MARINE MOLLUSCA OF THE UNITED STATES. 29 



Syno^jsis of Species. 



A. Body-"whorl angulated or carinated. No. 1. 



B. Body- whorl not angulated. 



a. Aperture narrow ; a strong, tooth -like plait on the columella. No. 3. 



b. Aperture broad. 



Shell thick, coarsely striated ; with longitudinal folds. No. 3. 

 Shell thin, finely striated ; with longitudinal folds. No. 4. 

 Shell thin, finely striated ; longitudinal folds obsolete. No. 5. 



1. B. DoNOVANi, Gray. Fig. 43. 



Zool., Beechey's Voy. 128. 1839. 



Stimpson, Review of Northern Buccinums, Canad. Nat. Oct. 1865. 



Buccinum glaciale, Donovan (not Linn.), Brit. Shells, v. t. 154. 1799. 

 Buccinum tubulosum, Reeve, Icon. f. 105. 1847. 



Shell elongated, thick ; spire long and tapering ; whorls 9, con- 

 vex, with an obtuse carina at the middle of the body-whorl, some- 

 times obsolete. This carina commences at the upper angle of the 

 aperture. Longitudinal folds about thirteen, most distinct near 

 the sutures, and often obsolete on the body-whorl except at the 

 suture. Primary spiral grooves always double or triple in fresh 

 and good examples. Primary' ridges not much flattened, with 

 fine secondary grooves upon them, but the middle groove is often 

 somewhat deeper than the others. Aperture about two-fifths as 

 long as the shell, and rounded. Columellar lip incurved above, 

 and projecting below. Outer lip somewhat thickened and reflected, 

 patulous, and broadlj'- siuuated above about half-way between the 

 suture and tlie junction of the carina. Periostraca very thin and 

 not ciliated. 



Length 68, diam. 53 mill. 



Banks of Keiofoundland, northwards. 



2. B. CTLiATUM, O. Fabricius. Fig. 44. 



{Tritonium.) Fauna, Groenlandica, 401. 1780. 



Buccinum ciliatum (Fab.), Stimpson, Rev. of Buc. 1865. 



Buccinum cyaneu7n, Hancock (not Brug.), Ann. and Mag. Nat. Hist., 1 



ser. xviii. 328. 1846. 

 Buccinum Mblleri, Reeve, Icon. Buc. Errata. 1846. 

 Tritonium (Bucc.) tenebrosum, var. borealis, MiddendorflF (not Hancock), 



Mai. Ross. 162, t. 3, f. 7, 8. 1849. 



Shell rather small and solid, becoming very thick with age, 

 elongated, oval, or sub-elliptical, appressed. Sutures not im- 

 pressed ; spire short ; body-whorl elongated, and constituting 

 seven-tenths of the length of the shell. Whorls not convex, not 



