POTTS—POLYCHATA: AMPHINOMID, 367 
The head bears a median tentacle of greater size than that described for the typical 
form, attaining nearly half the length of the caruncle. The branchize are similar to 
those of the parent species, but have a smaller number of terminal branches, never 
rising above fifteen. 
The arrangement of the sete is not so compact, nor is there the white silky 
appearance so striking in other members of the genus, but they possess a flexibility 
like that in Notopygos variabilis. The finely attenuate type of dorsal seta resembles that 
of H. carunculata in possessing a roughened or rather finely serrated inside edge. The 
ventral sete (Pl. 46. fig. 11) possess a more incurved apical hook and more distinct 
and numerous serrations than those described above. 
Locality. Single specimen from Egmont Reef. 
12. Hucarunculata grubei, var. minuta, var.n. (Plate 45. figs. 12, 18.) 
Measurements. Length 16 mm., breadth 2 mm.; no. of segments 34. 
This variety possesses a characteristic appearance, which is due to the slender body and 
‘the long tufts of dorsal setze, whose length exceeds the width of the body (PI. 45. fig. 12). 
The colour is pale, but the longitudinal striz are regular and purple in hue, recalling 
the colour-patterns described above. There is an absence of yellow spots of pigment. 
The caruncle (Pl. 45. fig. 13) is similar to that described for var. gracilis; the lines 
of the secondary branching are followed by delicate traces of purple pigment. The 
median tentacle has a length equal to one-third of that of the caruncle and is distinctly 
moniliform. ‘The lateral tentacles and palps are not quite so long. 
The dorsal setigerous lobe is very prominent and bears a jointed dorsal cirrus. The 
setze are like those described for the last variety. The ventral sete are very slender, 
and sometimes end in a pointed hook. The serrations on the inner side are distinct 
and vary greatly in number. A second type, apparently derived by excessive elongation 
from the first, is met with, but rarely. 
Locality. Single specimen fromi Amirante I., E 11, dredged in company with 
Chleia fusca and Notopygos hispida. 
Genus EURYTHOE, Kinberg. 
13. Eurythoé complanata (Pallas). 
14. Hurythoé alcyonia (Savigny). 
15. Hurythoé pacifica, Kinberg. 
These three species comprise all the common coral-reef-haunting members of the 
genus, and present such close resemblances to each other as to give grounds for re- 
garding themas a single widespread species. 2. complanata was described originally from 
the West Indies, but Baird has pointed out that its range extends as far as Australia 
and Zanzibar. E. alcyonia has, so far as I know, been identified by previous authors 
only in the Red Sea. It is perfectly clear, however, that this collection from the 
Maldives and Seychelles contains a very large number of forms which can only be 
referred to the last-named species *. Z. pacifica occurs throughout the Pacific Ocean 
and was also obtained from the Bermudas by the ‘ Challenger.’ While, then, to a slight 
* McIntosh, Voyage of H.M.S. ‘ Challenger,’ Annelida Polychaeta, pp. 27-29. 
