ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 223 



Attention is directed to a variety whicli was coloured green by chloro- 

 phyll-granules, and to another in which, in the place of regular, 

 there were developed dendritic tubes. The stiff processes in one form 

 were observed to be able to function either as cilia or as pseudopodia ; 

 and the two conditions may succeed one another with great rapidity. 



The third and concluding portion of the paper deals with the 

 phenomena of the fusion of several individuals of Actinophrys Sol* 



New Flagellate— Chlorodesmos hispida.t — Mr. F. W. Phillips 

 records a new form (from pond-water at Hertford) differing so 

 strikingly from all other known forms that it is necessary to institute 

 a new genus for its reception, Chlorodesmos (Mspida). 



It is found in colonies of about thirty zooids, grouped together in 

 a chain-like manner, and possibly united by a contractile, hyaline 

 ligament of extreme delicacy. The constituent zooids each inhabit a 

 closely-fitting lorica of a somewhat triangular aspect, pointed anteriorly, 

 and twice the width posteriorly at the point of attachment. The lorica 

 is covered with very minute spinous processes of even length. At the 

 anterior extremity there is a slight indentation, in the centre of which 

 is the oral aperture, which is continued into a short, distinct, tri- 

 angular, pharyngeal cleft or cavity. Seen from a side view, the lorica 

 has an oval aspect. The flagella are two in number and of equal 

 length, issuing from the pharyngeal cleft. The endoplasm contains 

 the two characteristic lateral pigment-bands ; there are no eye-spots ; 

 one contractile vesicle is developed posteriorly. 



The most remarkable characteristic in connection with these colonies 

 is the peculiar movements, which are of a twofold nature. The first 

 consists of an elongation and corresponding retraction of the whole 

 chain of zooids to about five times the retracted length. During these 

 movements one end of the chain is anchored to some substance, the 

 other floating freely with a worm- like motion ; these movements take 

 place at the rate of about three per minute. The second movement is 

 a clapper-like motion, each zooid closing upon the other, like the two 

 shells of a bivalve mollusc ; this motion is much quicker than the 

 former, and is irregular, while the former is rhythmical. 



Owing to the awkward position of those groups seen, Mr. Phillips 

 has not been able to make out clearly the nature of the supposed 

 elastic integument which unites the zooids, but from a careful examina- 

 tion of the movements he has but little doubt as to its existence. 



Chlorogonium euchlorum, Ehrenberg.J — J. Krassilstchik has 

 studied the developmental stages and resting period of this form. The 

 young produced from the resting-cells have a brick-red colour at first 

 and do not usually possess a fusiform shape ; the green colour of later 

 generations is darker than that of the first, and is produced by 

 granules of chlorophyll. As observed by Stein and Eeinhard, pul- 

 sating vacuoles occur ; of these there may be as many as sixteen, quite 



* See this Journal, ii. (1882) p. 800. 



t Trans. Hertfordshire Nat. Hist. Soc. and Field Club, ii. (1882) pp. 92-4 

 (1 pi.)- 



X Zool. Anzeig., v. (1882) pp. 627-34. 



