SCALPELLITM. 269 



SCABEOUS. Eough. 



SCALA. Klein. Scalaeia, Auct. 



SCALAEIA. Lamarck, 1801. Fam. Scalariana, Lam. Cricos- 

 tomata, Bl, — Descr. Turrited, oval or oblong ; spire long, com- 

 posed of rounded, sometimes separate whorls, surrounded by 

 regular concentric ribs ; aperture oval, peristome reflected, 

 continuous, entire — 06s. The typical species of this genus, 

 commonly called the Wentletrap, (S. pretiosa) is celebrated for 

 the beautiful appearance caused by the numerous ribs encircling 

 the whorls, and formerly produced an immense price in the 

 market. It is brought from China, There are many smaller 

 species, some of which are equally elegant. Fig. 351, S. Pallasii, 

 Kiener. The Monograph in Sowerby's Thesaurus contains 93 

 species. 



SCAL AETNA. Lam. A family belonging to the first section of 

 the order Trachelipoda, Lam. The shells belonging to it are 



- described as having the inner and outer lips continuous, without 

 a canal, emargination, or other division. In this respect the 

 family is stated to differ from the Turbinacea, and is therefore 



■, separated. The genera may be distinguished as follows : — 



1. Yeemetus. Irregularly twisted, like Serpula. Kg. 345. 



2. EiJLiMA, Pyramidal ; apex contorted ; including Bonellia. 



rig. 847, 348. 



3. EissOA. Pyramidal, straight, consisting of a few whorls. 



Pig. 346. 



4. ScALABiA. "With external varices. Pig. 351. 



5. CiRETis. Trochiform. Pig, 349. 



6. Enomphalus. Orbicular. Pig. 350. 



7. Delphinula, Pew whorls, rapidly increasing. Pig. 352, 

 •SCALLOP. The common name for shells of the genus Pecten, 



- the larger species of which were worn by pilgrims to the Holy 

 Land in the time of the Crusades. 



SCALPELLUM. Leach. 1817. (A Httle knife or lancet.) 

 Order, Pedunculated Cirripedes, Lam. Bescr. Pkt, quadrated, 

 acuminated, composed of thirteen valves, one dorsal, arcuated ; 



^ one pair apicial, acuminated : one pair ventral ; two pair lateral, 



