796 Mn. c. F. noussELKT ox [May 24, 



constriction beliiiid the great frontal lolies, is gloltose iij sliape, 

 liigh and rounduil dorsally, contracting sharply postero-ventrally 

 for the issue of a short tul)ular foot, apparently one-jointed, and 

 carrying two fairly thick toes. The integument is firm but not 

 hardened into a lorica. Two red frontal eyes are present, wide 

 a})art, and situated near the middle of the lateral lol)es. 



The jaw's are shown in fig. ."5 ; I must .state, however, that, 

 owing to a granular depo.sit below tiie integument, which 1 was 

 unable to clear or dissolve with potassium hydrate, this figure 

 must be taken as only approximately correct. I have unfortiuiately 

 been unable to obtain a clear view of the various parts, but the 

 iigure repi'esents as much as I have been able, though imperfectly, 

 to make out of the structure. The rami are broad triangular 

 plates resting on a long straight fulcrum, which appears to be 

 surrounded by a coarsely striated muscle ; the mallei consist of an 

 inicus with four teeth of which the anterior tooth is the largest 

 and curved, and a narrow manubrium directed outward. 



The very imperfect state of pi-e.servation of the specimen did not 

 enable me to make any observations regarding the internal organs, 

 the stomach, intestine, ovary, glands, muscles, itc, being wholly 

 dis.solved into a granular mass. A short tabular dorsal antenna, 

 however, is distinct on the dorsal side behind the midiUe of the 

 bead.* 



T'otal length, including foot, 204^/ (y^ in.). 



Widest part, across frontal lt)bes, lU8/i (77^3 in.). 



Lake Xyasa. 



A considerable number of Plankton collections were made in 

 this lake in June 19U4, and I examined many tubes full of fine 

 Alga' and Diatoms ; but only in two of these, from Monkey J-iay 

 and Anchorage Bay, situated at the southern end of the lake, 

 could 1 find a very few Rotifera, six in all, as follows: — 



Rotif era found in Lake Xyasa. 



Dlarella stylata Eyfert. 

 Jiattuhis st;/latus (iosse. 

 /Jrac/tioiias pala var. ilorcns Go.sse. 



,, ))iil!t((ris Ehrenbg. 



Xotholca lab is (Josse. 

 Aniira'a aculeata var, valga Ehienbg. 



ii'tl cvijs situiiti'tl vt>ry wiilc apart <iii tin' ciliarv lolics ; otliiTwiM- tlic ^ri'iicriil nIihjw 

 ol till- animal is wi-ll ii'incsfiitccl on I'latc LXW. No iloulit Mr. Ilaniii-j will 

 ymlilisli liis «ii!i\viii;^s anil (IcM'i-iiition nf tlii.-< vciv st.anjie nniiiial whiili will 

 .Titiiinly ii'i|niri' a luw L'unus, it not a nfw family, to icci-ivi' it. 



