ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 



187 



Fig. 28. 



wliicli lie found living in Ascidians. He also gives a further account 

 of Notopterophorus papilio and N. hombyx (see Fig. 28), remarkable 

 forms in which the body is provided with 

 large delicate membraneous lamellae, not 

 unlike wings of Lepidoptera. The head 

 has a kind of covering which is sur- 

 mounted by two narrow expansions, longer 

 in the female than in the male, and not 

 found in the young. The wing-like expan- 

 sions are attached to the dorsal portion of 

 the thorax ; they are evidently too delicate 

 for any marked action, and it is probable 

 that they are able to insinuate themselves 

 between the tisues of their host ; they can 

 move with some rapidity, after the fashion 

 of a butterfly's wings. When young, these 

 curious creatures resemble a Monoculus in 

 form. A systematic definition of the two 

 species is appended, and reference for 

 further details is made to the author's 

 earlier papers (1864 and 1865.) 



New Britisli Cladocera from Grasmere 

 Lake.* — Professor Eay Lankester points 

 out that previous to his identification of 

 Leptodora Jiyalina Lillj., and Hyalodaphnia 

 Kahlhergensis Schodl, as British Cladocera 

 in specimens from the Olton reservoir, few of the remarkable 

 forms of Cladocera which occur in the larger lakes of the Continent, 

 had been recognized as occurring in this country; but the list has 

 now been extended by the observations of Mr. C. Beck, who, last 

 summer, examined the Entomostracous fauna of Grasmere Lake, 

 Westmoreland, and found the following species, three of which are 

 new to British waters. 



1. Leptodora Jiyalina Lilljeb. $ . Taken Sept. 16th. 



2. Hyalodaphnia Kahlhergensis Schodl. Abundant Sept. 9th to 



16th. 



3. Holopedium gihherum Zaddach. Thirty specimens, each en- 



cased in a gelatinous globe, Sept. 7th to 16th. 



4. Latona setifera $ and $ Straus (Weissman). Sept. 3rd to Idth. 



5. Bythotrephes sp. Sept. 14th. This appears to be a new species, 

 distinct from the Bythotrephes longimanus of Leydig. 



At the same time, Mr. Beck observed the following, already 

 known to Baird as British species, but some being of rare occurrence : 

 Sida crystallina 0. F. Miiller (Straus genus) ; Daphnia vetula Miiller, 

 D. reticulata Jurine ; Eurycercus lamellatus 0. F. Miiller (Baird 

 genus) ; Alona quadrangularis Miiller (Baird genus) ; and Peracantha 

 truncata Miiller (Baird genus). 



It appears probable that in lakes where species of the Salmonid 



* Ann. and Mag. Nat. Hist., ix. (1882) p. 53. 



