C. F. ROUSSELET ON PRESERVING ROTATORIA. 



13 



are also well preserved when weak osmic acid is used as the 

 fixing agent, except perhaps when the eyes are only faint patches 

 of red pigment, which then may disappear more or less in time. 

 So far I have prepared and possess slides of 130 different 

 species of Rotifers, including some of all the families, which 

 is sufficient proof that this " unpreparabie " group, as Mr. 

 Bolles Lee has styled the Rotifers, is now fairly conquered. It 

 is my intention to prepare a similar series for the cabinet of 

 our Club, to form in time a complete type collection, if possible, 

 of all the known Rotatoria, and I trust the members will assist, 

 in this task. This will prevent in future the confusion which 

 exists with regard to a number of species which have been 

 described three or four times under as many different names.* 

 As a beginning, I have much pleasure in presenting to the Club 

 77 slides, which will form the nucleus of this collection; they 

 contain 72 different species, of which the following is a list . — 



Stephanoceros eich- 



hornii. 

 Melicerta ringens. 



„ tubicolaria. 



,, conifer a. 

 Limnias annulatus. 



„ myriophylli. 

 Conochilus volvox. 

 (Ecistes stygis. 

 Asplanchna priodonta. 



„ amphora. 

 Asplanchnopus myrme 



leo. 

 Synchata tremula. 



„ tavina. 



„ stylata. 

 Triarthra longiseta. 



,, mystacina. 



,, breviseta. 



Hydat na senta. 

 Phinops ritrea. 

 Phinops (?) orbiculodis- 



cus. 

 Notops brachionus. 



„ pygmceus. 

 Triphylus lacustris. 

 Notommata lacinulata. 



Notommata aurita. 

 „ tripus. 



„ cyrtopus. 



Cyrtonia tuba. 

 Proales decipiens. 



„ parasita, in 

 volvox. 

 Furcirfaria Longiseta. 

 Diglena forcipata. 

 Ploesoma lynceus. 



„ Hudsoni. 

 Anapus ovalis. 

 Mastigocerca bicornis. 

 ,, carinata. 



,, bicrisiata. 



Rattulus sejunctijpes. 

 Coelopus porcellus. 



„ brachiurus. 

 Dinocharis tetractis. 

 Stephanops longispi- 



natus. 

 Stephanops intermedins. 

 Diaschiza semiaperta. 



„ exigua. 



Salpina brevispina. 



„ marina. 

 Euchlanis triquetra. 



Euchlanis 



„ parva. 



„ deflexa. 



,, pyriformis. 



„ Lyra. 



Cathypna ungulata. 

 Monostyla cornuta. 

 Distyla spinifera. 

 Metopedia solidus. 



„ acuminata. 



„ lepadella. 

 Pompholyx sulcata. 

 Brachionus pala. 



„ urceolaris. 



Noteus quadricornis. 

 Schizocerca diversicor- 



nis. 

 Anurcea aculeata. var. 



valga. 

 Anuraa cochlearis. 



,, serrulata. 



„ hypdasma. 

 Notholca acuminata. 



„ scapha. 

 Pedalion mirum. 



* Members who do not wish to mount the specimen themselves can 

 assist in this work by sending me living examples of rare species of Eotifers 

 when they happen to find them. The above list may be taken as an indi- 

 cation of what is not required, but the following species are particularly 

 wanted: — Apsilus lenliformis, Cephalosiphon limnias, Asplanchna Ebbes- 

 bornii, Microcodon clavics, Pedet.es sallator, Ptercessa surda, Scaridium 

 eudactylotum, Dinocharis Collinsii, Stephanops chlana and unisetatus, 

 Erethmia tetrathrix, Notogonia Ehrenbergii, and many others. 



