No. 2.] EVES OF POLYCHyETOUS ANNELIDS. 205 



Pedophylax longiceps. 



As is well known, the larvae remain attached to many of the 

 parapodia of the mother, one on each. The epidermis on a 

 rounded elevation, apparently around the opening of the nephri- 

 dium, secretes a cement which fastens this part of the parent to 

 the posterior end of the larva. 



When 2 mm. long, the larva has four dorsal eyes, the anterior 

 larger and farther apart. There is now a mouth, a digestive 

 tract full of purple yolk, and four well-marked somites without 

 parapodia or setae. 



Each eye is a collection of red-brown pigment granules, which, 

 upon maceration, seem to be in the cuticular ends of a few cells, 

 in the youngest posterior eye perhaps in only one cell. As 

 far as the limited observations extend, these eyes agree with the 

 earliest larval eyes of Procaerea. 



The same may be affirmed of the larval eyes of the unde- 

 scribed Polydora mentioned in the previous part of this paper. 

 In larvae with thirteen somites and long provisional setae there 

 are four eye spots, the anterior larger and farther apart. In 

 section each eye has a lens in contact with the cuticle and partly 

 surrounded by a cup of brown pigment. 



In the adult the eye retains this simple character, though it 

 sinks away from the cuticle and, as far as known, loses all 

 connection with it, as in Spio (Fig. 71). 



Leprcea rubra f 



Small annelids that may be the young of this species are 

 found abundantly upon the wharves. They have a conspicuous 

 series of dark red spots on the dorsal and lateral aspects of the 

 buccal somite posterior to the origin of the tentacles. These 

 spots number about thirty, and are arranged in two irregular 

 transverse rows. 



Each spot (Fig. 66) is a somewhat hemispherical clear mass 

 partly enveloped by a cup of large red spherules, and produced 

 as a delicate filament that extends nearly or quite to the cuticle. 



The pigment cup is buried deeply in the epidermis where 

 continuous with the brain, and may open in various directions, 

 so that the lens stalk may be variously curved on its passage 

 toward the cuticular surface. Depigmentation reveals no nuclei 



