GASTEROPODA. BULLADZ. 39 
STIRPS II. 
Genus 16. SCAPHANDER. 
Scaphander, De Montfort. 
Testa dura, posticé valdé attenuata; spira abscondita ; aper- 
tura anticé valdé hians; umbilicus nullus. 
Ventriculus testis tribus calcareis, magnis armatus: duabus 
lateralibus majoribus, eequalibus, compresso-reniformibus, ex- 
terné concavis, interné convexis; superiore elongata, externé 
canaliculata, interne acuminata. Penis cylindricus. 
Shell hard, very much attenuated behind; the spire concealed ; 
the aperture very widely gaping; no umbilicus. 
Stomach armed with three large calcareous shells; the two 
lateral ones of which are compressed kidney-shaped, externally 
concave, convex within; the upper one elongate, externally 
channelled longitudinally, internally acumiated. 
Gioéni, a Sicilian naturalist, described the stomach of this 
animal as a peculiar genus, which he named after himself, 
Gioénia, and even detailed its economy. Bruguiére adopted 
this supposed genus, and has figured it in the Encyclopédie 
Méthodique, Vers, pl. 170, after Pholas, under the name Gioéna. 
Retzius called it Tricla. The imposition was discovered by 
Draparnaud, and was exposed by him in the Bulletin des Sciences 
for 1799, p. 113. 
1. SCAPHANDER LIGNARIUS. 
S. testa longitudinaliter crenato-striata et transversim striolata. 
Bulla lignaria, Linn. Syst. Nat. xii.i. 1184; Penn. Brit. Zool. 
iv. 116. t. 70. fig. 83 ; Humphrey, Trans. Linn. Soc. ii. 15. 
t.2; Mont. Test. Brit. 205; M. and R. Trans. Linn. Soc. 
vill. 125; Flem. Edinb. Encycl. vii. 84. 
Habitat in Anglize Occidentalis mari vulgatissimé, preesertim in 
profundo. 
Shell longitudinally striated ; the strize wrinkled, and trans- 
versely striated finely. Length of the shell two inches; of the 
animal two and a half or three inches. Colour of the shell ex- 
ternally dark, or pale reddish chestnut, more or less lineated 
