RATTULIDA. 65 
R. tiaris, Miiller. 
(Pl. XX. fig. 13.) 
Notommata tigris : : = Ehrenberg, Die Infus. 1838, p. 431, pl. lil. fig. 1. 
[SP. CH. Body swbcylindric, largest in front ; foot thick ; toes two, stylate, long ; 
sub-styles two patrs, very short ; brain clear. 
The lorica, though subeylindric, a tube open at both ends, and bent, is wider in 
front, where a great thick head is protruded, which is invested in an inflexible shelly 
coat, running off both frontally and mentally into hard sharp points. The face between 
bears rotatory cilia set on minute eminences. Ehrenberg says ‘the outer skin appears 
somewhat firm ”’; and I have met with the empty dead shell, as evidently chitinous as 
that of an Huchlanis. The whole animal is rounded, not only as a tube is round, but 
the outline of the back is the segment of a circle, a form which is unchanged with all 
the animal’s motions. The foot appears to consist of one or two thick joints, and carries, 
besides the two toes, which are long taper styles, evenly decurved, sub-styles one on each 
side of each toe (fig. 135), usually close appressed and minute. In death the toes are bent 
up under the belly; but in life they are usually carried straight behind, quite parallel, 
or often thrown upward, without, however, changing the downward curvature of their 
points. The ample mastax (fig. 13a) is pear-shaped: the mallei straight, unequally de- 
veloped. The large brain carries a clear pale-red wart-like eye, on its point. The 
stomach is usually full of dark-brown food, coarsely granular. 
Some points in Herr Eckstein’s description of Diurella tigris make me doubtful 
whether his species and mine are identical. Mine I have had repeated opportunities of 
studying, both alive and dead.—P.H.G.| 
Length, ,3, inch, of which the toes are x}, inch. Habitat. Sandhurst, Berks ; 
Woolston, Hants: rare (P.H.G.). 
R. HELMINTHODES, (osse, Sp. NOV. 
(Pl. XX. fig. 17.) 
(SP. CH. Body very slender, especially in front, the width less than one-fifth of the 
length ; toes without accessory styles at the base ; brain clear. 
This obscure species approaches near to R. tigris in form, and also in the slender- 
ness and comparative length of the toes. It is, however, much more elongated (even 
when all allowance is made for the protrusion of the parts in death) ; and the anterior 
half is the slenderer, whereas in tigris it is the thicker. The lorica, if I am not mis- 
taken, has a long low dorsal ridge, beginning insensibly near the mid-length, and end- 
ing abruptly in an oblique angle (fig. 17) just above the foot. The short, stout, bulbous 
foot carries two long fureate toes, which are simple styles, very slender, tapering to fine 
points, decurved, closely resembling those of R. tigris. Yet I was not able to separate 
any accessory styles at the base of each, such as are seen in that species. Something 
was there ; if styles, very short and close appressed, but it seemed rather a swelling of 
the basal part of each toe. It was only a dead lorica that came under my observation ; 
from which the head-mass was extruded by decomposition, as an amorphous turbid 
cloud. Yet the mastax and its jaws of the normal form were still distinct, and the 
stomach and ovary were scarcely changed. I could not satisfactorily define a contractile 
vesicle, nor branchial tubes. The toes were turned up close to the belly. 
The lorica occurred in a tube sent me at the beginning of November 1885, by Mr. 
Bolton, of water from Blackroot Pool, near Birmingham, in which Asplancha priodonta 
had swarmed, all now dead.—P.H.G.] 
Length. To tips of toes, ;1, inch; of toes, +}, inch; width (and depth) of body, 
sro mech. Habitat. A pool near Birmingham (P.H.G.). 
VOL. 1. F 
