108 



S. ORBIOXYANA. Fer. and Orb. PI. 1)4, figs. 438. 439. 



Body oblong, elongate, smooth ; fins narrow, thin ; head very 

 l.irge ; jmns short, unequal, order of length 1, 4, 3. 2 ; cups sub- 

 spherical, in two rows on the base of the three upper pairs and 

 four on the ventral pair, horny rings entire ; tentacles slender, 

 club lanceolate, the cups in five lines, with live or six very large 

 ones in the middle line. Shell elongated, grooved above, granu- 

 lar: narrow and acuminated in front; narrowed, thin, rounded, 

 and with an elongated recurved beak behind. Length, 9 inches. 



Great Britain to Mediterranean. 



This and the preceding species are both eaten in the Mediter- 

 ranean countries. 



Sessile arms with very unequal sized cups, the middle ones largest. 

 Shell narrowed behind' 



S. CAPENSIS, Orb. PI. 94, figs. 440-44-2. 



Body ovate, oblong, smooth; fins dilated behind ; anus short, 

 strong, the cups spherical, peduncled ; tentacles scarcely clubbed, 

 the cups slightly oblique in three series, the middle series with 

 three much largest, and with the rings toothed on the inner 

 edge. Shell much depressed, oblong, elongate, enlarged and 

 pointed in front, tapering, thin, very obtuse and with an acute 

 projecting beak behind. Length, 4j inches. 



Cape of Good Hope ; Australia. 



S. BRACHYCHEIRA, Tapparone-Canefri. 



I have not been able to obtain a view of the journal in which 

 this species is described. 



Doubtful species. 



S. MUCRONATA, Rat'. This may equal /&. rii/icllar/d. Sicily. 

 S. ANTILLABUM, d'Orb. Jamaica. 



S. CINOULATA, Costa. Mediterranean. 



S. HEXAi'iis, G-mel. = Spectre, an orthopterous insect. (See p. 

 90. and lower figure of frontispiece. ) 



tlenus HEMISEPIUS, Stccnstni].. 



II. TYi-in 8, Steeustrup. PI. 94, figs. 444-447. 



Body semi-oval, broad, rounded behind, its ventral margins 

 with grooves containing on each side a row of aqueous pores, 



