122 Transactions of the South African Philosophical Society. 
species (A. mouwhote and A. piperata) were: (1) The pleuropodia in 
both cases start from about the first third of the body and run 
backwards within a few millimetres of the end of the foot, being 
quite separate throughout their entire length; (2) In both, the 
mantle, shell, and visceral mass are much more posteriorly situated 
than in, e.g., A. limacina, and, in co-ordination with this, the genital 
opening is peculiar in being located somewhat anteriorly to the 
mantle cavity. (3) The most striking point is the position of the 
rhinophora, which are situated close together between the anterior 
ends of the pleuropodia. 
The genus Paraplysia was established and put on a level with 
that of Aplysia, Dolabrifera, Notarchus, &c., by Pilsbry, as possess- 
ing the following characteristics : General form oval; buccal tentacles 
rather large, widely separated and pointed ; rhinophores small, conic, 
close together, situated between the anterior ends of the pleuropodial 
lobes. Pleuropodia arising at the anterior third of the animal’s 
length, well separated at their origin and throughout, only uniting 
at their union with the foot very near to its posterior extremity. 
Mantle large, posterior exposed, with posterior excurrent siphon, 
and apparently covering the gills; the genital pore slightly in front 
of its anterior edge, not covered. 
Shell about a third of the body, concave, subquadrate. The 
remarkable features of this type are: The position—unique in the 
Anaspidea—of the rhinophores between the anterior ends of the 
pleuropodial lobes, the latter being completely free; the posterior 
situation of the mantle and the short, oval form of the body. The 
posterior end of the foot is free from the viscal mass, which over- 
hangs it. 
Paraplysia Low, n. sp. 
Turning now to the features of the animal to be described, it 
will be seen that these generic characters may require to be some- 
what modified. 
External Features (Pl. XVI. Figs. 1 and 2).—The general outline of 
the body (in the contracted condition after preservation in 2 per cent. 
formalin), while resembling the oval form of P. piperata and 
P. Mowhoti, approaches that of the more elongated form of the true 
Aplysia (Tethys of Pilsbry). 
The pleuropodia also resemble those of, ¢.g., Aplysia depilans, being 
as well developed vertically and longitudinally and free from each © 
other throughout their entire length, but being, relatively to the total 
length of the body, somewhat longer. Their height is about one 
third of their length. They begin at the anterior fourth of the body 
and end at a point near the posterior extremity. 
