ON MOLLTJSCA OF THE WEST COAST OF NORTH AMERICA. 



bbb 



324. Turritella Cooperi, n. s. 



325. Turritella Jewettii, n. s. 



326. Mesalia lacteola, ? n. s. 



Family Ccecidce. 

 822. CfPcum crebricinctum, n. s. Large, with aspect of Elephantulum, but very fine 



close annular sculpture ; plug subungulate. 8-20 fm. Cp. 

 323. Ccecum Cooperi, n. s. Small, with 30-40 sharp narrow ring-;. 



Family TurriteUidce. 



Extremely slender, with many narrow whirls, c. Oi', 



Like sanguinea, with very faint sculpture. 



__ May be a local var. of the circumpolar lactea, with 



altered sculpture : distinct, teste Cumino;. 



326 b. Mesalia ?var. subplanata. Sculpture fainter : whirls flattened. 



327. Mesalia tenuisculpta, n. s. Very small, slender, whirls rounded, lip waved. 



Shoal-water, Cp. 



Family Cerithiadce. 



328. Cerithidea sacrata, Gld. E.E.= Ca/z/brmca, Nu.it. -\-pullata, Gld. Variable in 



shape and sculpture : passes into Mazatlanica, Maz. Cat. no. 395. 



329. * Bittium filosum, Gld. E.E.=jKsc/7cAfoY, Midd. Strong, broad, grooved. 

 S29&. Bittium ?var. esuriens. Like starved filosum, very narrow, adult scarcely 



sculptured. 



330. Bittium attenuatum, n. s. Like plicatum, A. Ad., or drawn-out esuriens, with 



threads instead of grooves. 



331. ^Bittium quadrifilatum, n. s. Broad : 4 threads, equal from beginning, coiling 



over strong radiating ribs. 



332. * Bittium asperum, n. s. Same aspect : upper whirls with 2 strong and 2 faint 



keels over less prominent ribs. Bch. 40 fm. Cp. 



333. * Bittium armillatum, n. s. Same aspect : 3 nearly equal rows of knobs. 



334. Bittium fastigiatum, n. s. Small, slender : apex normal : sutures indented, 



anterior rib strong. 



Family Litorinidce. 



335. Litorina planaxis, Nutt. Phil. =?/, Gld. E.E. Outside plain; columella 



scooped. 



336. Litorina Sitchana, Phi\.=sulcata, G\d..=rudis, Coop. Rounded, flat, with spiral 



ribs. Var. modesta, Phil, (pars) has sculpture mint : subtenebrosa, Midd., is 

 perhaps a degraded var. Rocks between tides, Lord', 8-10 fm. Lyall [?]. 



* These species have so peculiar a nucleus that they can scarcely rank near Ceri- 

 iluwin or Jtiissoa : perhaps they are related to Aiaba. The nucleus of esuriens and 

 ttttemtatum has not been seen. 



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