GASTEROPODA. 195 



TergipeS) Cuv. T. lacinulata. Body linear; tentacles smooth; papillae 

 in a single row on each side ; spawn kidney-shaped. 



Distr. Norway, Brit. (33 sp.) U. States, Medit. S. Atlantic, Pacific. 

 Found amongst rocks, at low- water ; they are active animals, moving their 

 tentacles continually, and extending and contracting their papillae; they 

 swim readily at the surface, inverted. They feed chiefly on sertularian 

 zoophytes, and if kept fasting will devour each other ; when irritated they 

 discharge a milky fluid from their papillse, which are very liable to fall* off. 



GLAUCUS, Forster. 



Etijm. Glaucus, a sea-deity. Syn. Laiiiogerus, Bl. Pleuropus, Eaf. 



Ex. G. Atlanticus, PL XIII. fig. 14. 



Animal elongated, slender : foot linear, channelled ; tentacles 4, conical ; 

 jaws horny ; teeth in single series, arched and pectinated ; gills slender, 

 cylindrical, supported on 3 pairs of lateral lobes ; stomach giving off large 

 cceca to the tail and side lobes ; liver contained in the branchial papillae ; 

 sexual orifice beneath first dextral gill, vent behind second gill ; spawn in a 

 close spiral coil. 



Distr. 6 sp. Atlantic, Pacific. Found on floating sea- weed; devours 

 small sea-jellies, Porpita and Velellce. (Bennet.) 



FIONA, Alder and Hancock. 



Type, F. nobilis, A. and H. Syn. Oithona, A. and H. (not Baird). 



Animal elongated ; oral and dorsal tentacles linear ; mouth armed with 

 horny jaws ; gills papillary, clothing inegularly a sub-pallial expansion on 

 the sides of the back, each with a membranous fringe running down its inner 

 side. 



Distr. Falmouth. Under stones at low-water. (Dr. Cocks.) 



EMBLETONIA, A. and H. 



Etym. Dedicated to Dr. Embleton, of Newcastle. 



Syn. Pterochilus, A. and H. ? Clcelia (formosa) Loven. 



Type, E. pulchra, PI. XIII. fig. 15. 



Animal slender ; tentacles 2, simple ; head produced into a flat lobe on 

 each side ; papillae simple, subcylindrical, in a single row down each side of 

 the back. 



Distr. Scotland (2 sp.) In the litoral and laminarian zones. 



Calliopaa (bellula) D'Orb. Brest; has 2 rows of papillee down each side 

 of the back ; cephalic lobes subulate ; vent dextral. Lon. 3 lines. 



PHOCTONOTUS, A. and H. 



Type, P. mucroniferus, PI. XIII. fig. 16. Dublin, shallow water. 

 Syn. Venilia, A. and H. Zephrina, Quatref. 



Animal oblong, depressed, pointed behind; dorsal tentacles 2, linear, 

 simple, with eyes at their base, behind ; oral tentacles short ; head covered 



