42 A MONOGRAPH OF THE 



b. Lingual spines long, slender, denticulated. 



3. D. Zetlandica, A. and H. White ; cloak with large, soft, conical, pointed, unequal tubercles ; 



dorsal tentacles linear; branchial plumes 6, bipinnate. Length A inch. Appendix (1), p. i. 



** Oral tentacles linear. 



Lingual spines of two kinds, various : no central spine. Occasionally with a spinous 

 buccal collar. 



4. D. millegrana, A. and H. Yellow or orange (?), cloak covered with minute, granular tubercles; 



branchial plumes 6, bipinnate. Length 1± inch. Appendix (2), p. i. 



5. D. Johnstoni, A. and H. Yellowish-white or yellow, with a few minute brown spots ; cloak 



covered with minute, close-set, pilose tubercles ; dorsal tentacles clavate ; branchial plumes 

 15, tripinnate, forming a cup. Length li to 2 inches. PL 5. 



6. D. planata, A and H. Very flat, variegated brown and yellowish, with very unequal, soft, warty 



tubercles; dorsal tentacles subclavate; branchial plumes 7, small, tripinnate, mottled. 

 Length 1 inch. PL 8. 



7. D. coccinea, For. Scarlet, with a few minute black spots ; cloak minutely tuberculated ; dorsal tenta- 



cles broadly clavate ; branchial plumes 10, small, simply pinnate, erect. Length \ inch. PL 7. 



*** Oral tentacles flattened. 



Lingual spines denticulated ; a small central spine. A spinous buccal collar. 



8. D. repanda, A. and H. Waxy white ; cloak with small, rather distant, soft tubercles ; a row of 



sulphur-yellow or opaque white spots down each side ; dorsal tentacles subclavate ; branchial 

 plumes 5, tripinnate, small. Length 1 inch. PL 6, and Appendix (3), p. ii. 



Section 2. Branchiae simply pinnate, set separately in an open circle, non-retractile ; 

 without oral tentacles, their place being supplied by a veil. Lamellidoris. 

 Tongue narrow ; lingual spines few. 



* Body not greatly depressed ; cloak with moderate-sized spicula ; spawn of few coils, 

 cupformed. 

 Tongue with 2 large spines and 2 or more rudimentary ones :* usually a quadrangular central 

 plate. 



9. D. aspera, A. and H. White ; cloak with stout, flatfish, clavate tubercles ; tentacles sub-conical ; 



branchial plumes 11, small, erect. Length T 3 5 inch. PL 9, figs. 1 — 9. 



10. D. proxima, A. and H. Orange yellow; cloak with stout elliptical tubercles; tentacles sub- 



clavate; branchial plumes 11. Length \ inch. PL 9, figs. 10 — 16. 



11. D. muricata, Mull. Yellowish-white; roundish, cloak with large, close-set, rounded, clavate 



tubercles; branchial plumes 8—10 (Lov). Length & inch. Appendix (4), p. ii. 



12. D. ttlidiana, Thomp. Pale-yellow, oblong ; cloak with rather large, unequal, depressed tubercles ; 



tentacles slender, linear ; branchial plumes 11, beautifully white, set in a semicircle. Length 

 i inch. Appendix, (5) p. ii. 



13. D. diaphana, A. and H. Very transparent, white; cloak with equal, clavate, rather distant 



tubercles; tentacles nearly linear, stout; branchial plumes 11, yellowish, set in an open, 

 incomplete circle ; liver appearing through the skin very large and black. Length \ inch. 

 PL 10. 



* To avoid repetition it may be stated here that the number of spines given in the descriptions 

 of the tongues has reference to a single transverse row only. The rows of spines are numerous. 



