330 Proceedings of the Koyal Society of Edinburgh. [Sess. 
Ep. 
Ep.Gr. 
E. 
El. 
El.S. 
G. O.S. 
H. D. 
H.D.S. 
Intr. 
Mo. 
M.Retr. 
Epidermis. 
Groove in epidermis. 
Foot. 
Flagellum. 
Supernumerary flagellum. 
Supernumerary external genital opening. 
Hermaphrodite duct. 
Hermaphrodite duct, saccular portion. 
Muscular introvert on inner sheath of penis. 
Mouth. 
Retractor muscle of foot, its two portions embracing the epi- 
dermal ends of the supernumerary penis and vas deferens. 
M.Retr.A. 
M.Retr.B. 
M.Retr. P. I 
M.Retr.P' ) 
M.Retr.P.S. i 
Retractor muscles of the anterior end. 
Retractor muscle of buccal mass. 
The two portions of the retractor muscle of the penis. 
I The two portions of the retractor muscle of the supernumerary 
M.Retr.P.S.' { penis. 
M.Retr.Tent.P.L. Retractor muscle of left posterior tentacle. 
Muc.G. 
N.B. 
N.F. 
N.Fac. 
N.G. 
N.L.E. 
N.L.I. 
N.Oc. 
N.P. 
N.P.L. 
N.P.M. 
N.P.R. 
N. P.S. 
O. T. 
Ovd. 
P. 
Pa. 
P.S. 
P.Sh.T. 
P.Sh.O. 
R.S. 
R.S.B. 
Sh. 
Mucous glands. 
Buccal nerves (cut short). 
Pedal nerves. 
Facial nerve. 
Genital nerve. 
External labial nerve (also supplies anterior tentacle). 
Internal labial nerve. 
Ocular nerve. 
Nerve to penis (penial nerve). 
Left pallial nerve. 
Median pallial nerve. 
Right pallial nerve. 
Nerve to supernumerary penis. 
Ovotestis. 
Oviduct. 
Penis. 
Papilla. 
Supernumerary penis. 
Inner sheath of penis. 
Outer sheath of penis. 
Receptaculum seminis (or spermotheca). 
Bulb of receptaculum seminis. 
Connective tissue sheath enclosing the origins of the retractor 
muscles of the penes. 
Tent. A. L. 
Tent.A.R. 
Tent.P.L. 
Tent.P.R. 
Y. 
Left anterior tentacle. 
Right anterior tentacle. 
Left posterior (or ocular) tentacle. 
Right posterior (or ocular) tentacle. 
Vagina. 
