30 GASTEROPODA. APLYSIADZ. 
This species has hitherto been found in the Kingsbridge 
Estuary, near the Saltstone, and has been recently observed 
likewise in Torbay by Mrs. Griffiths, who, with her usual libe- 
rality, communicated to me a fine specimen of its shell. 
FAMILY II. APLYSIAD. 
Branchie dextro-dorsales, operculo testigero (ad sinistram 
quasi cardine instructo) tectee. Pallium utrinque supra oper- 
culum dilatatum, quod ad occiput aut ad caput dextrum est 
productum, syphonem respiratorium, inchoatum efformans. 
Tentacula 4 involuta: 2 labialia; 2 antico-dorsalia. Os aper- 
tura verticali. Pes corporis longitudinem eequans aut paulu- 
lum superans, non dilatatus. Testa cornea, interna, posticé 
ad dextram emarginata. 
Synopsis Generum. 
Sypho respiratorius usque ad dextrum caput 
productus. Testa subpostica .......... 12. APLysIa. 
Sypho respiratorius ad capitis basin, posticé 
ductus. Testa subantica.. -... . oeaseserte 13. Esmta. 
Branchiz situated on the right side of the back, covered by 
an operculum or lid, which is jomed to the left side as with a 
hinge. Mantle dilated above the operculum on each side, and 
produced to the hinder base or right side of the head, forming 
a rudimentary syphon for respiration. Tentacula four mvo- 
luted: two labial; two anterior-dorsal. Opening of the mouth 
vertical. Foot as long or a little longer than the body, not 
dilated. Shell horny, internal, enveloped by the skin of the 
animal, and in no degree adhering to it. 
Genus 12. APLysIA. 
Lepus marinus, Plinii, Rondeleti. 
Laplysia, Linné, Bruguiere, Lamarck. 
Aplysia, Gmelin, Duméril, Cuvier. 
Sypho respiratoriuvs usque ad caput dextrum productus, 
Testa subpostica. Pes posticé subproductus, 
