1 86 ANDREWS. [Vol. VII. 



A minute pore is found leading in through the cuticle to the 

 axis of the lens. A double contour between lens and rods is 

 regarded as a continuation of the cuticle inward to line the 

 whole retinal cup, and hence the soft lens is interpreted as a 

 secreted mass external to the cuticle and comparable to the 

 mucous the animal secretes elsewhere. 



This separating layer is evidently what I have regarded as 

 merely the dense or more firmly coagulated superficial part of 

 the lens next the rods, and not as a continuation of the cuticle. ^ 



The structure of the eyes of the Eunicidae as discovered by 

 Jourdan finds, in some respects, a parallel in the case of one of 

 the Chloraemidae, Siphonostoma diplochcBtos, as elucidated by the 

 same author (6). Here also the retinal cells are pigmented, 

 and their enlarged bases are connected with the brain by pig- 

 mented nerve fibres. There is also a refractory mass composed 

 of radiating elements or rods filling the retinal cups. Whether 

 there is any connection with the epidermis or not does not 

 appear from this preliminary note. 



Syllid.^. 



Autolytus prolifer Langerhans ? 



The beautiful adult forms of this annelid were taken in im- 

 mense numbers during July i to 15, 1889 and 1890, swimming 

 at the surface in the evening. 



The females appear to be much less numerous than the males, 

 but this may be in part due to their tending to sink below the 

 surface. The males present two marked color varieties, the one 

 bright red, the other green. No other differences are apparent, 



^ The eye of the Eunicidae appears to be repeated in the Nephthydae, to judge 

 from the figures given by Graber for the eye of Nephthys 7nargaritacea ; these are 

 strikingly Hke Fig. 34 of the present paper. No connection of lens and cuticle was 

 seen, however, but the rods and retina are represented just as in that author's figure 

 of Eunice. An examination of Nephthys bucera and of N. picta failed to furnish 

 eyes for comparison with the above. 



2 This identification is only provisional : the males are much like the Polybostrichus 

 of Miiller and of Keferstein, which is but the male sexual form of A. prolifer of 

 Langerhans. This annelid has been noted on our coast by Webster as A. hesperidum, 

 Clpd., and also by Verrill as A. varians, I believe. A non-sexual form producing 

 several of these males was observed. This seems, however, to differ much from the 

 Syllis prolifera of older authors. 



