402 History of the Hairy-backed Animalcules. 



to a nearly cylindrical intestine. This widens a little in front 

 to embrace the bulbous end of the oesophagus, and extends 

 nearly to the posterior extremity. It was filled with food of a 

 rich uniform green hue, and contained many air-bubbles, 

 especially towards its fore part. On each side of the fore part 

 of this viscus, I could indistinctly trace a lengthened slender 

 body, apparently a tortuous vessel, which on one side seemed 

 to be connected with a small oval clear organ. From the fact 

 that sometimes it was quite plain, while at others I could not 

 discern any trace of it, it may probably have been a con- 

 tractile vesicle. The whole outline of the animal appeared to 

 have a wavy or notched character, indicating a tuberculous 

 surface, as in C. Slackice, if it was not an optical illusion, and 

 caused by the hairs. 



This little animal was very active, swimming with much 

 rapidity, and rarely becoming still; when confined in cells 

 formed by wool-fibres it was most persevering and often suc- 

 cessful in forcing the barriers, by getting its thin flat head 

 under a fibre, and pushing uutil it forced its body through 

 also. 



Genus IV. — Turbanella (Schuhe). 



Head distinct, surrounded by a ring of cilia ; body naked 

 above, clothed with cilia beneath; two rows of bristled pro- 

 cesses along each side ; posterior extremity a broad flat plate 

 with a central division. 



Sp. 10. T.hyalina {Schuhe). (Pl.ii. Fig. 15.) Length 1-G0th 

 to l-48th of an inch; width 1 -480th to 1-oGOth. The body is 

 lengthened, somewhat flat, transparent, colourless ; separated 

 by a strangulation from a rondo-triangular head, which is wholly 

 covered with line cilia, and bears besides a wreath of strong 

 cilia around its centre. The hinder extremity expands into 

 two hard Bat plates, which are indented comb-like on their 



edge, and are divided in the middle by a sinus, into which 



opens the cloaca. At nearly regular distances, all along each 



side of the body, are placed still' processes of the skin, to the 



number of twenty to twenty-live, projecting at right angles 

 horizontally ; and above I aese anol her row, consisting of six or 

 eight similar processes, inclined backward, making from fifty 



to seventy in the four rows. Each process bears at its tip an 



iy line immoveable seta of about its own length. These 

 processes as well as the skin itself were found bo bo quite 

 Boluble in potass, and therefore are not composed ofcMtine, 



The alimentary canal runs in a straight line through the 



whole length. The mouth, opening on the rounded front of 



the head, and BUITO led by a linel v-plait ed and indented edge, 



leads into the usual oesophagus with very thick transparent 



