147 
MY'TILUS pectinatus. 
TAB. CCLXXXTI. 
Srec. Cuar. Quadrangular, oblong, gibbose, 
longitudinally striated ; slightly curved ; beaks 
produced ; front straight. 
Seemeeene ao 
Tse strie are rather deep, very regular and increas- 
ing in number as they approach towards the front. ‘The 
surface of each valve is rather square, in consequence of 
two obtuse ridges proceeding from the angles of the 
front. 
Not uncommon near Weymouth, where it occurs in 
the Kimmeridge Clay. The larger specimens were lent 
me by Prof. Sedgewick; the smaller by the Rev, John 
Juland. 
