SCISSURELLA. 253 



in the latter genus, which we think should at any rate be united 

 to this, the valves are somewhat differently placed, and the pedi- 

 cle is said to be smooth. Fig. 35, Scalpellum vulgare. British. 



SCAPHA. Klein. (A boat.) Navicella, Auct. 



SCAPHANDER. Montf. Bulla lignaria, Auct. Fig. 251. 



SCAPHELLA. Sw. A genus of the family " Volutinse," Sw. thus 

 described: " Shell smooth, almost polished ; outer lip thickened 

 internally ; suture enamelled ; lower plaits the smallest ; apex of 

 the spire various : 1. fusiformis, Sw. Bligh. Cat. 2. undulatus. 

 Ex. Conch, pi. 27. 3. Junonia, Ex. Conch, pi. 33. 4. stromboides. 

 5. papillosa. Sw. Sow. gen." Sw. Malac. p. 318. 



SCAPHITES. (A boat.) Fam. Ammonacea, Lam. and Bl. — 

 Descr. Convolute, chambered, closely related to the Ammonites, 

 from which it differs in the last whorl being eccentrically straight- 

 ened, and lengthened, and again incurved towards the extremity. 

 Only known in a fossil state. Fig. 481, S. sequalis. 



SCAPHULA. Sw. A genus of " Olivine," Sw. thus described: 

 " Spire very short, thick, obtuse, and not defined ; aperture very 

 wide, with only two or three oblique plaits at the base. Sw. 

 patula, Sow. Tank. Cat. 2331. (5.)" (Sw. p. 322.) 



SCARABUS. Montf. (Scarabceus, a kind of beetle.) Fam. Colima- 

 cea, Lam. Auriculacea, Fer. — Descr. Oval, somewhat compressed, 

 smooth, with slightly raised varices ; spire equal in length to the 

 aperture, pointed, consisting of numerous whorls ; aperture ovate, 

 rounded anteriorly, pointed posteriorly, modified by the last 

 whorl ; outer lip sub-reflected, with several prominent folds on 

 the iuner edge ; inner lip spread over a portion of the body 

 whorls, with several prominent folds. — Obs. The shells of this 

 genus are found like Auriculae, in marshy places. C. imbrium is 

 said to have been found on the tops of mountains, by Captain 

 Freycinet. Fig. 299*, S. imbrium. 



SCHIZODESMA. Gray. A genus composed of species of Mactra, 

 Auct. with the ligament placed in an external slit. Fig. 8, M. 

 Spengleri. 

 SCISSURELLA. D'Orbigny. (Scissus, cut.) Fam. Turbinacea, 



