128 DR. CUTHBERT COLLINGWOOD ON SOME NEW SPECIES OF 



Colour and general appearance. — Mantle deep blue, with a narrow edging of bright 

 yellow, and an irregular yellow stripe on either side of the median line, or broken up into 

 yellow spots. Large black roundish spots are scattered irregularly over the surface. The 

 foot is of a lighter blue colour, spotted irregularly with yellow and black spots ; the black 

 ones roundish, the yellow ones forming an irregular line. Branchiae and tentacles rich 

 vermilion, the latter arising from tricoloured bases. 



Spawn, a spiral ribbon of a pale straw-colour, deposited under observation. 



Two specimens of this splendid species I obtained in a basaltic rock-pool under a large 

 stone, at Makung, Pescadores Islands, May 12th, about midway between high- and 

 low-water marks. In August of the same year I obtained one specimen of the same 

 species from a reef on the shore of Labuan Island. Prom the beautiful combination 

 of the three primary colours presented in this species, I have given it the name of the 

 rainbow-goddess Iris. 



Gould's Doris smaragdma* bears a distant resemblance, but is a smaller animal, more 

 greenish, with an indigo-blue margin and mantle, tentacles and branchiae yellow. 



Under Ghromodoris rimcinataf and C. Semper 1 1 Dr. Rudolph Bergh has described 

 two new species from the Philippines ; but though in some points as to coloration and 

 markings there is an approach to C. iris, the distinction, in absence of dorsal and mar- 

 ginal yellow stripes, with greyish tentacles and branchiae and other particulars besides 

 geographical distribution, warrants specific separation. 



Chromodobis Btjllockii, Coll., n. sp. (Plate IX. figs. 15-17.) 



Length 2f inches. Body rather compressed, translucent. Mantle broad and square 

 in front, narrowing behind, and having the sides and posterior portion of the foot 

 uncovered. Dorsal tentacles ^o mcu l° n g> slender, consisting of a cylindrical pedicle, 

 smooth, and supporting a club-shaped, spirally laminated head. JBranchice consisting of 

 seven simple leaflets arranged in three sets, and arising from a thick retractile peduncle 

 situated in a cylindrical sheath of the mantle, a little more than halfway from the anterior 

 edge of the mantle to the posterior point of the foot. This peduncle gives off one leaflet 

 in front, and two lateral branches, each of which gives rise to three leaflets. The leaflets 

 are angular posteriorly, and edged with delicate papillae upon the anterior aspect. 

 Head concealed by the mantle, and bearing two small oral tentacles. Foot long and 

 fleshy, extending nearly three fourths of an inch beyond the posterior edge of the 

 mantle. 



Colour and general appearance. — Body semitransparent. Head of a deep amethystine 

 tint, shading behind the dorsal tentacles through paler amethyst to reddish upon the 

 back ; an opaque white edging all round the mantle. Peduncles of the tentacles and 

 branchiae deep amethyst ; laminated portion of the tentacles and leaflets of the branchiae 

 deep orange-yellow. Foot pale amethyst, becoming deeper at the posterior portion, where 

 it is as deep as at the anterior part of the mantle. 



* U. S. Exploring Expedition, vol. xii. p. 290 ; Atlas, pi. xxii. figs. 390 a-c. 



t Semper's ' Reisen ini Arehipel der Philippine^' 1S77, Band ii. Heft 11, p. 479, and Hct't 10, pi. 53. figs. 5-12. 



J Bergh, op. tit. supra, Exit 11, p. 482. pi. 55. figs. 2-7. 



