POLYCHiETA. 245 



the caruncle are more open, less closely set than in older worms. No barbed seta? 

 were found. Unlike Hesione ceylonica (q. v.), young individuals of Chloeia Jtava do 

 not possess the full number of segments characteristic of the adult. 



Eurythoe complanata (Pallas). 



Several examples of this species, whose distribution coincides with that of coral 

 reefs, were obtained from Aripu Reef and at Galle, ranging in length up to 

 200 millima and in breadth up to 17 millims. over the setae. Branchiae commence on 

 the second setigerous segment and there is one dorsal cirrus to each parapodium. 

 The caruncle is inserted into the first three setigerous segments. 



Eurythoe latissima (Schmarda, op. cit., p. 141) is a synonym of this species. 



Eurythoe longicirra (Schmarda). 



(See Schmarda, 'Neue Wirbellose Thiere,' ii., 1861, p. 142.) 

 Whether or not this is an exceptional form of E. complanata I am unable to 

 decide, but it is certain that the caruncle is inserted upon the first four setigerous 

 segments and overlaps the fifth.* The branchiae commence on the second setigerous 

 segment, and there is one dorsal cirrus to each parapodium. 



Length 40 millims., width 5 - 5 millims. One specimen, from Aripu Reef. 



Family: APHRODITID^E. 



Hermione malleata, Grube Plate I., figs. 3 and 4. 



Hermione malleata, Grube, 'Ann. Semp.,' 1878, p. 17. 



Hermione ridgewayi, HOKNELL, 'Ceylon Pearl Oyst. Rep.,' Part I., 1903, pp. 16 and 74. 



Two specimens from old Dutch Modragam Paar, 9 fathoms, Station LVI. ; one 

 specimen from Aripu Reef, 18th March, 1902. 



The malleiform processes described by Grube are clearly not definite morphological 

 structures, but merely dermal folds associated with the elytrophores and branchial 

 tubercles, the latter being transversely elongate. 



This species is the Oriental form representing the Mediterranean species Hermione 

 hystrix. I have satisfied myself on this point by actual comparison of the material 

 from Ceylon with specimens of II. hystrix procured from the Stazione Zoologica at 

 Naples for the special purpose of this investigation. The only serious divergence in 

 Grube's description relates to the paljas, which he describes as being smooth. His 

 sjiecimen only measured 16 millims. in length, and the palps, when examined under 

 low magnification by transmitted light, appear smooth, though in reality they are 

 beset with minute papilla?. The Neapolitan specimens of H. hystrix are larger and 

 darker than the Ceylon worms ; the elytra thicker and more opaque. 



A complete Ceylon worm measures 30 millims. long by a width of 12 millims. over 



* For further remarks on this point see Ehlers, ' Florida- Anneliden,' 1887, p. 30. 



