ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
639 
Rotifers are taken into consideration, such as the Asplanchnidae, where 
the large contractile vesicle has obviously no connection whatever with 
the blind digestive tract. 
Dr. Janson has been so fortunate as to discover for the first time some 
winter eggs in several species of Callidina, and as these so-called winter 
eggs in other rotifers have been proved to be the result of fecundation, 
it becomes probable that a male exists, although no male Philodina has 
yet been found. 
The question of how the mature young and eggs leave the parent 
in the apparent absence of a uterus and oviduct is left much as it stood 
before. The young of viviparous Philodinidse lie freely in the body- 
cavity of the parent, and break forcibly either through the wall of the 
cloaca or through the body-wall, generally at a point near the cloaca — an 
operation which generally causes the death of the mother. Three such 
acts have been seen by the author. The extrusion of an egg has not 
yet been witnessed by any observer, and it is still a mystery how it 
leaves the body-cavity of the parent, in which it appears to lie freely. 
Here is an interesting point left for future observers. 
Euchlanis bicarinata Perty.— Mr. F. R. Dixon-Nuttall contributes 
the following note: — “ I found this rotifer on 7th April, 1893, in some 
water sent to me by Mr. J. Hood, of 
Dundee. This rotifer is described as a 
Euchlanis , in Hudson and Gosse’s ‘ Sup- 
plement to the Rotifera,’ p. 40, pi. xxxiii. 
fig. 31, but it is undoubtedly a Salpina, as 
the lorica is a true form of that species ; 
that is, all of one piece, and split on the 
dorsal surface. The lorica viewed from 
the posterior, fig. 89, A may be called four- 
cornered ; there is a keel-like ridge on 
the ventral surface. It has the power, like 
most Salpinse, to cause the dorsal split to 
gape or almost close up, though the normal 
size of the cavity is as shown in fig. 89 A 
One of the most striking points of this 
animal is the length of the lower joint of 
the foot, which is of itself about one-third 
the length of the lorica. The descrip- 
tion given, as above mentioned, speaks of a 
short joint at the base of the two toes. 
There is no such joint, the toes come 
direct from the base of the “long joint.’’ 
There is what might be called a “ cup-and-ball ” joint, where this long 
portion of the foot joins that part nearest the body. The toes are 
blade-shaped, and a little longer than half the length of the long joint 
of foot. The eye is elongated, and rests on the under part of the 
brain close to the mastax. There is a dorsal antenna, as seen in fig. 90* 
Though this little animal is exceedingly restless, gliding quickly over 
anything it comes to, bounding first to one side and then to another, 
it is a very slow free swimmer. The length of the lorica is 1/100 to 
1/95 in. ' 
Fig. 89. a 
