Volvocina.] THE INFUSORIA. 117 



simple proboscis is present in all the species (at least the 

 Eixroi^ean) as the organ of locomotion &c., and transparent 

 vesicles, seemingly the nutritive apparatus,may be observed. 

 There are two species only, one green, and the other colour- 

 less ; the latter, however, is a doubtful Pandorina. 



73. Pandorina morum {Volvox rnorum, M.) The green 

 Pandorina. — Body simple, or multipartite, enclosed within 

 a simple lorica. Colour green ; proboscis twice as long 

 as the body. Figure 37 represents a cluster ; 36, a single 

 animalcule ; and 35, one in which self-division has just 

 commenced. Found in water with lemna and conferva. 

 Size of individual, 1-1 150th; ditto cluster, 1- 120th. In- 

 dividuals broken from the cluster by Ehrenberg have not 

 been above one-third the former measurement. 



74. Pandorina ? /iyaZiwe. The crysialline Pandorina. — 

 Form globular. Found in water of the Nile with conferva. 

 Size 1-5760. 



Genus XVIII. Gonium. The tablet Animalcules. — The 

 members of this genus are especially characterized by 

 being deficient both of eye and tail, but having a simple 

 lorica, and developing themselves in the process of self- 

 division in clusters, whose form is that of a regular four- 

 cornered tablet or plate. The lorica of each individual (as 

 is noticed after separation) is nearly round, and resembling 

 a mantle [lacerna), which the creature is empowered to 

 cast off, and form anew. In one of the species (G. pectorale) 

 two filiform and vibratory proboscides are placed at the 

 mouth, as organs of locomotion, &c. ; in the other species, 

 these have not been observed. Vesicles are seen within 

 G. pectorale, notwithstanding the creature abstains from 

 coloured food ; and a red speck (produced proba1)ly by 



