138 Macieay Memoriat Vouume. 
ramifying over the dorsal surface of the intestine, pass round its lateral borders and 
extend inwards for some distance on the ventral surface. 
The receptaculum seminis is of oval outline, with thinner walls than in the 
Australian species. It is situated a little to the right of the middle line, immediately 
behind the intestine. The ovary, closely adherent to the receptaculum seminis, is of 
oval shape, and very closely resembles the corresponding organ in the Australian 
species. 
T. Jheringwt was found by Dr. v. Jhering in Brazil in the branchial cavity of a 
species of Ampullaria. It differs from 7. Semperz, Weber—(1) in the absence of 
eyes; (2) in the form of the cirrus, which is very much wider at its proximal end, 
curved instead of straight, and with a terminal introvert of a different form; (3) in 
the first pair of testes being placed much further back ; and (4) in the shape of the 
ovary. 
7. TemnocerHata Nov#-zeatanpia. Plate x. figs. 4, 7 and 11; Plate x1. fig.1; Plate 
xu. figs. 17 and 18; Plate xiv. figs. 2 and 3. 
Temnocephala Nove-zealandie, Haswell, “On 7% emnocephala,” ete. p. 284, pl. xxi. 
figs. 10 and 19. 
The most characteristic external feature of this species is the possession of six 
tentacles, in which, however, it resembles 7. comes. In size 7. Nove-zealandie is 
sometimes little less than 7. fasczata, some specimens attaining a length of half an 
inch in the contracted condition, but is usually much smaller, in accordance with the 
smaller size of its crustacean host. In the larger specimens the dorsal surface is 
brownish or slate-colour owing to the presence of irregularly arranged granules of 
pigment beneath the basement-membrane and muscular layers ; but small specimens 
are nearly or quite devoid of pigment except in the eyes, which are very small. In 
the pigmented specimens the course of the dorsal nerves, with the network to which 
they give rise is readily traceable owing to the pigment being absent or little 
developed along the course of the branches. In the unpigmented species a reddish 
tinge is sometimes given to the middle of the body by the colour of the alimentary 
epithelium. External vibratile cilia are not present, but the tactile cones are very 
numerous and prominent, particularly on the tentacles. The intestine has usually 
only three or four septa, but sometimes there are five or even six. The most anterior 
of the unicellular integumentary glands are aggregated together into definite rounded 
eroups. The anterior testis is narrow, situated opposite the posterior half of the 
intestine, not reaching much behind the posterior border of the latter ; the posterior 
testis is oval, nearly or quite completely behind the intestine; neither of them shows 
