C. F. ROUSSELET ON THREE NEW SPECIES OF ROTIFERA. 163 



chief characteristic of the latter, as I have stated in a previous 

 communication, is a tubular prolongation of the lorica round 

 the foo' -opening, forming a distinct chitinous sheath through 

 which the foot passes. Nothing of this kind is present in 

 B. satanicusy which really forms a new type in this genus. 



The foot is long, stout and wrinkled, ending in two small toes. 

 The lorica is of glassy transparency, though there is a faint 

 indication of stippling on the posterior spines. 



An eye has not been observed in the preserved specimen^ 

 but is no doubt present, and its jaws and general anatomy 

 appear not to differ from other members of the genus, though the 

 corona may possibly vary on account of its small size. 



The total size of B. satanicus is 380yu, (^^ i^-)> ^^^^ ^^ which 

 is due to the large posterior spines. 



Mr. F. K. Dixon-Nuttall has been good enough to draw Fig. 2 

 for me. 



3. Brachionus havanaensis sp. nov. (PI. 7, Fig. 3). 



Some fourteen years ago Mr. A. Hempel sent me some plankton 

 material collected by him in the Illinois Kiver, near Havana, 

 U.S.A. In this material I found, amongst other species, two 

 empty lorica of this small and strange Brachionus-like Kotifer. 

 Mr. F. E. Dixon-Nuttall made the sketch Fig. 3 at the 

 time, which I have kept by me in the hope of being able to 

 ascertain more about it, but so far it has not occurred again 

 anywhere. 



The lorica is firm and smooth, high in the back, and of usual 

 Brachionus type, though differing from any known species in the 

 frontal and posterior appendages. The anterior dorsal edge has 

 six sharply pointed spines, the outer pair being slightly larger 

 than the middle pair, whilst the intermediate pair are very short. 

 The mental edge, as shown in Fig. 3c, has two projections corre- 

 sponding to two strong ridges running backwards. 



Posteriorly the lorica terminates in two long spines, close 

 together, guarding the foot-opening, which are unequal in size^ 

 the spine on the right side being the longest. 



Of the animal itself nothing at all is known, and it is hoped 

 that the publication of these figures will assist in its being again 

 discovered. 



JouRN. Q. M. C, Series II, No. QS. 12 



