358 DESCRIPTION OF [Rotatoria- 



588. FuRCULARiA Reinhardti. Reinhardt's Furcula- 

 ria. — Body fusiform, truncated in front, foot elongated, 

 cylindrical, and shortly furcated at the end; a slight 

 stricture divides the body and head. Plate ix., fig, 397, 

 represents this animalcule extended, and^g. 398, another, 

 contracted ; the former is a side (right), the latter a back, 

 view. Found as a parasite upon Monopyxis (Sertularia) 

 geniculata, in sea water. Length l-r20th. 



589. FuRCULARiA forficula. The ear-wig Furcularia. 

 — Body cylindrical, obtusely pointed in front, the toes 

 very long, rounded, and dentated at the base, on the upper 

 side ; the rotatory organ appears to have two frontal clus- 

 ters of cilii near the eye, and a wheel-like bundle on each 

 side. Length 1- 144th. 



590. Furcularia gracilis. The slender Furcularia. — 

 Body slender, cylindrical, suddenly attenuated at the base 

 of the furcated foot ; toes straight, long, and shorter than 

 half the body. The rotatory organ appears disposed in 

 six muscular cases, between, and superior to which, is a 

 longish central ganglion, with a red eye. Found in green 

 water. Length 1-1 80th. 



Genus CLIIL Monocerca. The jilif or m-t ailed Rota- 

 toria have a single eye, situate in the neck, and a simple 

 styliform foot, resembling a tail. In two species the vibra- 

 tile cilii are distributed into about six bundles, their band- 

 like longitudinal muscles, and those of the foot, producing 

 locomotion ; the sides of the oesophagal head are unequal, 

 as also the two jaws, which have one or two teeth ; the 

 oesophagal tube is curved and long, and the simple alimen- 

 tary canal is conical, with two ear-like pancreatic glands 

 anteriorly. An ovarium and contractile vesicles evidence 



