DORIDIDiE. 



D. pilosa. Lateral spines 4 on each side ; the 3 outer ones small and rudimentary ; the inner one 

 large, broad and convex at the base, with a lateral thickened arch ; the apex much produced, 

 strongly curved, with a denticulated ridge on each side. No central plate. 27 rows. 

 4-0-4. Fam. 1, PL 1, figs. 3, 4, 5. 



D. subquadrata. Lateral plates 5 on each side ; the 4 outer ones rudimentary ; the inner one large, 

 very broad at the base, swelling anteriorly, with a lateral thickened arch ; the apex elongated 

 and curved, with a denticulated ridge on each side. No central plate. 20 rows ; pale 

 yellowish. 5-0-5. Fig. 14. 



S ub - F am . Poly cerince . 



Goniodoris nodosa. Lateral spines 1 and a small external plate on each side ; spine large, sub- 

 triangular, pointed, the upper part strongly denticulated at the sides. No central plate. 



22 rows ; dark amber-coloured. 1+1 ' • 1 +1. Fig. 15. 

 G. castanea. Like the last, but with the large spines smooth at the margin. 1 +1 • • 1 + 1. 

 Triopa claviger. Lateral spines 2 and 10 plates on each side; the outer spine stout, hooked, and bifid, 



with the margin ridged ; the inner very slender and curved ; the plates quadrilateral. No 



central plate. 45 rows. 10 + 2-0-2 + 10. Fig. 16. 

 JEgirus punctilucens. Lateral spines 19 or 20 on each side, uniform, rather stout, smooth, hooked. 



No central plate. 19 rows; amber-coloured. Tongue broad. 20-0-20. Fig. 17. 

 Thecacera pennigera. Lateral spines 2 and 3 plates on each side ; spines rather slender, bicuspid, with 



the margin ridged ; the inner spine smallest ; plates quadrate-ovate, the outer one minute. 



No central plate. 10 rows; pale straw-coloured. Tongue rather small. 3 + 2 -0*2 + 3. 



Fam. 1, PI. 21 a, fig. 7. 

 T. virescens. Lateral spines 2 and 5 plates on each side ; spines stout, broad, bicuspid, ridged at the 



margin, the inner spine smallest; plates subquadrate. No central plate. 18 or 19 rows, 



alternate ; pale yellow. 5 + 2 • • 2 + 5. Fig. 18. 

 T. capitata. Lateral spines 2 and 4 plates on each side ; spines elongated, more slender than in 



T. virescens, bicuspid, the anterior point longest, margin ridged; plates oblong-ovate, 



pointed below, with a ridge in the centre. No central plate. 10 rows, alternate ; dark 



amber-coloured. 4 + 2-0-2 + 4. Fig. 19. 

 Polycera quadrilineata. Lateral spines 2 and 4 plates on each side; spines bicuspid, the anterior 



point produced into a strong, broad hook, with the margin ridged ; inner plate smaller and 



less hooked; plates subovate, slightly angled, and elevated in the centre. No central 



plate. 15 rows, alternate ; dark amber-coloured. 4 + 2-0-2 + 4. Fig. 20. 

 P. ocellata. Lateral spines 2 and 5 plates on each side ; spines bicuspid, stout, the points nearly equal 



in length ; outer spine ridged at the sides, inner one very small ; plates subquadrate-ovate. 



No central plate. 16 rows, alternate ; rusty red-coloured. 5 +2 • • 2 + 5. Fig. 21. 

 P. Lessonii. Like the last, but with 6 plates on each side and the spines rather more elongated. 



13 rows ; amber-coloured. 6 + 2*0-2 + 6. 

 Ancula cristata. Lateral spines 2 on each side ; the outer small, smooth ; the inner large, broad, 



ovate, pointed, denticulated on the inner margin. No central plate. 25 to 27 rows ; dark 



brown. 2*0-2. Fig. 22. 

 Idalia elegans. Lateral spines 2 on each side ; the inner one large, falcate, broad at the base, 



tapering to a point above, the front margin thickened by a smooth rib ; outer spine small, 



triangular. No central plate. 28 rows ; pale yellow. 2*0-2. 



