OF THE ENCHELIA. 



609 



larger and ciliated throughout. How- 

 ever, the reality of T. pura as a species 

 is very doubtful, — the small size of the 

 vacuoles, the feature most relied on by 

 Ehrenberg as distinctive, being in reality 

 not at all so, but prone to great varia- 

 tions, determined by surrounding cir- 

 cumstances. It swims slowly, revohdng 

 as it proceeds. 



T. Nasamomum. — Cylindrical, extre- 

 mities equall}^ obtuse, mouth large, and 

 elongated laterally. 1-288". 



T. omta. — Ovate, tm'gid, attenuated 

 anteriorly; mouth small and lateral. 

 1-480". 



T. (?) jEthio2nca. — Oblong, attenuated 

 posteriorly ; under side flat ; mouth 

 large. 1-600". 



T. Asiatica. — Oval, oblong, cylindrical, 

 roimded at both ends ; mouth small. 

 1-860". 



This species, together with the three 

 immediately preceding, must be regarded 

 as doubtful; for they were merely casually 

 examined by their discoverer whilst tra- 

 velling, and when, as we must suppose, 



he had neither the means of comparing 

 the beings with others akin to them, 

 nor very favourable opportunities, in the 

 rough accommodation of desert tra- 

 velling, for careful microscopic examina- 

 tion. 



T. Pyrum (Kolpoda Pyrum, M.). — 

 Ovate, tiu'gid, acute anteriorl}' . Amongst 

 Confervse on Mount Sinai. 1-1200". 



A species with this name is also men- 

 rioned by Dujardin {i& = KoIpoda Pyrum ? 

 (Miiller). It is thus described : — " Body 

 ovoid, oblong, narrowed anteriorly, or 

 pja'iform ; thicker in one direction than 

 in the other;" and he goes on to say 

 that this is the same being as the Leu- 

 cophrys carnium (Ehr.). 



T. anyulata (Duj.). — Oblong, obliquely 

 and regularly plaited or angular, often 

 with one or more superficial vacuoles. 

 1-900". 



T. Lynceus. — The animalcule described 

 under this name is (sa^'s Cienkowsky) 

 probably no other than the young phase 

 of various Oxytriclice and StylonycMce 

 (Siebold, Zeitsch. 1855, vol. vi. p. 301). 



Genus LACRYMAMA (XXIV. 274, 275).— Body with a long narrow 

 neck, slightly enlarged near the termination, where is situated the ciliated and 

 lateral (lipped) mouth, destitute of teeth. Body not ciliated. Locomotion is 

 performed by means of the neck, the distensible body, and the oral cilia. The 

 proboscis-like lip is very short, sometimes distinctly articulated, and projects 

 but little beyond the oral orifice. Coloured food is received by L. Proteus, 

 and its discharge may be seen to take place from the posterior extremity in 

 one species ; in another, green granules (ova) are present. 



The genus Lacrymaria of Dujardin agrees mainly with that just defined ; 

 but the French author differs entirely from Ehrenberg, by stating that the 

 Lacrymarice are distinctly ciliated on their surface, and that the cilia are 

 disposed in regular series among the reticulations of the integument. 



Dujardin, in his notes on Lacrymaria, has some very just obsei'vations on 

 the relation between this genus and the Phialina and TracJielocerca (Ehr.). 

 He says, the species of Lacrymaria, which Ehrenberg noticed to be generally 

 not ciliated on the body, have been classed by him according to the relative 

 position of the mouth and anus, — some among theEnchelia, others, as Phialina, 

 among the Trachelia, and others again in the genus Trachelocerca, the type 

 of his family Ophryocercina. On this plan, Lacrymaria has the body without 

 cilia, prolonged into a narrow neck, terminated by an obliquely tiimcate and 

 ciliated mouth, at the opposite extremity to which is the anus ; Phialina 

 similar, except that the neck, instead of being terminated by a simple enlarge- 

 ment, is notched on one side, and the mouth therefore lateral ; and Trache- 

 locerca, which he himself caUs " tailed Lacymarice,'' have a terminal mouth, 

 and an anus on one side in advance of a conical caudiform prolongation of the 

 body. These distinctions are not borne out by more critical investigations, 

 and at most are insufficient to establish generic characters, and still more 

 those of higher groups or families. As the result of these considerations, 

 Dujardin has comprehended all the species distributed in the three genera 

 named in one, \dz. Lacrymaria, which he places among the Paramecina. 



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