454 T. J. EVANS 



Bibliography. 



1. Alder and Hancock. — 'A monograph of the British Nudibranchiate 



Mollusca ', parts i-vii, Ray Society, 1845-55. 



2. J)reyer. — " The reproductive systems of the Nudibranchs ", ' South 



African Journal of Science ', 1912. 



3. Eliot. — Alder and Hancock's Monograph, supplementary part viii, 



1910. 

 4. — — "Notes on some British Nudibranchs", ' Journ. Mar. Biol. 

 Assoc.', vol. vii, 1906. 



5. Friele and Hansen. — " Bidrag til Kundsk. om de norsk. Nud.", ' Chris- 



tiania Vid. Selsk. J'orh.', 1875. 



6. Heeht. — " Contrib. a Tetude des Nudibranches ", ' Mem. Soc. Zool. de 



France', 1895(6). 



7. Herdman. — ' ' On the structure and function of the cerata in some Nud. 



IMolI.", ' Quart. Journ. Micr. Sci.', vol. xxxi, 1890. 



8. Orton. — " A preliminary account of a contribution to the evaluation of 



the sea ", ' Journ. Mar. Biol. Assoc.', vol. x(2), 1914. 



9. Trinchese. — " Ricerche anatomiche sulla Forestia miiabilis ', ' Mem. 



Accad. Bologna ', ser. iv, vol. x, 1889. 



EXPLANATION OF PLATE 11. 



Fig. 1. — Dorsal view of the mature animal, a.m./., anterior margin of the 

 foot ; c.t., cephalic tentacle ; E., eye ; g., gonad seen through the integu- 

 ment ; pc, pericardium ; pe., extruded penis ; rk., rhinophore ; r.o., renal 

 opening. 



Fig. 2. — Buccal mass laid open dorsally by turning back the flap /. 

 j., muscular pads thinly chitinizcd, called jaws when the chitin is locally 

 thickened ; m., mouth ; o., gullet ; rad., odontophore with radula. 



Fig. 3. — Side view of the radula. b.r., basal dentigerous rod. 



Fig. 4. — Anterior end of the radula. highly magnified. 1.2.3.4.5, the 

 primary teeth. Note the reduction in size from 1 to 4, and the loss of 

 shape at 5. 



Fig. 5. — Part of a section of a ceras. a.g., epidermal gland-cell with 

 contents taldng acid dyes ; b.g., ditto taking basic dyes ; b.s., blood-space ; 

 C.C., ciliated cell of the epidermis ; c.s., comiective-tissue cell ; c.t., dense 

 dermal connective tissue ; d.c, digestive cell ; /., food with vacuoles ; 

 m.f., muscle- fibres. 



Fig. 6. — A connective- tissue cell, special cell of Hecht, durmg solution 

 of its contents, c, clear envelope free from granular material ; n.b., 

 nucleolar body. 



Fig. 7. — Central nervous system, cp.g., cerebro-pleural ganglion ; 



1 



