1904.] F)IUM KAST AFHICA AND ZAXZIBAR. 391 



of small dots, and not collected into large spots. But it is possible 

 that the buccal parts of Chr. splendida, respecting which we ha.ve 

 no information, may present specific differences, and identification 

 is therefore at present not warranted. 



6. Chromodoris tryoxi (Gar.) var. (= Chr. cmreo-jnirpurea 

 CoUingwood). 



[See Bergh, " Neue Nacktschnecken, No. iv.," Jour. Mus. 

 Godefii'oy, Heft xiv. p. 14 fl['.] 



Two specimens from Ohuaka, the larger of which was about 

 three inches long in life. The body was quite smooth and very 

 soft. The mantle and edge of foot bordered with light violet ; 

 the back translucent, allowing a rough, broad, net-like grey 

 pattern to be seen beneath the surface ; the whole surface covered 

 with opaque spots of bi-ight orange-yellow. Foot bi'oad and deep, 

 with white sides beai-ing orange-yellow spots. The I'hiaiophores 

 with purple lamellae and a longitudinal white stripe behind. The 

 simply pinnate branchiae white, with a deep purple stripe down 

 each edge *. The animal was lively in its movements, and the 

 branchije continujilly waved with a quick vigoi'ous motion fi-oni 

 side to side. 



The alcoholic specimen is 35 nun. long, 13 broad, and 15 high, 

 stoutly built, with a narrow mantle-edge of only 3 mm., and the 

 tail projecting 8 mm. behind. The edges of the I'hinophore and 

 branchial pockets are slightly mised. The branchiae seem to be 

 27 in number, the median anterior plume being the largest. The 

 circuit is interrupted behind, and the ends of the row of plumes 

 turned inwards in a spii'al. 8evei'al of the plumes are bifid at 

 the tip. The anterior margin of the foot is slightly grooved but 

 not notched. The labial tentacles are very small and set some- 

 what above the mouth. The lips are large. The labial armature 

 consists of two strong, rough plates composed of a closely-com- 

 pacted mass of small thick hooks. The long white radula has 96 

 i-ows of colourless teeth, containing about 50 teeth on each side of 

 the rhachis, which exhibits folds and puckers. The teeth have 

 the charactei's usual in the genus ; the innermost bear four 

 denticles on both sides, the others five large and distinct denticles 

 below the terminal hook on the outermost side only, the highest 

 being the largest. In the outermost the denticles move upwards, 

 till they are all on the apex of the teeth. The form of the teeth 

 and labial ai-mature is accurately i-epresented in Bergh's plates. 



I think this form may be safely identified with Chr. tnjonl. It 

 difiers from Bergh's description only in the absence of ocelli with 

 black centres. It appears to be also identical with Oollingwood's 

 Chr. ait,reo-]mr2}urea, though the latter is said to have only 10 

 branchiae. The two vai-ieties may be described as Chr. tryoni 

 var. ocellata and var. aureo-puj-purea. 



* ^I quote from the notes on tbc living animal, but must admit that this expression 

 is obseuiT. (Outer and inner sides, panillel with blood-vessels shown in fiff. 3, 

 PI. XXIII.— C. C.) ' 



[la] 



