HOYLE: REPORTS ON THE CEPHALOPODA. 63 
Whilst the two extreme ones measure 0.35 mm. in diameter. The organs are 
embedded in the connective tissue sapsule 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 (/.). It is made up 
of irregularly Shaped masses which are to all appearance structureless, of a 
pale yellowish-gray color and not affected by the haematoxylin with whieh 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 (c!) 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 fibrils (f.). 
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 fibrils 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 (2.). 
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 (%.c.) en- 
Croaches to some extent over its surface in the form of a thin layer gradually 
becoming thinner and ceasing at a distance of about 0.01 mm, from the edge. 
his overlapping portion of the connective tissue contains a few nuclei. 
On the other side of the organ it becomes flattened out and extends 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 much less regular than in the central 
fan-like portion. 
The smaller organs (Fig. 10) present a certain resemblance 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 mm, in diameter and about 0.05 mm. in thick- 
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