248 



rated toward the margins ; muscular impressions very 

 large, margin entire; cuticle yellowish brown, li... 

 H. Scotland. According to Mr. Macgillivray 

 this is the true Venus Compressa of Montagu and the 

 Astarte C. of Fleming: 



NUCULA NITIDA 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. 



MODIOLA FABA. Gray MYTILUS F. Chemnitz, f. 

 761. CKENELLA DECUSSATA Macgil. Ab. p. 229. 

 MODIOLA GLANDULA. Totten in Sil. J. 26. p. 367. 

 /. 3.? Gould Mas. p. 131. /. 87.? Suborbicular, 

 transverse, more extended anteriorly, convex, rather 

 thin, pellucid, nacreous, radiatingly striated and mar- 

 ked with concentric striolae 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. 



