Vol. IX, No. 6.] The Blind Prawn of Galilee. 237 
[N.8.] 
Typhlocaris. : Palaemon., 
Cerebral ganglia. | Oval in habe Relatively smaller 
placed close to each | and placed outside the 
other justinside the ocular peduncles in- 
side a hollow semi- 
of. 
ture place e- 
Nerves from the) 
cerebral gang. 
ia— 
| 
(1) Optic nerve | A fine nerve. | A stout nerve. 
(2) Thenerveto Astout nerve. — Finer than (1). 
the first | 
| 
ntenna : 
(3) Thenerveto. Intermediate in| Of the same size as 
the second! thickness between | (2). 
antenna | (1) and (2). | 
Structure of the ocular peduncle.—There is no trace exter- 
nally of visual structure in the ocular peduncles. 
Minute structure.—The ocular peduncle consists of the 
following layers, from without inwards :— 
(1) A thick layer of cuticle, the outer portion of which is 
mogeneous, and chitinous in structure, while the 
inner portion is finely laminated. The cuticle is 
thicker at the sides than towards the tip. 
(2) The core of the peduncle consists of a mass of cells 
hi 
more compact in arrangement than those placed 
towards the centre. The cells are separated from 
one another in many places by small irregu 
is seen in the sections. F. H. Pike (4) has a. 
a similar condition in the degenerate eyes of 
