SCUTELLA. 271 



of thiB genus are found like the Auriculae, in marshy places. C. 

 imbrium is said to have been found on the tops of mountains, 

 by Captain Freycinet. S. imbrium. PI. xiv. fig. 299.* 



SCHIZO CHITON. Gray. Ch. incisus, having a notch in the 

 margin. 



SCHIZODESMA. Gray. A genus composed of species of 

 Mactea, Auct. with the ligament placed in an external slit. 

 M. Spengleri. PL iv. fig. 81. 



SCISSUEBLLA. D'Orbigny. {Seissus, cut.) Fam. Turbinacea, 

 Lam. — Bescr. Sub-globose, umbHicated, with a spiral groove 

 terminating at the margin of the outer lip in a slit ; spire short ; 

 aperture oval, modified by the last whorl ; outer lip sharp, with 

 a deep slit near the spire, decent on the coast of Britain ; 

 fossil in the Calcaire-grossier. — Obs. This genus, consisting 

 of small shells, is known from Pleurotomaria by the shortness 

 of the spire ; the latter genus being trochiform. S. elatoir. 

 PL XV. fig. 340. 



SCOLYMUS. Sw. A genus of the family " Scolyminse." Sw. 

 (Turbinella) thus described : " Sub-fusiform, armed with foliated 

 spines ; spire shorter ; pillar with distiuct plaits in the middle." 

 The species enumerated are, " cornigerus, pugilaris, Globulus, 

 Rhinoceros, ceramicus, Capitellum, umbilicaris, mitis." Sw, 

 Malac. p. 304. 



SCEOBICTJLAEIA. Schumacher. A genus belonging to the 

 TeUinidee, having no lateral teeth, but small cardinal teeth and 

 the internal cartilage placed in an oblique spathular fulcrum in 

 each valve. S. piperita, Forbes and Hanley, Brit. Mollusca, 

 pi. XV. fig. 5. 



SCONSIA. Gray, 1847. Cassidaria striata, Lamarck, &c. 



SCOETIMTJS. Montf. A genus of microscopic Poraminifera. 



SCEOBICULATED. (Serobiculus, a little ditch or furrow.) 

 Having smaU ditches or furrows marked on the surface. 



SCTJTELLA. Brod. {Scutellum, a little shield.) Fam. Phyl- 

 lidiana. Lam. — Descr. Shaped like Ancylus, pearly within; apex 

 posteriorly inclined, central, involute ; muscular impressions two, 

 oblong, ovate, lateral ; aperture large, ovate, — Obs. This genus 



