408 PROF, ALLMAN ON THE EECENT RESEARCHES 



dopodia of one confluent with those of the other. Archer has 

 noticed a similar conjugation in another species, with streams of 

 tlie granular protoplasm passing to and fro from one into the 

 other. 



Diaplioropodon mobile, Archer, which is one of the largest of 

 the encased freshwater Ehizopoda, has a rude test formed of hete- 

 rogeneous foreign particles loosely aggregated round its elliptical 

 body. From an aperture in one end of the test the sarcode mass 

 protrudes in the form of a hemispherical projection, and from this 

 are emitted numerous hyaline branching pseudopodia, which fre- 

 quently attain an enormous length. But the most singular cha- 

 racter of the genus is found in the fact that from the whole of 

 the included surface of the sarcode body are emitted very nume- 

 rous, short, simple, hyaline pseudopodia which traverse the outer 

 case, giving to its surface the appearance of a dense flocculent 

 clothing. The animal is further remarkable in the possession of a 

 marginal pulsatile vesicle like that of Actinophrys. A large glo- 

 bular nucleus is immersed in the body. 



In none of the Monothalamia now described have more than 

 one definite orifice been detected. In Diaplioropodon alone, be- 

 sides the definite single orifice, there would appear to exist in the 

 membranous basis of the test a vast multitude of minute pores 

 through which delicate pseudopodial filaments are emitted, and 

 which call to mind the condition of the true Perforata. All these 

 constitute the Monothalamia monostomata of Hertwig and Lesser. 

 There exist, however, forms in which two definite pseudopodial 

 orifices are present ; these are the M. amphistomata of the same 

 authors. 



One of these has been recorded by Barker * under the name of 

 DiplophrysArcheri (fig. 8) , and has more recently been made the sub- 

 ject of some very interesting observations by Hertwig and Lesserf. 

 It has a simple elliptical membranous test and, notwithstanding 

 its minuteness, is rendered conspicuous by a bright yellow fat- 

 globule enclosed in its sarcode. The two orifices from which the 

 brushes of pseudopodia radiate are nearly, but not exactly, at oppo- 

 site ends of the longer diameter of its oval test. Each brush 

 springs from the extremity of a short stem-like process of the sar- 

 code. The conspicuous large yellow globule in the interior con- 

 sists apparently of a solid fatty matter. Near to this is a nucleus 



* Quart. Joum. Micr. Sci. vol. xvi. 



t " Ueber Rbizopoden " &c., Arch. f. mikr, Anat. vol, x. 



