248 
rated toward the margins ; muscular impressions very 
large, margin entire; cuticle yellowish brown. 12... 
13. Scotland. According to Mr. Macgillivray 
this is the true Venus Compressa of Montagu and the 
Astarte C. of Fleming: 
Nucuta Nitipa Sowerby Conch. Illus. Nucula 
f. 20. Ovate-subtriangular, smooth, shining white 
with an olive colored cuticle ; anterior slope somewhat 
rounded, posterior nearly straight with a central elevation 
0,05....0,4. Common. North of England. 
Moprota Fasa. Gray —Mytitus F. Chemnitz. f. 
761.—CreNnELLA Decussata Macgil. Ab. p. 229.— 
Moptota GLANDULA. Totten in Sil. J. 26. p. 367. 
jf. 3. ?—Gould Mas. p. 131. f. 87.? Suborbicular, 
transverse, more extended anteriorly, convex, rather 
thin, pellucid, nacreous, radiatingly striated and mar- 
ked with concentric striolz as well as somewhat regularly 
spaced lines or ridges of growth, producing a decussated 
appearance ; umbones prominent, a little curved to one 
side at the point, contiguous and central ; hinge thin, 
with a sinus and thick angular fold in each valve under 
the umbo ; margin crenulated. Scotland and England, 
rare. 
