or THE CTCLIDINA. 



•3 



excellent observer also describes a con- 

 tractile vesicle and a discoid nucleus ; 

 the foiTuer is the clear space mistaken 

 bv Ehrenberg for a mouth. At the same 

 time he considers an oral aperture most 

 probably exists somewhere near the 

 middle of the organism, since he has 

 seen the entrance of solid particles into 

 the interior. Perty makes C. Glaucoma 

 svnon}Tnous also with Enchcdys tri(p(etra 

 (Ehr.), and probably with the Para- 

 mecium Milium and Cycliclium 3Iillum of 

 Miiller. In his system it is a member of 

 the family Tapinia, where it is conjoined 

 with some species of Leucojjhrt/s, with 

 Acomia (Duj.), and several newly- 

 cveated genera. 



C. marijaritaceum. — Orbicular, ellip- 

 tical ; the posterior end slightly excised ; 

 the dorsal surface with distinct longi- 

 tudinal lines ; cilia not distinct. 1-1500" 

 to 1-1000". 



This species is separated by Perty from 

 Glaucoma, and constitutes in his system 

 the representative of a genus he names 

 Cinetochilum, which, vnth. Glaucoma, 

 fonns the family Cinetochilina {vide 



Genus PANTOTRICHUM. 



Glaucoma). The Cin. marcjaritaceum is 

 characterized as a sliort elliptical animal, 

 rather compressed and with its vibratile 

 flap on the posterior half, colourless and 

 transparent. Movements quick; rota- 

 tion on its axis rare. Cilia very short. 

 Fission transverse. 1-810" to 1-720". 

 Lachmann {A. N. H. xix. 216) appears 

 to approve of the systematic position 

 assigned by Perty to this being. 



C. (P) planum. — Oblong-elliptic, 

 smooth ; cilia but little marked. l-2tJ40". 



C. (?) lentiforme. — Smaller than C. 

 planum, and has no distinct strice or cilia, 

 1-3180". 



C. Arhorum. — Small, suborbicular, 

 slightly excised laterally; dorsum ru- 

 gose ; margin ever^-where ciliated. Diam. 

 1-192"'. Marginal cilia used in the way 

 of feet ; swims rapidly. Fission trans- 

 verse. On moss of trees. 



This animalcule is identified by Cohn 

 (Siebold's Zeitsch. 1851, p. 273) \\ath the 

 embryo developed by Loxodes (Parame- 

 cium) Bursaria. If this be the case, it 

 must be rejected from the list of inde- 

 pendent species. 



Body turgid, covered with moveable cilia. In 



P. Enclielys gastric cells (vacuoles) are distinctly visible. Granules, green or 

 yellow, occupy the interior. Ehrenberg says, " The absence of a double ah- 

 mentary aperture is not yet proved; nor, on the other hand, is its existence." 

 Pantotiichum is not received by Perty as an independent genus, but is com- 

 prehended by him with Lagenella and Chcetoglena, under the common appel- 

 lation Clionemonas, and placed among the Thecamonadina. 

 Pantotrichum Enchelys. — Cylindri- ; Ovate, spherical, of a green coloiu:. In 



cal, oblong, roimded at both ends ; hya- 

 line at extremities and turbid, the centre- 

 colour pale yellow, x. 212 is a cluster 

 of animalcules ; those to the left are 

 more highly magnified than the others. 

 In swimming they revolve and glide 

 along in the direction of the longer axis 

 of the body. In infiLsions of raw flesh. 

 1-1150'. 

 P. vulvox {Zicucoplirya viridis, M.). — 



brackish water. 1-860' 



P. Lagenella. — Ovate, the ends equally 

 rounded, anterior ciliated portion pro- 

 duced in the form of a neck or beak. 

 Amongst Conferv?e. 1-1080" to 1-570". 



Schneider {A. N. H. 1854, p. 329) de- 

 scribes this species as forming around 

 itself a cyst, which completely retains 

 the flask-like form of the body, when the 

 animalcule enters on a state of rest. 



Genus CH^TOMOXAS. — Motion slow, and leaping by means of the bristles 

 on the body, which are not vibratile. Internal organization very little known. 

 They are parasites, living on the dead bodies of other Infusoria, and in infu- 

 sions of flesh or other animal matters. A vibration is seen at the mouth ; but 

 whether it is produced by a filament or by cilia, is uncertain. In C. con- 

 stricta, transverse self-division is thought to have been seen. 



Ch^^tomonas Glohdus. — Almost 

 spherical, of an ash-colour, furnished 

 with setse or bristles. It often has the 

 figure of Monas Guttula, but is larger; 

 sometimes two cluster too-ether. In 

 bad-smelling infusions of animal matter 

 along with Pantotrichum Enrhelys, Monas 



Termo, &c. ; also in the dead fi-onds of 

 Closterium acerosum, as shown at x. 113. 

 1-2880". 



C. constricta. — Transparent, oblong, 

 slightly constricted at the middle, and 

 ha^nng two set.ie or bristles. In dead 

 Hydatina senfa. 1-5760". 



