246 CEYLON PEARL OYSTER REPORT. 



the neuropodia ; fifteen pairs of elytra covering the back ; length of dorsal glochideal 

 spines up to 10 millims. (Plate I., fig. 3). Eye-peduncles rounded. Cirrophores and 

 neuropodia thickly covered with minute rounded papillae ; neuropodia 3 millims. long. 

 Ventral surface beset with similar papillae. Tentaculum impar, tentacular cirri, 

 dorsal cirri and first ventral cirrus with distal clavate tip articulated to the main 

 shaft, which is expanded at this point. Palps 13 millims long, beset with six 

 longitudinal rows of minute spiniform papilla?. The elytral segments carry on each 

 side a nabellum of curved smooth-tipped setae radiating dorsad and a backwardly 

 directed fascicle of long brown glochideal setae ; below the dorsal setae there is a tuft 

 of fine silken threads. The neuropodia carry furcate setae with or without an 

 accessory tooth (Plate I., fig. 4). The portion of the notopodium from which the 

 flabellum arises is adnate to the elytrophore. 



Pontogenia indica, Grube Plate L, fig. 5. 



Grube, 'Ann. Semp.,' 1878, p. 18; Herdman, "Palmyra ami/era," 'Ceylon Pearl Oyster 

 Report,' Part I., Narrative, 1903, p. 75. 



The close resemblance between Pontogenia indica and Palmyra aurifera (see 

 Grube, op. cit., pp. 13-14) is one of the remarkable facts of Polychaet taxonomy. 



The specimen was obtained from a living coral block in 6^ fathoms, one mile north 

 of Muttuvaratu Paar, Station LIX. It measures 20 millims. in length and has 

 45 segments. The head is retracted within the anterior segments and beneath the 

 anterior elytra, the second pair of elytra overlapping the ommatophores. The 

 ceratophore is marked off from the frontal border of the prostomium and the 

 ommatophores extend to this level. The palps are beset with longitudinal rows of 

 delicate recurved papillae. By pressing the ceratophore back a tuberculum faciale 

 with granulated surface may be seen extending from the prostomium to the anterior 

 border of the mouth. Each ommatophore carries two eyes, but as the pigmented 

 areas overlap there appears to be only one eye in certain lights (Plate I., fig. 5). 

 The paleae which form flabella projecting over the elytra are utrinquedentate, as 

 described by Grube. The dorsal setae which occur in addition to the paleae are long, 

 delicate, colourless and numerous, and constitute a tela tomentosa over the elytra, 

 concealing the latter, but not felted together so as to form an inextricable tangle. 

 The two rows of distantly placed denticulations with their points directed towards 

 the apices of the paleae are not always visible in one view, and the paleae then appear 

 to be denticulate along one side only. 



Family: POLYNOID^E. 

 Iphione muricata, Savigny Plate I., fig. 6. 



Polynoe peronea, Schmarda, 1861 ; ' Neue Wirbellose Thiere,' ii., p. 157. 

 Locality : Gulf of Manaar. One specimen of the typical yellowish brown colour ; 

 length 17 '5 millims., breadth over the setae 8'5 millims. The head is withdrawn 



