262 SPH.ERULACEA. 



known (S. Norrisii, fig. 138.) were dredged by Mr. Cuming at 

 Valparaiso. 



SOLENIMYA. Lam. (Solen and Mya.) Fam. Mactracea, Lau. 

 Pyloridea, Bl. — Descr. Equi valve, inequilateral, transversely 

 oblong, rounded at the extremities with the umbones near the pos- 

 terior side, covered with a shining brown epidermis extending 

 beyond the edges of the shell ; hinge without teeth ; ligament 

 partly internal, placed in the margin of an oblique, flattish, pos- 

 terior rib ; muscular impressions two, distant, lateral. From 

 the Mediterranean, Australian, and Atlantic Oceans. —Obs. So- 

 lenimya differs from Solenocurtus and the true Solens, in having 

 the posterior side of the shell the shortest ; in the internal liga- 

 ment ; and in being destitute of teeth. It resembles Glyci- 

 meris, but is not incrassated. Fig. 68, Solenimya radiata. 



SOLENOCURTUS. Bl. (Solen and curtus, short.) Fam. Pylo- 

 ridea, Bl. Solenacea, Lam. — Descr. Oval, elongated, equivalve, 

 sub-equilateral, with the edges nearly straight and parallel, and 

 the extremities rather truncated ; umbones not very prominent, 

 sub-central ; hinge with or without two or three rudimentary 

 cardinal teeth ; ligament prominent, placed 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. 



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

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

 this genus. 



SPATHA. Lea. A sub-genus of Iridin^, consisting of I. rubens and 

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

 solenoides, of Lea, is the genus Mycetopus D'Orbigny. Fig. 151. 



SPHiENIA. 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, Fig. 96. 



SPHiEROlDINA. D'Orb. A genus of microscopic Foraminifera. 



SPMRULACEA. Bl. The first family of Cellulacea consisting 

 of the following genera of microscopic Foraminifera : Miliola, 

 Melonia, Saracenaria, Textularia. 



