SOLARIUM. 277 



central disc, but interrupted in front, wliere the head of the 

 animal reposes, and at the side by a siphon, or canal passing 

 from the apex to the margin. — Obs. This siphon, which is in 

 some species very distinct, serves to distinguish this genus from 

 PateUa. S, Sipho. PL xii. fig. 231*. 



SIPHONOBEANCHIATA. Bl. (^Siphon, and Branchice, gills.) 

 The first order of Paracephalophora Dioica, Bl. divided into the 

 families Siphonostomata, Entomostomata, and Angiostomata. 



SIPHONOSTOMA. Guild. A sub-genus of Pupa, consisting 

 of several elongated species, which have the aperture detached 

 from the whorls ; such as P. costata, and fasciata. 



SIPHONOSTOMATA. Bl, (Si(/)ov, siphon; arofia, stoma, 

 mouth.) The first family of Siphonobranchiata, Bl., the shells 

 of which are extremely variable in form, but always have a canal 

 or notch at the anterior extremity of the aperture. This family 

 partly answers to the Canalifera of Lamarck and the genus 

 Murex in the system of Linnaeus. It contains the genera 

 Pleurotoma, Rostellaria, Fusus, Pyrula, Fasciolaria, Turbinella, 

 ColumbeUa, Triton, Murex, Eanella, and Struthiolaria. 



SIPHUNCLE. (Siphunculus.) A smaU siphon. 



SISTEIJM. Moutf. (1810,) claimed a prior name for Eicinula, 

 Lamarck. Pig. 413. 



SKENEA. Flem. Typified by S. planorbis. A marine shell of 

 depressed form. PI. 74, fig. 25. 



SMILIUM. Leach. Fam. Pedunculated Cirripedes. — Bescr. 

 Thirteen pieces, ten of which are in pairs, lateral, subtriangular ; 

 one posterior dorsal, linear ; all smooth ; peduncle hairy. — Ohs. 

 This genus is now included in Scalpellum. PI. ii. fig. 36, 

 S. Peronii. 



SNAIL. The common garden Snail, so destructive to our vege- 

 tables, belongs to the genus Helix. The water snail, found in 

 ponds, is Planorbis. 



SOL. Humph. A genus consisting of several species of the 

 genus Trochus, and corresponding with the sub-genus Tubi- 

 canthus, Sw. Malac. Fig. 349. 



SOLAEIUM. Lamarck. Aechitectoma, Bolter. {A terrace or 



