96 SERAPHS. 
brium is said to have been found in the tops of mountains by 
Captain Freycinet. Fig. 299*, S. imbrium. 
SCHIZODES MA. Gray. A genus composed of species of Mac- 
tra, Auct. with the ligament placed in an external slit. Fig. 
81, Mactra Spengleri. 
SCISSUREL'LA. D’Orb. (Seissus, cut.) Fam. Turbinacea, Lam. 
Descr. Sub-globose, umbilicated, with a spiral groove termina- 
ting at the margin of the outer-lip ina slit; spire short; aper- 
ture oval, modified by the last whorl; outer-lip sharp, with a 
deep slit near the spire. Obs. This genus, consisting of small 
shells, is known from Pleurotomaria by the shortness of the 
spire; the latter genus being Trochiform. Fig. 340, S. elatior. 
SCO’LYMUS. Swainson. A genus composed of Turbinellus 
Scolymus Auct. and other similar species, described as ‘“ beset 
with blunt spines; canal short; spire pointed; inne1-lip thick- 
ened.” Ex. T. cornigerus. Fig. 382. 
SCOR’TIMUS. Montf. A genus of microscopic Foraminifera. 
SCROBI'CULATED. (Scrobiculus, a little ditch or furrow.) 
Having small ditches or furrows marked on the surface. 
SCROBICULA‘RIA. Schum. Species of Lutraria, Auct. of a 
rounded shape. Licuia, Leach. 
SCUTEL'LA. Brod. (A litle shield.) Fam. Phyllidiana, Lam. 
Descr. Shaped like Ancylus, shining within; apex posteriorly 
inclined, central, involute; muscular impressions two, oblong, 
ovate, lateral; aperture large, ovate. Obs. This genus is inter- 
mediate between Ancylus and Patella; while the aspect of the 
beak reminds us of Navicella. 
SCUTIBRANCHIA'TA. Bl. (Scutus,a shield; branchia, gills.) 
The third order of Paracephalophora Hermaphrodita, Bl. con- 
taining patelliform, but not symmetrical shells, and divided into 
the families Otidia and Calyptracea. 
SCU’TUS. Montf. (A shield.) Parmopnorus elongatus, Lam. 
SECU’RIFORM. (Securis, an axe; forma, shape.) Hatchet- 
shaped. Ex. Pedum, fig. 179. 
SEDENTA‘RIA. Lam. The third order of the class Annelides, 
Lam. Divided into the families Dorsalia, Maldania, Serpulacea, 
Amphitrites. Fig. 1 to 13. 
SEGMENTINA. Flem. Navutitus Lacustris. Montagu Test. 
Brit. 
SEMILU'NAR. Half-moon-shaped. 
SENOCLI’TA. Schum. Crveras, Leach. 
SEPTA’RIA. Lam. See TrErepo. 
SEPTA’RIA. Fer. Navicetua, Auct. 
SEPTUM. (Lat.) an enclosure; applied to the thin plate in the 
interior of Crepidula, fig. 239; also to the plates dividing the 
chambers of multilocular shells. 
SER’APHS. Montf. TsrEse.ium convolutum, Lam. 
