284 INVERTEBRATA OF MASSACHUSETTS. 



Genus FUSUS, Lam. 



Shell elongated, tapering to both ends, without varices ; aperture 

 oval, terminating in a straight or slightly curved canal ; operculum 

 horny, pear-shaped, ivith the nucleus at the small end. 



FuSUS IsLANDICUS. 



Shell elongated, bluish-ichite, covered with a horn-colored epider- 

 mis ; whorls eight, marked with equidistant, revolving lines ; aper- 

 ture as long as the spire. 



State Coll., No. 17. Soc. Cab., No. 315. 



Murex corneus, Pennant ; Brit. ZooL, iv. 124, t. 7G, f. 99, Montagu ; Test. 



Brit., 258. Donovan ; Brit. Shells, ii. pi. 3S. Turton ; Conch. Diet., 89. 



DiLLWYN ; Catal, ii. 733. Wood ; Index, pi. 27, f. 107. 

 Murex Islandicus, Gmelin ; Sijst., 3555. 

 Fusus Islandicus, Martini ; Conch., iv. 159, t. 141, f. 1312, 1313. Lam.; .4re. 



sans Vert., vii. 12G. Brug. ; Ennjc. Mith., pi. 429, f. 2. Kiener; Species, 



(Fusus) pi. 7, f. 2. 

 Fusus corneus, Say ; Amer. Conch., ])\. 29. Fleming ; Brit. Anim., 348. Brown ; 



Conch, of Great Brit., ^-c, pi. 47, f. 7, 9. Encyc. Brit., vi. 448. 

 Buccinum ^racile, Da Costa ; Brit. Conch., 124, t. G, f. 5. 

 Buccinum angustius. Lister ; Conch., t. 913, f. 5. 



Shell ovate, elongated, bluish-white, ponderous, semi-transpar- 

 ent, covered with a horn-colored, somewhat velvety epidermis ; 

 whorls eight or nine, moderately convex, somewhat compressed 

 before the suture, the anterior whorl equalling two thirds the 

 length of the shell ; the whorls covered with equidistant, sub-equal, 

 raised revolving lines, quite apparent through the epidermis ; lines 

 of growth faint ; suture distinct, somewhat channelled. Aperture 

 oblong oval, half as long as the shell, polished, porcelain-white 

 within ; outer lip sharp, and minutely crenulated by the revolving 

 lines ; pillar smooth, and overspread with enamel ; canal moder- 

 ately produced, and gently curved backwards. Length 2| inches, 

 breadth IjV inch, divergence 45°. 



Var. pygmdus. Figure 199. Shell not exceeding four fifths 

 of an inch in length, whorls six, and preserving the proportions of 

 the type. 



A deep-water shell. Very large specimens, much worn, are 

 occasionally found upon Chelsea and Phillips's beaches ; along 



