282 



ANDREWS. 



[Vol. V. 



figure (Fig. 2 in text). Here it must be noted, however, that 

 the relations of the pigment in the cell cannot be made out satis- 

 factorily from sections, and are hence put into the 

 diagram as they probably exist, judging from suc- 

 cessive tangential sections. 



In sections that are not stained the pigment of 

 each refracting cell has a decidedly golden yellow- 

 tinge as compared with the dark red granules in 

 the other cells of the eye. Some common epithe- 

 lial cells have this same yellow pigment ; others, 

 dark pigment. 



The characteristic dark red spots, 2 to 4 mm. in 

 size, upon the body of this animal, one on each 

 side, both dorsal and ventral to the parapodial 

 region of each somite, were also examined in sur- 

 face views and sections, but proved to be merely 

 special aggregates of the epidermal glands, each 

 Fig. 2. surrounded by pigmented, epidermal cells, so that 



a surface view may present a reticulum of pigment with clear 

 interstices. This was seen by Schmarda, who suggested they 

 might be eyes. 



A much smaller Annelid found with the last has equally 

 interesting branchial eyes. This species seems to be Ehler's 

 DasycJione conspersa (8), and is perhaps the same as the Sabella 

 melania of Schmarda (14), while having many resemblances also 

 to 5. {Dasychone) cingidata, Grube (6). 



Along: the outer face of the branchia is a series of filamentous 

 processes in pairs, and usually, not always, in the interval between 

 two successive pairs, but on the lateral faces of the branchial 

 stem, there is also a pair of eyes, one eye on the right, one on 

 the left lateral face. On each face, then, the eyes occur at some- 

 what regular intervals of about 7 mm. 



Each is about 70 /x. wide, a prominent hemispherical elevation 

 much as in Potamilla. Here, however, the general appearance is 

 very markedly different, owing to the fact that the pigment is 

 drawn away from the surface for a distance of 16 /j,., leaving thus 

 an outer, clear, refracting layer of that thickness. This layer is 

 noticeably made up chiefly of forty or more radiating, pear- 

 shaped, very highly refracting bodies, the inclusions, with only 

 their inner tips buried in the central pigment mass. 



