RATTULID#. 69 
This species has manifest affinity with porcellus; but it is much slenderer, and its 
proportions are different. The width of the body to its length (exclusive of the foot) is 
as 1:4; whereasin porcellus it is as 1: 24. The toe is here beset with a short sub-style 
on each side (as in Mastigocerca); whereas in porcellus I can see no trace of these. 
The lorica, moreover, is not elevated into any sensible dorsal ridge. In all other re- 
spects it appears to agree with the preceding, except in being somewhat longer. 
The species first occurred to my notice in water from Woolston Pond, sent me in 
September by the courtesy of Miss Davies. Several examples occurred, but all dead. 
A few days later I found it alive in water sent by Mr. Bolton from Birmingham, as well 
as another dead.—P.H.G.] 
Length, ,}, to 4; inch; depth, 1, to gt, inch. Habitat. Weedy pools. Wool- 
ston: Sutton Park and Coleshill, Birmingham (P.H.G.). 
C. BRACHYURUS, Gosse. 
(Pl. XX. fig. 21.) 
Monocerca brachyura C . ‘ Gosse, Ann. and Mag. Nat. Hist. Sept. 1851. 
(SP. CH. Body cylindric, short, plump, decurved ; lorica not ridged ; head without 
spines ; toe-length less than the depth of the body. 
This species I described in 1851 from a single example taken on Hampstead Heath. 
It died before I had completed my observations; but I have since seen it on repeated 
occasions, from various localities, though always scarce. With much resemblance to 
C. porcellus, it is notably smaller; there is no trace of ridge; the twofold toe, though 
exactly similar, is proportionally shorter; the front is obtusely truncate, seen dorsally 
and laterally, and is destitute of projecting spmes. When viewed endwise (as on many 
occasions), the transverse outline appears quite circular, so far as the back and sides are 
concerned. A long depending brain carries a great red eye at its tip. The singular 
appearance of a second eye in the breast, mentioned in my original diagnosis, occurred 
in no other specimen ; it must have been illusory, though unaccountable. The viscera 
agree with those of porcellus; the contractile vesicle very large. The toes are almost 
always thrust up under the belly. 
In manners this varies much from its lively predecessor, for though constantly in 
motion it is singularly slow and sluggish, creeping to and fro on the leaves of the 
milfoil, nibbling ever as it goes.—P.H.G.] 
Length (without toe), +1, inch; toe, ;},inch; total,,;4, inch. Habitat. Hampstead 
Heath ; Sandhurst; Woolston; Caversham (P.H.G.): pools: rare. 
C. cAviA, Gosse, sp. nov. 
(Pl. XX. fig. 22.) 
[SP. CH. Body elevated and globose, very protuberant behind the foot; lorica 
without ridge or frontal spines. 
In the summer of 1885 Mr. Henry Davis kindly collected water for me near Snares- 
brook in Epping Forest. Among other treasures found therein I met with this pretty 
little creature, which at first I was inclined to identify with C. brachyurus. It differs 
from it in form, however ; the great elevation of its hinder quarters, and particularly the 
development of its buttock into a great plump breech, gives it the aspect of a squatting 
mouse or guinea-pig, and makes the double curved toe proceed (in appearance) from a 
notch in the belly, far forward. The mastax agrees with that of its congeners, of 
moderate size; but the brain is very large, and so is the eye at its point. The stomach 
was ample, filled with yellowfood. Face truncate, slightly prone. The little thing was 
rather swift at first, but not wild.—P.H.G.] 
Length (without toe), ;}, inch. Habitat. Epping Forest (P.H.G.). 
