Hood — On the Rotifera of the County Mayo. 695 



from living examples sent him by me. Many examples of this 

 species were captured in a tide-pool near Louisburgh, Clew Bay, 

 1889 ; and again a large number were taken from the lagoon and 

 other tide-pools at Westport Harbour, 1891, '92. 



N. thalassia, Gosse. Mr. Gosse in his description of this species in 

 the Monograph has omitted to mention the antennae, of which, 

 like the preceding species, it is furnished with three. The occipital 

 one is very similar to that of N. spinifera ; it is quite as long, 

 but the sheath is narrower at the point. The dorso-lateral 

 antennae in the lumbar region are very minute. Many examples 

 occurred in the lagoon and other tide-pools about "Westport 

 Harbour, 1891, '92, 94. 



If. rugosa, Gosse. H. and G., SuppL, p. 56, pi. xxxi., 59. A large 

 number of this species occurred in a tide-pool at Louisburgh, 

 Clew Bay, 1889. 



N. heptodon^ Perty. H. and G., SuppL, p. 56, pi. xxxiv., 34. Anuraa 

 heptodon, Perty. This species is well distributed in the west 

 of Mayo. I found it sparingly in a number of lakes, and in the 

 quarry-pond near "Westport, 1889, '91, '92; also in the lake at 

 Castlebar, 1891, It was in the west of Ireland that I first met 

 with this species, although I have found it of late in Scotland 

 also. 



N. labis, Gosse. H. and G., SuppL, p. 57, pi. xxxi. 56. This is the 

 smallest species of the genus, and a very attractive one. It is 

 easy of identification, owing to its possession of a posterior 

 appendage to the dorsal plate, not unlike the handle of a pair of 

 bellows. It also possesses a prominent occipital antenna, similar 

 to that of N. spinifera. I am not positive as to the presence of 

 lumbar antennae. I found this species fairly numerous in the 

 quarry-pond at Westport in July, 1894, but in this spot only. 



N. hoodii, "Western. Journ. Quekett Club, v. 1893, pp. 155-60. A 

 few specimens of this marine species occurred in a pool filled at 

 high water near "Westport Harbour, Aug., 1893. 



Order SCIRTOPODA. 



Pamily Pedalionid^. 



Pedalion mirum, Hudson. This most remarkable Rotifer is rare, but 

 at the same time widely distributed. Since the summer of 

 1871, when Dr. Hudson discovered it near Clifton, it has been 

 found not only in many parts of Europe, but even in Africa and 



