84 Mr. H. J. Carter on Freshwater Rhisopoda 



manner in which they are suddenly retracted, with or without 

 the prehension of a particle of food — the latter seemingly pro- 

 duced by the distending power which kept the semifluid sarcode 

 in a ray-like form being suddenly withdrawn, when the sarcode, 

 accumulating into a kind of drop at the end of the filament, 

 incepts the particle of nourishment, and gradually, by amalgama- 

 tive union, withdraws it and itself into the body of the animal. 



Interiorly the body so strictly accords with that of Euglypha 

 that I have assumed that the vesiculse (which I have not yet seen 

 in Cyphoderia) are in like manner situated opposite the constric- 

 tion (for the convenience of emptying themselves there ?), and 

 therefore have provisionally placed them in this position in the 

 figure. In the posterior translucent part, which contains the 

 nucleus and " granules,^^ the latter will be observed to be oblong 

 or elliptical, and not globular as they are in Euglypha com- 

 pressa. 



The two figures of the test {d, e) on a smaller scale are given 

 respectively, to show the acuminated variety, and for comparison 

 in size with the rest of the figures. 



Sometimes the animal, instead of extending back to the pos- 

 terior extremity of the test, is attached, a little distance from it, 

 to the upper limb by a digital prolongation, in which I have seen 

 a contracting vesicle fill and discharge itself. 



The largest specimens that I have met with have been about 

 ■2-fo^th of an inch long, -5-5-0 th broad, the aperture ttVo^Ii ^V 

 a4^fl(i th, and the scales , ^ 000 th in diameter. 



A marine species (specimen ?) has been described by Prof. 

 Schultze under the name of Lagynis Baltica, out of which he 

 has made the genus Lagynis (Organ, der Polythal. p. 56, 

 tabb. 7 & 8. fig. 1). 



ACTINOPHRYS, Ehr. 

 Actinophrys paradoxa, n. sp. PI. II. fig. 20. 



Polymorphic; surface even, or furnished with capitate and 

 actiniform tentacula, separately or together ; capitate tentacula 

 short, numerous, forming a villous surface over the body, re- 

 tractile or extensile; actiniform tentacula few in number, long, 

 radiated, and much larger than the rest. Incepts crude mate- 

 rial for food. Neither nucleus nor contracting vesicle seen. 



Hah. Common in the freshwater tanks of the island of Bom- 

 bay, from April to June inclusive. 



Size. About voirth of an inch in diameter. 



Obs. This species has been designated from its changeable 

 form — viz. at one time appearing without any tentacula, and at 

 another with one or both kinds present. Figs, a, h, c represent 

 changes of form successively seen in the same individual ; and d is 



