Enchelia.'\ infusoeial animalcules. 559 



tacles capitate ov knobbed at the end, not so nuraerons as in the first 

 species, and placed in a single row round a narrow disc. Parasitic on 

 Sertularia. 



Alderia pijriformis. — "Body pear-shaped, or perhaps rather bell- 

 shaped, with a distinct rim round the top, and a single circle of delicate 

 capitate feelers (tentaciila), which, as in the former instance, were 

 retractile. Stem long and slender. Parasitic on Paludicella, and, 

 unlike the preceding, inhabiting fresh water. 



Mr. Alder's first impression, regarding these creatures, was, that 

 they were new forms of Campanularian Zoophytes (?'. e., of Polypes.) 

 A more careful examination, however, convinced him that their 

 organization was much more simple than is to be fovmd in the true 

 Polypes, and that they must be considered to belong to the class 

 Infusoria. Their relation to the Vorticell(^ is remote, and they come 

 nearest to Aeineta. The Aeineta mystacina (Eh.) somewhat resembles 

 the last species, but its form appears much more simple, and the 

 tentacles rise irregularly from different parts of the body. These 

 animalcules are of interest, as forming a more perfect link between 

 the Infusoria and the Campanularian Zoophytes, than any hitherto 

 known. "We ourselves feel more disposed to range this genus in the 

 family Vorticellina, than with Aeineta. 



Genus Trichoda. The hair Animalcules. — Body (?) devoid of 

 hairs or cilia ; mouth truncated (oblique), destitute of teeth, but 

 provided with vibratile cilia, and a lip, but no neck. The polygas- 

 tric apparatus is satisfactorily proved by the employment of colom-ed 

 food, and the posterior anal spot is also known. The oblique direc- 

 tion of the mouth gives rise to a very characteristic upper lip-Kke 

 projection. In T. 'pyrum only has self-division been observed. All 

 the species are coloiu'less. 



T.2mra {Kolpoda pyrum, M. figs. 271, 272, 273.) — Body oblong, 

 club-shaped, with small vesicles. The anterior part attenuated, and 

 the mouth lateral. Common in vegetable infusions ; usually with 

 Cyclidium glaucoma. Size 1 -720th. 



T. Nasamonum. — Body cylindrical, extremities equally obtuse, 

 mouth large, and elongated laterally. Size 1 -288th. 



T. ovata. — Body ovate, turgid, attenuated anteriorly ; mouth small 

 and lateral. Size 1- 480th 



