268 SCABEICULA. 



SANDALIISTA. Schum. Ceepidulina, Lam. A genus of micro- 

 scopic Eoraminifera. 



SANG-TJINOLAEIA. Lamarck, 1801. {Sanguis, blood.) Fam. 

 ISTymphacea, Lam. Pyloridea, Bl. — Bescr. Equivalve, inequi- 

 lateral, transverse, sub-ovate, rounded anteriory, sub-rostrate 

 posteriorly, compressed, tbin, covered witb a sbining epi- 

 dermis, gaping at tbe sides ; binge vs^itb two cardinal teetb in 

 eacb valve, and an external ligament supported upon a pro- 

 minent fulcrum ; muscular impressions two in eacb valve, 

 lateral, irregular, palleal impressions witb a large sinus. — Obs. 

 Tbis description is made to exclude some of Lamarck's species 

 of Sanguinolaria, sucb as S. occidens, S. rugosa, wbicb are 

 Psammobise; and to include otbers wbicb be bas left out. 



. Tbe SanguinolariaD are sub-rostrated posteriorly, wbile tbe 

 Psammobise are sub-quadrate, and bave a posterior angle. S. 

 rosea. Sandy sbores of tropical climates. PL iv. fig. 98. 



.SAEACENAB-IA. Defr. A genus of microscopic Poraminifera. 



SAYIGrNIUM. Leacb. A genus of Sessile Cirripedes, described 

 as composed of four valves soldered togetber, and a convex 

 bivalve operculum ; tbe ventral and posterior valve on eacb side 

 being soldered togetber, in otber respects resembling Ptbgoma. 

 PI. i. fig. 30. 



SAXICAYA. El. de Belvue. Journ de. Pb. an. 10. (Saxum, a 

 stone ; cava, a boUow.) Fam. Litbopbagid83, Lam. Pyloridea, 

 Bl. — Bescr . Transverse, irregular, generally oblong, inequilateral, 

 sub-equivalve, gaping anteriorly ; ligament external ; muscular 

 impressions two, lateral ; paUeal impression interrupted, not 

 sinuated ; binge, wben young witb sometimes two or tbree 



. minute, obtuse, generally indistinct, cardinal teetb ; wbicb 

 become obsolete wben full grown — Obs. Several genera bave 

 been founded only upon tbe difference between tbe young and 

 old sbell of tbe same species of tbis genus. Tbe Saxicavse are 

 found in the little boUows of rocks ; in cavities on tbe backs of 

 oysters, of roots of seaweeds, &c. in nortbern and temperate 

 climates. S. rugosa, PL iv. fig. 94. 



SCABEICULA. Sw. A sub-genus of Mitrse, consisting of species 

 wbicb bave a rougbened external surface, &c. Sw, Malac. p. 319. 



