168 MANUAL OF THE MOLLUSCA. 



Animal elongated, tapering behind, entirely covered by a mantle ; tenta- 

 cles 4, the upper bearing eyes, the lower entire ; respiratory orifice on the 

 right side, near the front of the mantle. Lon. 1| inches. 



Philomycus (Raf.) Fer. = Tebennophorus, Binney, 1842, Bost. Soc. 

 Jottrn. (Helix Carolinensis, Bosc) is also a slug^with a long mantle. 



AKION, Ferussac. Land-sole. 



Type, A. empiricorum, Fer. Syn. Limacella, Brard. 



Shell oval, concave; or represented by numerous irregular calcarious gra- 

 nules. 



Animal, slug-like ; respiratory orifice on the right side, towards the front 

 of the mantle ; reproductive orifice immediately below it ; tail rounded, 

 slightly truncated, terminated by a mucus-gland. Lingual teeth, as in Umax; 

 A. empiricorum has 160 rows of 101 teeth each. The land-soles occasionally 

 , animal substances, such as dead worms, or injured individuals of their own 

 species. They lay 70-100 eggs, between May and September, are 26-40 

 days hatching, and attain their full growth in a year; they begin to oviposit 

 a month of two before that period. The eggs of A. hortensis are very phos- 

 phorescent for the first 15 days. (Bouchard.) 



Distr. 6 sp. Europe. Norway, Brit. Spain, S. Africa. 



Fossil. Newer Pliocene, Maidstone. (Morris.) 



Plectrophorus (corninus, Bosc) Fer. 3 sp. Teneriffe ; represented as 

 having a small conical shell on the tail ; probably an erroneous observation. 

 PARMACELLA, Cuvier. 



Type, P. Olivieri, Cuv. Etym. parma, a small shield. 



Syn. ? Peltella (Americana), Van Beneden. 



Shell concealed, oblong, nearly flat, apex sub-spiral. 



Animal vitrina-like, with an ample foot, pointed behind, and furnished 

 with a mucus-pore ; mantle small, shield-like, in the middle of the back, 

 partly or entirely concealing the shell. 



P. calyculata, Sby. (Cryptella, Webb f ) PL 12, fig. 27, is patelliform, with 

 an exposed papillary spire. Distr. 7 sp. S. Europe; Canary Ids. N. 

 India. 



Fig. 93. Testacella haliotoides, Fer. * 



TESTACELLA, Cuvier. 



Shell small, ear-shaped, situated on the posterior extremity of the body. 

 Animal, slug-like, elongated and tapering towards the head ; back with 



* Back view of a half-grown individual ; side-view of shell on the tail, and 

 front view of the head. From specimens communicated by Arthur Mackie, ESQ., of 

 Norwich. 



