$92 SIR C. ELIOT ON NUDIBRANCHS [Mar. 1, 



7, Ohromodoeis vioina. 



Ghi'omodoris vicina Eliot, Abstr. P, Z. S. 1904, Ko. 4, p. 15, 

 March 8. 



Twelve specimens from Chuaka. 



The following notes were made on the living animal : — • 



" Mantle and foot bordered with light violet, the latter border 

 a row of dots. Middle of back drab-brown with bright violet 

 spots, the larger ones with a w^hite centre. Near the edge of 

 the mantle a number of yellow spots with white borders, which 

 are often confluent. The foot deep and narrow, white with 

 some yellow spots near the lower edge. The rhinophores dark 

 brown with white tips. Each of the branchife bore two black 

 bands." 



The alcoholic specimens are of a diiU reddish brown and present 

 two very different forms : one long and narrow, measuring 37 mm. 

 in length and 9 mm. in breadth, and the other oval, being 27 mm. 

 long and 20 broad. Both are about 20 mm. high. The margin 

 of the mantle is about 6 mm. wide, and forms a sort of hood over 

 the head. The branchial opening is vei-y small. Both it and the 

 rhinophore openings are slightly raised. The branchiae are 16 in 

 number, the circuit is open behind, and the row of phxmes turns 

 inwards in a small spiral. The foot is long and narrow. In the long 

 form of the animal it projects about 5 mm. beyond the mantle ; 

 in the broad form it is covered by it. The anterior margin is 

 rounded and grooved, but not notched. On each side of the mouth 

 is a small conical tentacle. 



The labial armature consists of tw^o yellowish plates composed of 

 rather long rods, bifid at the tip and generally bent into the form 

 of hooks, but sometimes straight. These are mixch like the same 

 organs in Chr. striatella {vide Bergh, ' Challenger ' Reports). The 

 formula of the radula is about 50 X 45.0.45. The rhachis is bare 

 but exhibits in places a slight wavy fold. The innermost teeth 

 bear three denticles on each side of the central cusp. The next 

 two or three are of mvxch the same shape, but denticulate only on 

 the outer side. The majority are tall and straight, bearing five 

 large and distinct denticles under the terminal hook, and some- 

 times two or three small irregular denticles in addition. The five 

 or six outermost are irregular in shape, and bear from three to 

 six irregular denticulations mostly on the apex. 



This species is closely allied to (7/w. tryo7ii, and will not im- 

 probably prove to be a mere variety of it. All the present 

 specimens, however, have a somewhat different coloration, fewer 

 branchiae, and more numerous denticles on the teeth. 



8. Chromodoris elizabethinaB., var. AFRicANA. (Plate XXIV. 

 fig. 4.) 



Two specimens from the East Coast of Zanzibar. The notes on 

 the living animal describe the dorsal surface as black and white, 

 black preponderating. The mantle had a double boi'der, yellow 



