64 
BULLETIN OF THE LABORATORIES 
what Ehrenberg has called Brachionus ampiceros. Hudson and Gosse 
consider this to be a variety of B. pala. 
Sp. 23. Brachionus urccolaris, Ehrenberg. 
Brachiomus urceolaris, Hudson and Gosse, The Rotif- 
era, or Wheel-animalcules, Vol. II, p. 118; pi. XXVII, fig. 6. 
It is not easy to decide whether the species here described is B. 
wceolaris or B. rubens. After some hesitation I have considered it to 
be the former. I append a description : 
Lorica sub-quadrangular, longer than broad. Cephalo-dorsad 
margin of the lorica bearing six straight teeth Lateral teeth largest, 
Middle pair next in size. None of the teeth very large, the lateral 
teeth, however, are relatively larger than the corresponding teeth of 
the British species. Between the middle teeth there is a shallow, con- 
cave, depression. From the base of the tooth to the bottom of this 
depression is about as long as the height of the tooth. ('ephalo \'en- 
trad margin of the lorica slightly elevated and indented at the meson. 
Laterad margin of lorica straight, caudad margin convex. No caudal 
spines. A sub-square orifice in the middle of the caudo- ventrad mar- 
gin of the lorica serves for the exit of the very flexible, wrinkled, 
foot. This orifice is bordered by two lateral papillae. 
This species is often encountered in ponds containing plant life. 
Either this or a closely allied species is often found attached to the 
lorica of Moina paradoxa, Weismann. 
Sp. 24. Brachionus halccri, Ehrenberg. 
[Plate I; Figs. 1-3.] 
Brachionus bakeri, Hudson and Gosse. The Rotifera, 
or Wheel-animalcules; Vol. II, p. 120; pi. XXVH. fig. 8. 
Brachionus bakeri, '='■ C. L. Herrick, Bull. Sci, Lab. of 
Denison Univ., Vol, I, p. 55. 
This is the commonest of our Brachionidae and it is- subject to 
great variations, not only in appearance but also in size. Some varie- 
ties appear to be fully one-third again as large as others. 
The markings upon the loriea vary in different individuals. In 
some cases the lorica is smooth, while in others it is more or less 
facetted and granulated. 
The shape of the depression between the middle teeth of the 
cephalo-dorsad margin of the lorica also varies. In some individuals 
this depression is acute, while in others it is strongly convex. 
