POLYCH^ETA. 251 



projecting base which lies obliquely outwards and backwards when seen from above. 

 The dorsal cirri are highly deciduous. They exceed the length of the parapodium 

 (Plate I., fig. 12). The dorsal ramus and elytrophore of a foot from an elytra-bearing 

 segment appear to carry long vibratile cilia. No tubercles were observed on the 

 segmenta nuda. The ventral ramus is richly furnished with decussating muscles. 

 The elytra are orbicular, glabrous, with few " veins " ramifying out from the scar. 



Harmothoe dictyophora (Grube) -Plate I., figs. 14 to 16. 

 Polynoe dictyophorus, Grube, ' Ann. Semp.,' 1878, p. 44. 



Locality : East side of Cheval Paar. Length 12 millims., breadth over the setse 

 475 millims. 



Prostomium normal, anterior eyes placed in the centre of the lateral border 

 (Plate I., fig. 15). Antennae ciliate ; palps beset with numerous minute blunt 

 papilla? ; dorsal cirri densely ciliate, the long filiform papillae ceasing at the base of 

 the terminal filament ; no dilatation below the terminal filament. Dorsal setae 

 numerous, verticillate spinulose, but the whorls are not complete, only occupying 

 three parts of the circumference of the setae ; the shorter setae of the dorsal bundle 

 are distinctly stouter than the ventral setae ; ventral setae without exception con- 

 spicuously bidentate, dilated at a point variously remote from the apex and spinulose 

 thereafter (Plate I., fig. 16). The spinulose tract of the superior ventral setae is much 

 longer than that of the inferior. 



Thirty-five segments ; fifteen pairs of elytra covering the back. Exposed portions 

 of the elytra divided into polygonal areoles carrying chitinous spines and filiform 

 papillae ; some of the areoles are densely pigmented dark brown. Some of the spines 

 are bifurcated, such spines being particularly prominent on the round elytra of the 

 first pair. The outer fimbriae of the elytra are longest and densest, these are followed 

 posteriorly by a group of papillae with globular tips, and these again by shorter 

 filiform papilla? (Plate I., fig. 14). It should be noted further that the ventral cirri 

 also carry short blunt papillae, scattered and not very numerous. 



Grube founded the species upon a single elytron. 



Hololepidella, n. gen. 



A Polynoid ; antennae arising at a lower level than the tentaculum impar ; segments 

 and elytra numerous. 



Hololepidella commensalis, n. sp. Plate I., figs. 17 to 20. 



Station I., off Negombo, 12 to 20 fathoms, on Clypeaster humilis. 

 This species appears to be allied to Polynoe venosa, Grube (' Ann. Semp.,' p. 43), 

 in which however there were only 18 pairs of elytra and 42 segments in the single 



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