STOMATIA. 265 



Lam. Sub-ostracea, Bl. — Descr. Iuequivalve, sub-equilateral, 

 irregularly foliaceous and spinose, auriculated, denticulated at 

 the margins, attached by the lower and deeper valve ; hinge 

 rectilinear, with two prominent teeth in each valve, locking into 

 corresponding cavities in the opposite valve ; umbones separated 

 by a broad, elongated, triangular disc in the lower valve ; liga- 

 ment contained in a groove, dividing the triangular area in the 

 centre ; muscular impressions one in each valve, sub-central, 

 sub -orbicular. The Mediterranean, East and West Indies, and 

 China, produce Spondyli most abundantly. — Obs. This genus is 

 remarkable for the richness and beauty of the spines and foliations, 

 which adorn the external surface of most of the species, the 

 splendid colours by which many of them are varied, and the 

 natural groupings formed by their attachment to each other. 

 Fig. 177, and Frontispiece. 



SPORULUS. Montf. A genus of microscopic Foraminifera. 



SQUAMOSE. (Squama, a scale.) Scaly, covered with scales, as the 

 pedicle of Pollicipes Mitellus, fig. 37*. 



STENOPUS. Guild. ('Srevqc, narrow, ttqvq, foot. ) A genus nearly 

 " allied to the Linnsean Helices, from all of which it differs in 

 the curious contraction of the pedal disc, and the caudal tentacu- 

 lum furnished with a gland beneath." The shell is described as 

 heliciform, umbilicated, transparent, with the aperture transverse. 

 The two species described are Stenopus cruentatus and lividus ; 

 they are both from the Caribbsean Islands, Guild. Zool. Journ. 

 xii. p. 528, tab. 15, f. 1 to 5. 



STOMATELLA. Lam. See Stomatia. 



STOMATIA. Auct. (atofia, stoma, mouth.) Fam. Macrostomata, 

 Lam. — Descr. Sub-orbicular, oblong, auriform, variegated without, 

 iridescent within ; spire depressed ; aperture entire, very wide, 

 oblique ; peritreme uninterrupted. Obs. This genus is known 

 from Haliotis by being destitute of the series of holes ; is distin- 

 guished from Sigaretus by the substance of the shell, the latter 

 being internal, and never pearly. Our description includes 

 Stomatella, Lam. The Stomatiee are marine, and belong to 

 the East Indies and New Holland. Fig. 335, S. Phymotis. 



