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5. DescripTions oF New SPECIES OF PLANARIID& COLLECTED 
IN THE SanpwicH Istanps*. By W. Harper PEASE. 
(CommunicaTeD By Dr. J. E. Gray.) 
(Annulosa, Pl. LXX.) 
1. Peasta RETICULATA (Pl. LXX. figs. 1, 2). 
Body oval, smooth, pellucid, no appearance of convexity above or 
beneath. Margins crenulate and undulated. No eyes visible. 
Dorsal tentacles a little anterior to the middle, small, cylindrical, and 
tapering slightly to an obtuse point, non-retractile. Beneath there 
is no appearance of a mouth ; but in the thin transparent substance 
of the body,.centrally, may be seen a set of whitish organs, which 
are delineated in the drawing. In colour this species varies from a 
light yellow to a yellowish fawn, closely veined with light brown ; 
veins ramifying over the entire surface, and spotted with darker 
brown. 
The spawn is deposited on the under side of stones, and is multi- 
spiral and closely coiled. The animals are very active, swimming by 
lateral undulations, and creeping in the same manner. 
2. Prasta inconspicua (Pl. LXX. figs. 3, 4). 
Body thin, flat above and beneath, smooth, elliptically oval, with 
both ends equally rounded. No foot or tentacles. On the anterior 
end is a cluster of minute black dots, which may possibly serve as 
eyes, as they occur in every specimen of this and others observed. 
Colour pale, translucent. 
Length 7 lines. 
Under stones at low-water mark. 
3. Peasta TENTACULATA (Pl. LXX. figs. 5, 6). 
Form oval, strongly depressed, smooth, thin as common writing- 
paper, subtranslucid. Margins strongly undulated. No visible 
eyes. The anterior end is slightly emarginate, and has two blackish 
contiguous tentacular processes, which are non-retractile. The 
whole upper surface is covered with rather closely set tentacular pro- 
cesses, which are retractile, cylindrically tapering or clavate, and 
mucronated ; the mucronated tips retractile in the large part. No 
foot or appearance of external branchie. Colour above light fawn, 
with pinkish margins and darker processes. Beneath paler than 
above. f 
This singular animal occurs rarely under’ stones at low-water 
mark. It swims by the undulations of its mantle, and when creep- 
ing the same undulations take place. On close examination of the 
* This series of animals appears to differ from any of the genera which have 
come under my observation, and to form a group by themselves, to which the 
name PEAsi1A may be applied: the descriptions and figures afford the best 
generic characters. I have added a specific name to each species for the purpose 
of distinguishing them.—J. EZ. Gray. 
