BRITISH NUDIBRANCHIATE MOLLUSCA. 43 



14. D. oblonga, A. and H. Yellowish with brown spots,, oblong, tapering behind; cloak with conical 



spiculose tubercles ; tentacles subclavate ; branchial plumes 7, rather close, surrounded by a 

 * circle of large tubercles. Length \ inch. PI. lQ,figs. 4, 5. 



15. D. bilamellata, Linn. Dull white, mottled and blotched with brown in a longitudinal direction, 



cloak covered with large, unequal, clavate tubercles; tentacles linear; branchial plumes 

 20 — 29, small, disposed in a horse-shoe form, with the ends curved inwards ; Length \ to 

 1* inch. PI. 11. 



** Body very flat, with large spicula, symmetrically arranged ; spawn of many narrow 

 coils. 

 Tongue with 2 large broad spines and 2 rudimentary ones; no central plate. 



16. D. depressa, A. and H. Pale sandy-coloured, spotted with reddish-brown; very much depressed ; 



cloak with linear pointed papillae, transparent, shewing the spicula conspicuously ; tentacles 

 linear ; branchial plumes 11, small, set in an open circle. Length -^ inch. PI. 12, 

 figs. 1 — 8. 



17. D. inconspicua, A. and H. Purplish-white, with minute brown spots, not very much depressed; 



cloak with small obtuse tubercles ; tentacles subclavate, stout ; branchial plumes 10, white, 

 set in an open circle. Length i inch. PI. 12, figs. 9 — 16. 



18. D. pusilla, A. and H. Pulvous, thickly covered with dark brown spots, ovate, depressed ; cloak 



with numerous conical tubercles ; tentacles slender, conical, white ; branchial plumes 9, 

 pure white, obtuse, set in a rather open circle. Length ^ inch. Plate 13, and Appendix 

 (6), p. iii. 



19. D. sparsa, A. and H. Yellowish-white, with distant fulvous spots or blotches, depressed ; cloak 



with distant, roundish, rather flat tubercles ; tentacles sub-conical, white blotched with 

 brown, with three or four tubercles surrounding the base of each; branchial plumes 9, 

 set in a rather open circle. Length \ inch. PL 14. 



Section 3. Branchiae united at the base, non-retractile ; body convex ; oral tentacles indis- 

 tinct, united into a veil. Acanthodoris, Gray. 

 Tongue narrow, with 2 large denticulated spines and 6 or 8 rudimentary ones : no central spine. 

 A spinous buccal collar ', with an under rudimentary jaw. 



20. D. pilosa, Mull. White, yellow, brown, or blackish, very convex, subpellucid ; cloak with slender, 



pointed papillae ; tentacles long, slightly bent, with small denticulated sheaths ; branchial 

 plumes 7 to 9, large and spreading, forming a star in the eentre. Length \ to 1\ inch. 

 PI. 15. 



21. D. subquadrata, A. and H. White, subpellucid, rather elevated; cloak small, subquadrangular, 



scarcely covering the head and foot, set with small conical papilla? ; tentacles subclavate, with 

 smooth sheaths; branchial plumes 7, large, spreading transversely; foot large and thick. 

 Length 1 inch. PI. 16, figs. 1, 2, 3 ; and Appendix (7), p. iii. 



Sub-Fam. PolycerintE. Cloak small or obsolete, generally with marginal appendages. 



Genus 2. GONIODORIS, Forbes. 



Cloak small, exposing the head, with a waved or scalloped margin, without appendages. 

 Dorsal tentacles 2, laminated, non-retractile. Oral tentacles flattened and angular. Branchial 

 plumes non-retractile. Fam. 1, PI. 17. 



