227 



p. 93). Mr. Keeley's letter referred to a balsam-mounted slide 

 from Prof. Amici to 0. A. Spencer labelled " Navicida 

 Amicii, Florence, Italy." It is a mixed fresh-water gathering, 

 containing a large proportion of typical Navicula rhomboides, 

 among which are a few valves under 50 fx in length, which form 

 a class by themselves, on account of extreme delicacy and 

 transparency, which in the balsam mount renders all but the 

 midrib nearly invisible. On account of this delicacy they are 

 much more difficult to resolve than would be anticipated from 

 the distancing of the markings. 



In a covering note Mr. Nelson discussed the measurements 

 given, and showed that the much-discussed Amician test is 

 certainly the English rhomboides. 



Mr. C. F. Kousselet, F.R.M.S., described "Three New Species 

 of Rotifera." The first was Anurcteopsis navicida, obtained from 

 material collected in 1904-5 by Prof. A. Borgert at Lake- 

 Gregory, in Central Ceylon, at an altitude of about 6,000 ft.. 

 The size of the lorica is 92 // only. It is, therefore, one of the- 

 smallest species of Rotifera. In naming the second new species, 

 Bi'achionus satanicits, Mr. Rousselet said that the difficulty of" 

 finding new and suitable names for new species of Rotifera is 

 becoming more and more acute, and he thought this name might 

 be excused, and that it was not inappropriate for a Brachionus 

 which inhabits the Devil's Lake in North Dakota, U.S.A 

 Brachionus havanaensis is described from material collected some 

 fourteen years ago by Mr. A. Hempel from the Illinois River, 

 near Havana. Only two empty loricas were found ; total length, 

 including anterior and posterior spines, 282 ^. 



The President, in proposing the thanks of the meeting to 

 Mr. Rousselet for his paper, remarked that it was very interest- 

 ing to have these descriptions of new species, and he thought the 

 Club was very fortunate in having amongst its members an 

 expert so capable of describing them. 



Preparations under microscopes and drawings of all three 

 species were exhibitedc 



Mr. R. T. Lewis read a note " On the Larva of Mantispa," 

 in which, after comparing the families of Mantidae and 

 Mantispidae and illustrating his remarks by reference to a 

 coloured diagram, he described the differences between the two 

 in the course of their development, and gave an account of the 



JouRN. Q. M. C, Series II. No. Q^. 16 



