58 BULLETIN OF THE LABORATORIES 



bears several elongated setae. The maxtax is oval and seems to be 

 but slightly armed. It is furnished, however, with distinct annular 

 bands of muscles. The eye is cervical, and is seated on the under 

 side of a considerable ganglion. The foot is multiarticulate at the 

 base, as in Brachionus. Two distinct joints follow this portion, the 

 last being longer and bearing two oval, appressed spines. Of the 

 internal organs little was seen. The stomach is glandular and the 

 egg of but moderate size. The vascular system was not seen. 



Length, .24 mm., height, .15 mm., width, ,10 mm. Frontal pro- 

 cesses, .03 mm., spines of foot, .025 mm,, last joint, .02 mm. 



GENUS ANURIA, Ehr. 



Closely related to N'oteus and Brachionus is a genus of curious rotifers in 

 which the foot is entirely absent ,so far, at least, as can be seen. As in Brachio- 

 nus, the anterior opening is protected by spines or teeth, while there may or may 

 not be simtlar teeth behind. The lorica is usually distinctly separable into a 

 dorsal and ventral shield, and the dorsal scutum is marked off into geometrical 

 figures by raised lines. There is a single cervical eye. Tbe egg very generally 

 remains attached to the body and may be mistaken for a part of it. 



Anur.^a SP. 



A species differing from all European forms is very common in the 

 West. The form is hexagonal in outline, the length being 1.4 times 

 the width (exclusive of spines). The anterior margin of the hexagon 

 is wider than the posterior. The dorsal scutum is produced into six 

 long spiny teeth, of which the middle pair are much the longest and 

 are strongly curved outwards and downwards. The remaining pairs 

 are sub-equal and project outwards like the horns of an altar. The 

 ventral part of the anterior margin is excavated in the middle and 

 bears a series of small sharp teeth. The whole shell is ornamented 

 with circular prominences, and, in addition to this, above there are 

 strongly raised lines blocking off the shell into thirteen regular areas 

 and leaving two other areas about the front. The character of these 

 ridges is best seen from a side view. The eye is cervical and the 

 trochal cilia are strong for the genus. There is also a sensory tube. 



The following measurements, owing to an accident, may not be 

 accurate, but will give the propgrtioiis ; Length, . i rnm. , width, .054 

 mm.; longest spine, .024 mm. 



