OF THE EUCHLANIDOTA. 



693 



Distemnut, according to the number and disposition of their red points, and 

 without consideration of the characters we employ. 



Plagiognatha Felis. — The species 

 we reo:ard as the t}^e of this genus is 

 the P. Felis, called by Miiller Vorticella 

 Felis, but not answerable to the Notam- 

 mata Felis of Ehrenberg. Its two styles 

 are one-fourth of its entire length, and 

 are curved backwards ; the back is con- 

 vex, abruptly trimcate behind. 1-118". 



Pl. lacinulata has been classed by 

 Ehrenberg among the Notommatce. A 

 variety of this species with two eye- 

 specks may be referred to the Distermna 

 setigera (Ehr.). 



One must also regard as distinct spe- 

 cies oi Plagiognatha the Notommata Tigris 

 and the Diglena catellina of Ehrenberg. 

 The Diglena lacustris of the same author 

 also corresponds in form; but its jaws 

 are not suiRciently described to deter- 

 mine its position ; whilst his Notommata 

 kyptopus, represented with one-toothed 

 jaws, analogous to those of om* Furcu- 

 laria, appears the same as a Systolide 

 known to us, evidently possessing the 

 jaws of a Plagiognatha. 



Genus LINDIA (Duj.) (XXXIX. 1-3).— Body oblong, almost vermicular, 

 articulated by means of shallow transverse folds, rounded in front ; protrudes, 

 when swimming, two smaU. clavate organs (3n), clothed with radiating cilia 

 at their extremities, and forming a retractile rotary organ on each side. 

 Jaws (fig. 2) composed of thi'ee pincer-hke teeth. Eye-speck single, in front 

 of a blackish calcareous (?) sac. Two short conical toes at the posterior 

 extremity. 



LiNDiA tonilosa (Duj.). — Body red- 

 dish. Length 1-6'", Perty; 1-7"', Du- 

 jardin ; 1-8'", Cohn. Cohn, whose 

 amended characters of the genus we 

 have given above, thinks that Notom- 

 mata roseola may be identical with this 

 species: the latter diifers from Notom- 

 mata tardigrada, which it much re- 

 sembles, in the presence of the club-like 



rotary organ. Our author also contends, 

 in opposition to Dujardin, that the ceso- 

 phagus is ciliated. It is not, however, 

 quite certain that they refer to the same 

 animal. It is distinct from Notommata 

 vermicidaris, which it resembles. Cohn 

 thinks the genus Lindia should be located 

 amongst Philodinsea, 



FAMILY OE THE ALBEBTIJ^A (ALBEBTIENS). 



Body cylindrical, vermiform, round in front, with an obKque opening, from 

 which a ciHated organ protnides itself, almost larger than the body ; termi- 

 nated posteriorly by a short conical tail. Jaws in the form of hooks, simple, 

 or with one tooth each. 



This family comprises but one genus, and one species, Albertia vermicidaris 

 (XXXYIII. 35, 36), which is found parasitic in the intestine of Lumhrici 

 and snails. 1-79" to 1-47"* 



The ova with their embryos are seen in its interior, in various stages of 

 development. 



The ciliated apparatus, in advance of the mouth, is surrounded by an 

 appendage in the shape of a spur (calcar). 



FAMILY YI.— EUCHLANIDOTA. 



This family comprehends such Eotatoria as have a compoimd rotary organ 

 with more than two subdivisions, and whose bodies are enclosed in a hardened 

 lorica. The latter is very variable in form. Ehrenberg has remarked that it 

 sometimes resembles the hard carapaces of tortoises, at others the shells of 

 crabs. In the former case the lorica is open at the extremities ; and in the 

 latter, Ehrenberg supposed it to be open inferiorly in Euchlanis ; but this is 



