HYDATINADA. 11 
as an organ of touch. The inner ciliary wreath consists of larger cilia which are some- 
times held erect. The esophagus is long and narrow, and the gastric glands so irre- 
gularly conical, that they generally appear unlike ; probably owing to their being seldom 
presented to the eye from similar points of view. The nervous ganglion has an unusual 
position. It lies near the end of the proboscis, and gives off, above, four parallel nerve- 
threads; the two outer of which pass to the eyes, and the two inner to the sensitive 
bare spot on the tip of the proboscis (fig. 2c). The rest of the internal structure is 
both obvious and normal. The young animal quits the egg while yet in the body of 
the parent, and may often be seen filling up a large portion of the body-cavity. The 
ephippial eggs closely resemble those of Conochilus volvoc. 
Rhinops vitrea usually swims at a moderate pace, rolling gently round its longer 
axis as it goes, and every now and then bending back its proboscis, or turning somersaults 
as Syncheta pectinata does, only in a much more leisurely manner. Occasionally it 
darts forward ; and, at each time that it has done so, I fancied I could see the atom 
which it wished to secure. Then it glides over the stems of Alg@, using its long pro- 
boscis just as Adineta vaga does its ciliated face; and, when a larger atom than usual 
has been drawn into the coronal cavity, it compresses the broad flaps of the corona, 
and rounds the whole front of the body into a long ciliated tube.! 
Length, J, inch. Habitat. Clifton (C.T.H.): not common. 
2 30 \ 

Genus NOTOPS, Hudson. 
GEN. CH. Body not conical ; foot long and symmetrically placed with respect to 
the trunk, or short and wholly retractile within the ventral surface ; eye single, occi- 
rtal. 
Of the three remarkable species contained in this genus, two, N. Brachionus and 
N. clavulatus, are strikingly alike each other, especially in the head and its ciliated 
protuberances, and also in the trophi. They are, however, curiously unlike in their 
outline, and in the relative length of the foot. The third species, N. hyptopus, resembles 
N. clavulatus in the short foot, and in the odd position in which it is placed ; but differs 
widely from all the Hydatinade in the corona and trophi. Feeble, however, as are its 
affinities with the two other species of the genus, they are stronger than those it has 
with any other ; so it has been placed here as the best makeshift that could be devised. 
N. pracuionus, Ehrenberg. 
(Pl. XV. fig. 1.) 
Notemmata brachionus . z é Ehrenberg, Die Infus. 1838, p. 433, Taf. 1. fig. 3. 
Leydig, Ueb. d. Bau d. Rdderth., 1854, p. 99. 
Hudson, Mon. Micr. J. vol. xiii. 1875, p. 46, pl. xci. figs. 1-4. 
” 
” 
SP. CH. Trunk square; foot one-third of total length, placed in continuation of 
the body’s longer axis, not wholly retractile; trophi malleate. 
I found this handsome creature in a small rain-pool in Leigh woods. The summer 
heat frequently dried the pool up, but a heavy shower or two soon filled it again; and, 
two or three days after the downfall, I always found N. brachionus there in abundance : 
no doubt hatched out from eggs deposited on the rotting leaves which formed the 
bottom of the pool. These strange habitats of the Rotifera are probably due to their 
eggs being wafted by winds, or carried by birds; so that it is no wonder that this species 
should haye been captured by Schmarda in a spring near the top of Adam’s Peak in 
’ Dr. Plate (Joc. cit.) says that R. vitrea has but one toe. I thought so myself, till I saw the 
creature, of its own accord, separate the apparently single toe, into two. 
