670 Proceedings of the Royal Irish Academy. 



P. acideata, Ehrenb. This very similar and equally rare species was 

 found to be fairly common in marshes among vegetable debris, 

 1889, '94. Miss Glascott enumerates four out of the above five 

 species of Philodina, omitting P. tuber culata, but adding P. 

 megalotrocha, Ehrenb. 



Rotifer tardus, Ehrenb. Numbers of this handsome species occurred 

 in a bog-pool 2^ miles east of "Westportin 1891, and a few were 

 re-discovered in 1894. 



R. vulgaris, Schrank. Common around Westport. 



R. mento, Anderson, Notes on Indian Rotifers, Journ. Asiat. Society, 

 Bengal, 1889; Journ. Quekett Club, 1893, p. 276; Jennings, 

 Rotat. of the great lakes of Michigan, Bull. Michig. Eish Comm. 

 No. 3, 1894, p. 6. This species was first discovered near 

 Calcutta. Though rare it seems to be widely distributed, and 

 when met with it invaa'iably occurs in large numbers. Mr. H. 

 S. Jennings found it in great abundance in 1893, in the swampy 

 shores of Lake St. Clair, Michigan. I also found it in thousands 

 in a ditch in Eifeshire in March, 1894; and again on the 2nd 

 August, 1894, in abundance in a marsh two miles from Westport. 

 It is a social species. Unlike any other species of the genus, 

 the animal inhabits a long, narrow, gelatinous tube, of a brownish 

 colour, and open at both ends ; a large number of these tubes 

 are packed closely together, and scores of the animals may be 

 seen projecting from their tubes, with their wheels all spinning 

 round, in the field of a 1-inch objective. The animal when 

 disturbed leaves its lodging, and swims swiftly through the 

 water ; and if industriously watched, it may be observed to 

 again occupy an empty tube. 



R. macrurus, Schrank. I found a number of specimens of this, the 

 handsomest member of the whole family Philodinidse, associated 

 with the preceding species, in 1894. 



R. macroceros, Gosse. I met with this species frequently in Knappagh 

 lakes in 1892-94, nestling in the axils of the leaves of Myriophyl- 

 lum. 

 In addition to three of the above five species of Rotifer, Miss 



Glascott further mentions R. hapticus, Gosse, and R. phaleratus, n.sp., 



which latter is, as the writer says, "probably only a variety of R. 



vulgaris. ^^ 



Callidina elegans, Ehrenb. A few specimens in an old quarry, to the 

 north of Westport, 1892, '94. 



