HOYLE: EEPORTS on the CEPIIALOrODA. 63 



whilst the two extreme ones measure 0.35 nun. in diameter. The organs are 

 embedded in the connective tissue capsule which lies over the sclerotic coat o 

 the eye. 



Minute Structure (Figs. 9, 10). 



In the deepest portion of the larger organs is a lenticular mass of tissue 

 about 0.13 mm. in diameter and 0.07 mm. in thickness (I.). It is made up 

 of irregularly shaped masses which are to all appearance structureless, of a 

 pale yellowish-gray color and not affected Ijy the haematf)xylin with which the 

 preparation has been stained. Beneath this mass is a thin layer of connective 

 tissue (c.) with sparsely scattered nuclei in it, whilst above and around it is a 

 thicker layer of connective tissue (d) with very numerous, deeply stained 

 nuclei of variable shape, mostly, however, with their longer axes parallel to 

 the surface of the organ. 



The greater part of the organ is made up of a series of delicate filjrils (/.). 

 These arise from a thin structureless layer lying upon the connective tissue 

 coat of the lenticular mass just described. They are of extreme tenuity and 

 radiate outwards in all directions from horizontal to vertical, producing in the 

 section the appearance of a fan. The fibrils are, however, none of them 

 exactly straight, but curved in such a way that in the deeper half of their 

 course they are concave towards the axis of the organ and subsequently convex, 

 becoming generally concave again where they merge into the clear zone to be 

 described below. The structureless mass from which they arise does not take 

 up the staining fluid, but the greater part of the filjrils has become very 

 deeply colored. The terminal fifth of each fibril remains unstained and ap- 

 pears to be thinner than the remainder, so that a narrow clear zone appears 

 in the section to bound the surface of the organ {z.). 



On that side of the organ which may be called the inner, as it is turned 

 towards the remaining organs of the same eye, the connective tissue (f'.f.) en- 

 croaches to some extent over its surface in the form of a thin layer gradually 

 becoming thinner and ceasing at a distance of aljout 0.01 mm. -from the edge. 

 This overlapping portion of the connective tissue contains a few nuclei. 



On the other side of the organ it becomes flattened out and extemls as a hori- 

 zontal prolongation for a distance nearly equal to the diameter of the lenticular 

 portion. This part consists of delicate fibrils (h.f.) very like those described 

 above, but interspersed between them are strands of the yellowish-gray material 

 described above as forming the small lenticular body in the deepest portion of 

 the organ. Ovoid nuclei are scattered here and there among them. The 

 arrangement of the fibrils here is very nmch less regular than in the central 

 fan-like portion. 



The smaller organs (Fig, 10) present a certain resenjblance in structure to 

 the large ones above described. In the deepest portion is a lenticular mass 

 (1-) of unstained tissue very closely resembling that above described. It is, 

 however, broader and flatter not only in relation to the size of the organ, but 

 also absolutely, measuring 0.2 nun. in diameter and about 0.05 mm. in thick- 



