TO GEOLOGY. 37° 
GENUS SERPULA. 
S. ornata. Plate 1. Fig. 5. 
’ 
Description. Shell granulate, below furnished with 
three squamose carine. 
Observations. Having a single specimen only of this spe- 
cles, it is difficult to decide on its characteristics. The 
beautiful granulations which cover the superior part, and 
the squamose carine will, I presume, be usually if not al- 
ways found to exist on it. The form, however, of different 
individuals will most likely differ. The one above described 
takes one turn to the right, then three to the left, forming a 
disk, the inferior portion being widely umbilicated. It has 
some resemblance to the granulata (Sowerby), but differs in 
having carine. 
Of the twenty-seven species found in England, two 
only have been discovered in the London Clay. The 
genus seems to have prevailed more extensively in the 
chalk and inferior formations. Fivespecies are described by 
Lamarck, and chiefly from Grignon. In the Upper Green 
Sand of New Jersey and Delaware, Dr Morton has found 
one species. In the Tertiary of Maryland, Mr Say observed 
one, the granifera. 
