164 Transactions.— Zoology. 
Female. (Pl. XX., fig. 8.) In the article on ‘ Crustacea,” in Todd’s 
Cyclopedia of Anatomy and Physiology, M.-Edwards says that there is a 
striking analogy between the male and the female reproductive organs in 
the Crustacea. This is certainly true as far as Paranephrops setosus is con- 
cerned, for the female reproductive organs are formed on the same plan as 
the male. They differ very much in appearance, however, for the ovaries 
(ov) are much shorter and thicker than the testes. The two anterior por- 
tions are but slightly separated at their anterior ends, and they approach to 
one another and soon coalesce, so that there is no part which can properly 
be called a commissure. Behind this they are at first widely separated, so 
that a hollow is formed in which the heart rests. Posteriorly they rapidly 
become narrower and approach closer to one another, so that they lie one 
on each side of the intestine. From about the centre the two oviducts arise 
and proceed without any convolutions direct to the openings on the basal 
joints of the second pair of walking legs. 
I have not had an opportunity of observing how the young are 
attached to the mother after birth, but according to Mr. Wood-Mason* 
they fix themselves to the swimmerets of the mother by the hooked 
ends of their hinder ambulatory legs, and not by the chele as in 
Astacus fluviatilis, 
DESCRIPTION OF PLATES XIX.—XXI. 
LATE XIX. 
In all the figures, ez, exopodite; en, endopodite; exp, coxopodite; bp, basipodite ; 
ip, ischiopodite ; mp, meropodite ; = earpopodite; pp, propodite; dp, dactylopodite. 
Antennule of left side (x 
Antenna of left side (x ag ; 99, opening of green gland. 
andibles of left side (x 2); p, palp. 
First maxilla of left side (x 2). 
Second maxilla of left side (x 2) ; sg, scaphognathite. 
First maxillipede of left side (X 2) ; ep, epipodite. 
Second maxillipede of left side (x 2) ; pb, podobranchia; ab, arthrobranchia. 
Third or external maxillipede of left side (x 2); czs, coxopoditic sets; pb, 
podobranchia ; ab, arthrobranchia. 
Rostrum, side view (x 2). 
d 
vno? 
e 
Pirate XX. 
Fig.l. Third abdominal appendages of male (x 2); czp, coxopodite; bp, basipodite ; 
ex, exopodite; en, endopodite. 
2. Third abdominal appendages of female (x 2). Letters as in figure 1. 
3. The sixth abdominal appendage (x 2); exp, coxopodite; ex, exopodite; en. 
endopodite. 
4. Telson (x 2). 
* Ann, and Mag. Nat. Hist., 4th series, vol. xviii. (1876), p. 306. 
