36 GASTEROPODA. BULLADZ. 
Branchie dextre, sub pallii dilatatione tecte. Pallium 
super branchias reflexo-dilatatum. Tentacula nulla. Labium 
superius supra dorsum productum, lateraliter dilatatum, discum 
efformans. Pes latissimus, cum labio inferiore penitus coales- 
cens, lateraliter valdé dilatatus latera amplectens, posticé ultra 
corporis medium productus. Testa involuta, spira seepius abs- 
condita. Os verticale. 
Stirpium et Generum Synopsis. 
Stirps 1. Testa sub palli reflectione recondita. 
Spira abscondita, apertura tota hians, um- 
brbicus mulling. i). otc thass,d BS oe ye ok, ey 
Stirps 2. Testa nuda, externa. 
Testa dura, posticé valdé attenuata ; spira 
abscondita; apertura antice valde hians; 
Habs MS oe) a gic oe 16. SCAPHANDER. 
Testa duriuscula, ovato-ventricosa ; spira 
abscondita; apertura anticé hians ; um- 
bileus nulllus.. 5.0.06 dy 2 oe ele 2 ey 17. 
Testa tenuis, flexilis, cylindraceo-ventri- 
cosa ; spira canaliculata, plana ; aper- 
tura anticé hians; umbilicus nullus.. 18. Eucampr. 
Testa solida; apertura anticé paululum 
hians ; spira immersa ; umbilicus per- 
HOTA: Joie asi- aii, yee «neat as Ses Cem 
All the Bulladee are marine. Their branchie are foliaceous ; 
the leat-like processes are again divided into folia. Mouth 
vertical. No tentacula. Upper lip produced over the back, 
dilated laterally, forming a disc. Mantle dilated and reflexed 
over the branchize. Foot very broad, united thoroughly with 
the lower lip, very much dilated laterally, embracing the sides 
of the body, and produced posteriorly beyond the middle. 
Shell involute, its spire generally concealed. 
Their mouth is furnished with two horny lamelle like the 
Aplysiade. The anterior part of the body, which is covered 
by the labial dise, contains the brain, the salival glands, and 
