HARMOTHOE IMBEIOATA. 321 



the condition of the alimentary canal, and the development of the feet. His species 

 had two pairs of eyes. 



Claparede 1 gives the early stages of a Polynoe up to the formation of feet and 

 bristles. His example had eleven pairs of feet. 



Yiguier 3 refers to a pelagic Polynoe of sixteen segments, but which, he says, showed 

 no larval appearance. The feet and the ventral bristles are comparatively long. It is 

 in all probability a post-larval Polynoe from the Bay of Algiers, as Marenzeller also 

 thinks. 



Dr. W. Michaelsen 3 describes a pelagic polynoid from Ceylon (Drieschia pelagica), 

 in which the foot is simple, with very long hair-like bristles, and only a few shorter 

 thicker forms. These apparently represent the ventral division of the foot, and only a 

 single spine is present. The tentacular cirri and dorsal cirri are very long. 



Marenzeller 4 gives an account of a pelagic form of twenty-four segments procured 

 by the Prince of Monaco, in 48° 50' lat. N., and 21° long. E. of Greenwich, under the 

 name of Nectoclideta Grimaldii. It is characterised by the great elongation of the inferior 

 bristles. Scales absent, palpi and cirri smooth. 



Fewkes 5 described a young Polynoe with only three pairs of feet. 



Too little is yet known of the pelagic forms described by Michaelsen and Marenzeller 

 to speak with certainty of their precise relationships. The presence of only a single 

 spine and the simple nature of the foot in Drieschia are features which diverge from the 

 ordinary types. 



Prof. Y. Hacker of Freiburg gave in 1896 6 the results of his studies of the larvae of 

 Polychseta at Naples. In the Aphroditidse he describes three stages of a Polynoe, viz. 

 the trochophore, metatrochophore, and nectochgete 7 stages. In the Aphroditaceans 

 the trochophore moves at first by aid of its cilia, and then the bristles develop secondarily 

 and enable the post-larval stage to assume great activity during its pelagic life. His 

 species was probably Polynoe reticulata. 



The ovaries of Harmothoe imoricata form a series of lobulated organs stretching 

 from the seventh foot (which has a segmental [nephridial] papilla, as has also the sixth) 

 to the posterior end. They are small anteriorly in the region of the proboscis, though 

 as a rule they do not reach this part, but attain in January a considerable bulk through- 

 out the rest of the body, again diminishing posteriorly. 



The eggs become prominent in November, being coarsely granular, with a distinct 

 nucleus and nucleolus (Fig. 27). They seem to have a hyaline connecting substance, 

 to which perivisceral corpuscles attach themselves. They vary in size, the smaller being 



1 'Beobach./ 1863, p.80, Taf. viii, f. 1—11. 



2 < Archiv. de Zool. exper./ vol. iv, 1886, p. 416. 



» ' Jahrb. d. Hamburg. Wiss. Anstalt/ ix, 2, 1892, p. 6, figs. 15—18. 



4 c Bullet, de la Soc. Zoolog. de France/ 1892, p. 173. 



5 'Bull. Mus. Comp.Zool. Harv. Coll. Carnb./ v, 11, 1883-5, 



6 < Zeitsch. f. w. Zool./ Bd. lxii, pp. 74—168, Taf. iii— v. 



7 Nrixeiv, swimming or pelagic ; and x aiTr l> bristle. 



