with descriptions of new Genera and Species. 199 



Family HydatinjEA. 



Gen. Taphrocampa. (rd(f)po<i, a ditch, and /cd/uTTT], a cater- 

 pillar.) Rotatory organs wanting, body fusiform, annulose ; tail 

 forked : gizzard oval; mallei incurved, shorter than incus, which 

 is also incurved *. 



T. annulosa. Occipital mass opake, white ; alimentary canal 

 simple, wide, cylindrical : points of tail short, conical. Length 

 yy<jth inch. This species is evidently allied to M. Dujardin's 

 Lindia torulosa (Hist. Nat. des Infusoires, p. 653), but differs 

 from it in the structure of the dental apparatus, and of the 

 digestive canal. It seems to connect the genus Chatonotus with 

 the Hydatinseous genera Notommata and Furcularia, for it has the 

 jaws of these larviform Rotifera, and the glandular occipital mass 

 found in some of them, with the form, simple digestive canal, 

 and manners of Chatonotus. It was found at Leamington. 



Hydatina senta (?). 



Pleurotrocha gibba. 



P. truncata. Body subcylindrical ; truncate behind, above 

 the foot : toes short, straight, slender. Length T |jth inch. 



Furcularia gibba. 



F. ca>ca. Body cylindrical : eye wanting, or not discernible : 

 toes slender, obtuse. Length, including toes, y^jth inch. Lea- 

 mington. 



F. forficula. 



F. gracilis. 



Monocerca rattus. 



M. brachyura. Form that of M. rattus, but the foot short 

 (one-fourth of total length), slightly curved, and horizontally 

 flattened : a large eye in the occiput, and another small one in 

 the breast. Length, including foot, y^jth inch. 



M. porcellus. Body thick and plump ; foot short, much 

 curved and bent under the body, dilated, flattened horizontally, 

 and carrying a smaller spine beneath it as in a sheath : front and 

 chin each armed with a short sharp spine. Length, including 



foot, yfo^ n mcn « 



M. bicornis. 



M. stylata. Body soft, irregularly oval ; foot a nearly straight 

 spine, less than one-third of total length : eye large, red, set like 

 a wart on the back of the occipital sac : forehead conical, pointed. 

 Length, including foot, y|(jtn inch. 



Asplanchna Brightwellii. 



A. priodonta. This genus was established by me in a paper 

 published in the ' Ann. and Mag. of Nat. Hist/ for July 1850. 



* For the use of these terms the reader is referred to a paper " On the 

 Anatomy of Notommata aurita,"' in the Trans. Micros. Soc. vol. iii. pt. 2. 



