JEuchlanidota.] infusorial animalcules. 651 



from which it is distinguished by the absence of vibratile cilia, and of 

 a red eye speck, and especially by the singular structure of its jaws- 

 Length 1-76 th. Found near Pciris. 



Familt — ALBEHTIENS. 



Body cylindrical, vermiform, round in front, with an oblique 

 opening, from which a ciliated organ protrudes itself, almost larger 

 than the body ; terminated 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, Alhertia 

 vermicidaris, which is found parasitic in the intestine of Lumhrici and 

 snails. Length l-79th to 1-4 7th. 



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.— EUCHLAKIDOTA. 



Comprehends loricated Rotatoria whose rotary organ is compound, 

 being divided into several parts, always more than two. The shell- 

 like covering, says Dr. E., resembles cither that of tortoises or that of 

 crabs; the former when only open at the ends (testa testula), the 

 latter when open also on the under side, or back, forming a little 

 shield fscidellum.J As appendages, we find setse in Euchlanis and 

 Stephano2}s ; uncini in Colurus ; little horns in Dinocha/ris ; spurs, 

 or respiratory tubes, in Euchlanis and Salpina ; and a hood in 

 Stephanops. They also possess a foot, mostly furcate, but in a very 

 few simple and styliform. Only three species are destitute of eyes. 

 Separate muscles for moving the rotary organs exist in all the genera, 

 and internal free ones in three species of the genus JEuchlanis ; 

 muscles for moving tPie foot are also visible. The nutiitive apparatus 

 consists of a muscular oesophageal head, with two jaws pro-sdded 

 with teeth ; these are free fgymnogomphiaj in all the species 

 examined. They have a very short oesophagus. Eight genera have 



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