STOMAX. 283 



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 folia- 

 tions, 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. 

 Forty species are enumerated in the Thesaurus Conchylium, 

 PI. 8 by the Aiithor, PI. 83 to 89 ; our PI. x, fig. 177, and 

 frontispiece. 



SPOEiULUS. Montf. A genus of microscopic Foraminifera. 



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

 the pedicle of Pollicipes Mitellus, fig. 37*. 



STENOPUS. Guild. (Sreyoc, narrow ; ttovq, foot.) A genus 

 nearly " allied to the Linngen HeHces, from all of which it diifers 

 in the curious contraction of the pedal disc, and the caudal ten- 

 taculum furnished with a gland beneath.' ' The shell is described 

 as heliciform, umbilicated, transparent, with the aperture trans- 

 verse. The two species described are Stenopus cruentatus and 

 lividua ; they are both from the Caribbaean Islands, Quild. Zool. 

 Journ. xii. p. 528, tab. 15, f. 1 to 5. St. cruentata, f. 515, 516. 

 Including Nanina, Gray, Helia, Citrina, f. 280. 



STOASTOMA. C. B. Adams, A genus of minute operculated 

 land shells, of a globose form, and semicircular aperture, with a 

 nucleus or concentric operculum. The outer lip is not reflected, 

 and it is produced beyond the columella, from which it is sepa- 

 rated by a little groove.. In the absence of more accurate 

 knowledge of the animal, I should hesitate to regard this as 

 more than an interesting group of Heliciuse, not more distinct 

 from other groups of the same genus than they are from each 

 other. Mr. Cuming's collection contains 12 species. En. S. 

 pisum (Jamaica.) PI. xxviii. fig. 582. 



STOMATELLA, Lam. See Stomatta. Gena, Gray. Pl.xv. 

 fig. 386. 



STOMATIA. See Stomax. 



STOMAX. Montf. 1810. Stomatia, Lamarck, 1801. Fum. 

 Mocrostomata, Lam. — Descr. Sub -orbicular, oblong, aiu-iform, 



