Tracheliiia-I infusorial animalcules, 57 1 



the body generally and the long ones near the mouth. Coloured 

 food has demonstrated the polygastric structure of three species, and 

 in one has shown the point of expulsion. In Z. Bursaria propagating 

 apparatus of a double kind, viz., ova-granules, an oval gland, and 

 two contractile globular vesicles, have been seen, and in two others 

 the granules only ; self-division transverse. 



Dujardin's characters of Loxodes are, — " Body flat, membranous, or 

 with an apparent membranous lorica, flexible but not contractile, 

 expanded at the centre of its superior or dorsal surface; often con- 

 cave on the under surface; contour irregularly oval, sinuous and 

 obliquely prolonged anteriorly, furnished with very fine cilia confined 

 to its anterior margin." In general characters it approaches nearest 

 to Trachelius (family Trichodiens), but the signs of an integument are 

 so clear as to sever it from that genus and family. The Loxodes, 

 described by the French author, are almost aU of them distributed 

 by Ehrenberg among other genera and families, and hence there 

 unfortunately is but the slightest relation between the similarly 

 named genus of the two writers. Thus the Loxodes rostrum of 

 Ehrenberg, is the representative of a genus Pelecida, of the family 

 Trichodiens (see page 580), in the system of Dujardin, and bears the 

 name of Pelecida rostrum. In this position it is brought into close 

 relation with the genera Trichoda and Trachelitis, (Ehr.) and with 

 two others, named by Dujardin, Acineria and Bileptus. 



The last mentioned genus comprises Infusoria placed by Ehrenberg 

 with Amphileptus, in describing which we shaU take the opportunity 

 to give the characters of Dileptus, whilst Acineria and Pelecida wiU 

 be included among the appended genera at the end of the present 

 family Trachelia. 



Loxodes rostrum {Kolpoda rostrum, II. Pelecida rostrum D.) — Body 

 compressed, white, lanceolate, slightly ciu'ved in the form of an S, in 

 consequence of the Lip being a little uncinated. Ehrenberg states 

 that he has very often seen large Naviculce and Sijnedrce within this 

 creature, but that it would not feed on coloured food. The cilia are 

 very delicate. Fig. 291 represents an animalcule which has fed 

 upon BaciUaria ; fig. 292 another creeping along Conferva ; and fig. 

 293 a specimen undergoing transverse self-division. Found amongst 

 Conferva. Size 1- 144th to 1 -60th; ova granules less than 1 -24000th. 



p p 2 



