280 SPH^BULITES, 



. cardinal teeth ;-ligament prominent, plaeed upon thick callosities ; 

 muscular impressions two, distant, rounded ; palleal impression 

 straight, with a deep sinus. East Indies. Obs. Distinguished 

 from the true Solenes by the central position of the umbones, 

 and an internal bar reaching partly across the shell, S, radiatus. 

 PI. iii. fig. 61. 



SOLETELLINA. Bl. Sangthnoiaeia radiata. S. Diphos, f. 99. 



SOEMETUS Adanson, (1757.) A very questionable genus of 

 Bullidae, founded on Adanson's doubtful figure of a lengthened, 

 slug-like animal, with a small, square, flat, unspiral shell. S. 

 livida of Sowerby, and similar species, are placed together in 

 this genus. PI. iv. fig. 99. 



SPATHA. Lea. Asub-genusoflEiniN^, consisting of I. rubens, 

 and I. nilotica, which have not distinctly crenulated margins. 

 Spatha solenoides, of Lea, is the genus Mycetopus D'Orbigny. 

 Eig. 151. 



SPH^NIA. Turt. A genus consisting of a small species resem- 

 bling Saxicava, in general appearance, but having a spoon-shaped 

 process on the hinge of one valve. S. Binghamii. PL iv. fig. 96. 



SPHJEROIDIJN'A. D'Orb. A genus of microscopic Eoraminifera. 



SPH^EULACEA. Bl. The first family of CeUulacea, con- 

 sisting of the following genera of microscopic Eoraminifera: 

 Miliola, Melonia, Saracenaria, Textularia. 



SPH^EULACEA. Lam. The fourth family of Cephalopoda, 

 Lam. described as multliocular, globular, sphserical, or oval, with 

 the whorls enveloping each other ; some of them have a parti- 

 cular internal cavity, and are composed of a series of elongated, 

 straight and contiguous chambers which altogether form a 

 covering for the internal cavity. This family contains the genera 

 Miliola, Gyrogona, and Melonia. 



SPH^EIJLITES. Lam. {Sphcera, a sphere.) Fam. Eudistes, 

 Lam. and Bl. — Descr. Orbicular, inequivalve, irregularly folia- 

 ted outside ; lower valve cup-shaped, depressed ; upper valve 

 nearly flat, like an operculum. — Obs. These fossils are not 

 regarded as shells by all conchologists. S. folaicea, PL xi, 

 fig. 193. 



