Haswett—A Monograph of the Temnocephalee. 139 
any trace of lobulation. The ejaculatory sac is short and rounded. The cirrus, when 
at rest, is almost parallel with the long axis of the body, with the base forwards and 
the apex backwards; when extended it assumes a more oblique position. It is 
strongly curved, wide proximally, narrowing gradually distally, with a very definite 
introvert armed with numerous pointed spines of considerable length ; it presents a 
considerable amount of variation in the length and arrangement of the spines. (Plate 
xi. figs. 17 and 18.) 
The vitelline glands are quite irregularly arranged in broad lobes. The 
receptaculum vitelli is not median, being situated to the right of the middle line. 
The feature of the internal structure which is most characteristic of the species is the 
large muscular vagina already described (p. 129) with its series of chitinous teeth. 
(Plate xiv. fig. 3.) 
The eggs, which are small and pear-shaped, are attached by a short stalk situated 
at one end, usually to the anterior part of the carapace or to the great chels of the 
host; they are not connected together in any way like the eggs of some of the 
Australian species. The egg opens by the formation of a transverse fissure, resulting 
in the separating off of the distal end of the shell as a sort of operculum. When 
I had the opportunity of examining them (in the month of February) all the eggs 
either contained fully formed embryos or were empty, the young having escaped. 
The young specimens differ from the adult in the absence of the intestinal septa and 
the reproductive organs as well as of the pigment; they have no cilia. The terminal 
part of the cirrus with its spines is formed before the appearance of the toothed vagina. 
This species lives on Paranephrops neo-zealanicus and P. planifrons, chiefly on 
the surface of the great chelze among the hairs, and appears to be widely distributed 
in the rivers and lakes of New Zealand, both in the North and South Islands. 
8. TemnocepHata Enea. Plate xm. fig. 20. 
The largest specimen of this species which I have obtained is scarcely three 
millimetres in length in the contracted state. The general shape is similar to that of 
T. minor; there are five subequal slender tentacles, which are much shorter relatively 
than in that species; the sucker is relatively large, its diameter being nearly equal 
to a third of the length of the body. Pigment is completely absent, except in the 
pigment-cups of the very small eyes. Vibratile cilia are completely absent. The 
intestine appears to present about seven constrictions similar to those seen in most of 
the other species. The excretory sacs have their external openings further apart than 
is usual, quite close to the lateral borders of the body. The testes are oval, the long 
axis of the anterior testes being parallel with the long axis of the body, while that of 
