109 



The various species of Cosmaria seem to receive 

 substances through the hole (fig. 20. c.), which is 

 constantly open. The Colpopelta has upon the in- 

 ferior surface , at both extremities of the body , a 

 longitudinal tube (fig. 28. a.)> which seems to unite 

 both openings. 



In the Closteria we find upon the point of both 

 sides of the cuirass, perforations which I consider 

 as mouths. 



In the Closterium Lunu^a Nitzsch (fig. 5G 58.") 

 this mouth (a.) is very easily found 5 it leads to a 

 very short, and sometimes not well marked tube (b.). 

 Moreover, we observe this orifice in the Closterium 

 caudal um, a cumin alum , didymotocum and spirale 

 (fig. 59 67.). In the Closterium costalum each 

 horned extremity of the cuirass is truncated , and a 

 larger, blunt and more opened mouth (fig. 61. 63. 



b. b. ) comes out of its edges. Between this orifice 

 and the content of the animalcule, through which the 

 intestinal tube passes, the Closteria present a peculiar 

 organ, which I name rotatory bladder, without know- 

 ing its functions. Some naturalists have taken those 

 bladders for feet; but feet, entirely surrounded with a 

 cuirass, and without any communication with the out- 

 side, would answer very ill the purpose of moving. 



This spherical organ is always found under the 

 orifice, and in the Closlerium Lnnula under the mouth 

 (fig. 58. b.) and the intestinal tube. That bladder 

 is transparent, round, circumscribed in itself (fig. 58. 



c. 62 63. a. 73. e. 65. c.)> the number of which 



