326 TBOCHOSPHEEE. 



anterior eye being behind the middle line. From the first foot three strong curved 

 bristles project forwards at the side of the palpi. These bristles have well-marked 

 spinous rows. The palpi have tapering extremities. The dorsal bristles are slender 

 and tapering, with distinct rows of spines, which from the dorsum appear as opposite. 

 The tips of the ventral bristles are simple, and the spinous region shorter than in the 

 first species, and from the dorsum the spinous rows seem to show an alternate arrange- 

 ment. 



When eight pairs of feet are present, and the tentacles, palpi, and the anal cirri 

 fairly formed, the dorsal bristles show a tendency to finer rows of spines, so that they 

 approach the condition in such as Lepidonotus and Gattyana. 



At the stage in which the two caudal cirri appear as two broad short processes there 

 are at least four scales, and the tentacular cirri are present. 



The head is truncated in front, and has a curious spectacle-mark ventrally (Plate 

 XXVI a, fig. 16), a black spot being situated in each lateral dilatation. The spectacle- 

 mark is outlined with black and touched with reddish brown, the rest of the head (in 

 spirit) being pale. It is bounded by the black belt at the ciliated ring, while behind 

 is the reddish-brown pigment, followed by streaks of black, which also occur at the 

 segment-junctions. The caudal cirri are yellowish. On the dorsal surface (fig. 15), 

 again, are two black eyes, obliquely situated on each side anteriorly, a long interval 

 occurring between them and the black belt of the ciliated ring. Behind the black is 

 a definite reddish line. The bristles project considerably on each side, so that the stage 

 is a nectochgete one. 



At a slightly later stage (Plate XXVI a, fig. 17) the palpus arises on each side 

 at a black spot, which at first marks the budding organ. The growth of the various 

 appendages, however, is irregular, since in this instance the caudal cirri were less 

 advanced than in those without elevation of the area of the palpus. Coincident with 

 the projection of the palpus is that of the median tentacle, which forms a rounded boss. 



Pallas (1766) made his description of Harrnothoe imbrieata (his Aphrodita lepidota) 

 from an incomplete and probably young specimen (as Malmgren says) with fourteen pairs 

 of scales, the latter being partly ciliated, though in the description this is not alluded 

 to, and the ventral view mistaken for the dorsal (pi. v, fig. 2). He thought it might 

 readily be distinguished by its longitudinal black band on the dorsum. It occurs, he 

 says, frequently in the North Sea, between Britain and Belgium. 



The Polynoe fulgurans of Ehrenberg, 1 one third of a line long, may be the pelagic 

 young of this or an allied form. 



De Quatrefages considered the Polynoe fas ciculos a and the P. maculata of Grube 2 

 as pertaining to this species, but the descriptions are so vague that doubt exists. 



This was the only member of the group procured in the Siberian Expedition of 

 Gerstfeldt, as described by Grube. De Quatrefages, in his work on the c Anneles ' 



1 c Das Leuchten des Meeres/ 1835. 



2 < Acfcin., Echin., u. Wurm./ p. 87, 1840. 



