BRITISH NUDIBRANCHIATE MOLLUSCA. 51 



tentacles with a rose-coloured band ; anterior angles of the foot rounded. Length I inch. 

 PL 26, and Appendix (26), p. x. 

 2k E. aurantiaca, A. and H. Buff-coloured, rather robust; branchise purple-orange below, with a 

 white ring above and bright orange tips, set in 10 or 11 rows j dorsal tentacles rosy orange, 

 of moderate length ; oral tentacles shorter ; anterior angles of the foot rounded. PL 27. 



25. E. pustulata, A. and H. White, pellucid; branchise long, linear, obtuse, yellowish-orange, 



granulated with white, set in 9 or 10 rows j tentacles shortish ; anterior angles of the foot 

 rounded. Length \ inch. PL 46, figs. 4, 5. 



*** Branchiae in rather distant rows ; anterior angles of the foot rounded. 

 Lingual plate denticulated, with the central spine a little prominent. 



26. E. Couchii, Cocks. Bluish-black, with opaque white spots, anterior parts and tail white ; 



branchiae ovate-oblong, transparent white with opaque white spots, set in 4 distant rows of 3 

 papillse each ; tentacles white, linear, the dorsal pair longest. Length 1| inch. Appendix 

 (27), p. x. 



27. E. amcena, A. and H. Greenish-white, with brown markings and white spots; branchise 



yellowish-green with yellow spots, set in 8 distant rows ; tentacles with a brown band, the 

 oral about half the length of the dorsal pair. Length T 3 6 inch. PL 30, and Appendix (28), p. x. 



28. E. Northumbrica, A. and H. Greenish-white ; branchise subclavate, dark bluish-green, set in 9 



remote rows ; dorsal tentacles obtuse, annularly corrugated, oral pair rather shorter ; anterior 

 angles of the foot a little produced. Length \ inch. PI. 31, figs. 2, 3, 



29. E. arenicola, For. White, slender; branchise linear, blackish-green, with yellow tips, set in 15 



rows; tentacles long, pointed, yellowish. Length | inch. PL 31, fig. 1. 



30. E. Glottensis, A. and H. Greenish-yellow; branchise robust, blackish-green, with golden-orange 



tips, set in 8 or 9 rows ; tentacles rather long, obtuse. Length ^ inch. PL 29^ figs. 5 — 8. 



31. E. viridis, For, Greenish-white, slender; branchise linear, pointed, bright green, strongly tipped 



with white, set in 10 rather distant rows ; tentacles of equal length, longish ; anterior angles 

 of the foot slightly produced. Length ^ inch. PL 32. 



32. E. purpurascens, Flem. Pink, slender ; branchise filiform or subclavate, set in 5 rows of 3 each ; 



dorsal tentacles moderately long; oral tentacles very short. Length 1 inch. Appendix 

 (29), p. xi. 



**** Branchiae inflated ; anterior angles of the foot rounded. Spawn cup-formed. 



Lingual 'plate with large denticles and a stout central spine. Two separate plain lateral 

 spines. 



33. E. ciNGULATA, A. and H. White, spotted and blotched with olive-brown; branchise elliptic- 



oblong, white with 3 rings of olive, set in 8 or 9 distant rows ; tentacles with a fulvous 

 band. Length T 4 5 inch. PL 28. 



34. E. vittata, A. and H. Yellowish with ferruginous markings ; branchise subclavate, pale buff or 



flesh-coloured, with 3 brown bands and yellowish tips, set in 6 or 7 distant rows. Length 

 ± inch. PL 29, figs. 1—4. 



35. E. cerulea, Mont. Green, nearly linear; branchise ovate, green at the base, blue in the middle, 



and orange at the apex, set in 6 rather distant rows ; tentacles linear, green. Length ~ inch. 

 Appendix (30), p. xi. 



36. E. picta, A. and H. White, spotted with orange-brown and opaque white; branchise ovate, 



inflated, spotted with brown, set in 7 or 8 rows ; tentacles with a fulvous band. Length \ 

 inch. PL 33. 



