1904.] FROM EAST AFRICA AXD ZANZIBAR. 391 



of small dots, and not collected into lai'ge spots. But it is possiljle 

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

 no information, may present specific differences, and identification 

 is therefore at present not warranted. 



6. Chromodoris tryoni (Gar.) var. (= Chr. aureo-jnijrpurea 

 Oollingwood). 



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

 Godeflfroy, Heft xiv. p. 14 fi".] 



Two specimens fi-om Oliuaka, 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 sui-face ; the whole sui-face covered 

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

 with white sides bearing orange-yellow spots. The iliinophores 

 with purple lamellfe and a longitudinal white stripe behind. The 

 simply pinnate branchiae white, with a deep puiple stripe down 

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

 branchige continually waved with a quick vigorous motion from 

 side to side. 



The alcoholic specimen is 35 mm. long, 1 3 broad, and 1 5 high, 

 stoutly built, with a nari'ow mantle-edge of only 3 mm., and the 

 tail projecting 8 mm. behind. The edges of the rhinophore and 

 branchial pockets are slightly raised. The branchise seem to be 

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

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

 turned inwaixls in a spii'al. Several of the plumes are bifid at 

 the tip. The aiiteiior 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 ludula has 96 

 rows of colourless teeth, containing about 50 teeth on each side of 

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

 the characters usual in the genus ; the innermost bear four 

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

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

 being the largest. In the outei-most the denticles move upwai-ds, 

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

 and labial ai'mature is accurately represented in Beigh's plates. 



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

 diffei'S fi-om Bei-gh's description only in the absence of ocelli with 

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

 Chr. aureo-jyurpurea, though the latter is said to have only 10 

 branchife. The two varieties may be described as Chr. tryoni 

 var. ocellata and vai-. aureo-pmyurea. 



* n quote from tlic notes on the living animal, but must admit that this expression 

 is obscure. (Outer and inner sides, parallel with blood-vessels shown in fig. 3, 



PI. xxin.— c. c.)j 



