; the last whorl rounded towards the base, with an obscure encircling line 

 placed a little beneath the middle of the whorl ; aperture not exposed. 



Locality. Scarborough, Westow, and Whitwell ; also in the Cornbrash. (Phillips.) 



Serpula plicatilis, Gold/. Plate XIV, figs, ha, b, c. 



Serpula plicatilis, Gold/uss. 1833. Petref., p. 229, t. 68, fig. 2. 



S. Testa laxd vel curvatd, lateribus subconvexis, laviusculis, costulis arcuatis per paria 

 approximatis; carina continud recta. (Goldf.) 



Shell loose or unwound, irregularly curved, slender, rather convex, smooth ; the sides 

 have little, obscure, closely-arranged, curved costse, not visible upon the majority of 

 specimens ; the dorsal carina is simple, continuous, but not much elevated or conspicuous. 



This minute species was gregareous, a considerable number being clustered upon a 

 small Pec ten. 



Locality. Scarborough. 



Serpula sulcata, Sow. Plate XIV, fig. 6. 



Serpula sulcata, Sow. 1829. Min. Con., t. 608, figs. 1, 2. 



S. Testa sublaxd aut curvatd, lavi, subcarinatd ; carina dorsali laviyatd ; sidcisque 

 angustis carina approximatis ; lateribus subplanis. 



Shell partially unrolled, curved, smooth ; dorsal carina smooth, with a narrow sulcus 

 on each side of it ; sides of the shell rather flattened ; lines of growth visible upon different 

 portions of the surface. 



The mode of growth in this species appears to have been very irregular. In its young 

 state it was flattened at the sides, but subsequently became much more rounded ; and the 

 figure of the aperture is nearly orbicular. 



Locality. Scarborough. Inferior Oolite near Stroud. 



Serpula intestinalis, Phil. Plate XIV, fig. 7. 



Serpula intestinalis, Phil. 1835. Geol. of York., vol. i, p. 110, t. 5, fig. 21. 



S. Testa sublaxd, lavi, compressiuscidd, sulco Iceviter depresso, superne et in/erne sitd. 



Shell smooth, partially unrolled, somewhat compressed above and beneath with a slight 

 longitudinal sulcus in the middle of the two flattened sides. 



This species is destitute of a carina, nor are any lines of growth visible ; the sulcations 

 are only to be seen upon the unrolled portion of the shell. 



Locality. Bath Oolite, Scarborough; also in Oxford Clay and Cornbrash. (Phillips.) 



