258 Mv. II. J, Carter on Filujcrous Green 



have inferred to be its primary active form, the resting im- 

 pregnated spore being probably spherical, as it is when under- 

 going impregnation (see fig. Ann. /. c.) in the Avell-known 

 elli])tical figures of Eudorina. 



The cell of Volvox glohator^ which is dioecious, is spherical ; 

 and the cell of V. stellatus is obtusely elliptical (see Annals, loc. 

 cif.). 



To these three species respectively I conceive the Avhole of 

 the forms in Ehrenberg's 3rd and 4tli plates, together with 

 figs. 31 to 36, in plate 2, inclusive, to belong. 



I think that a German naturalist has already witnessed and 

 described the development of one of the Volvocina from the 

 resting-spore ; but my means of reference are now too limited 

 to enable me to find out this more satisfactorily. 



Glenoclosterium, nov. gen. 

 Glenoclosteriiim varians^ n. sp. 



Cell-wall fusiform, spindle-shaped, elongated, acuminated, 

 transparent. Body more or less inflated and more or less 

 confined to the centre, filled with protoplasm, granules, and 

 chlorophyll ; presenting a nuclear cell in the centre, a red 

 eye-spot at one end, and four or more large chlorophyll- and 

 starch-bearing utricles arranged longitudinally, decreasing 

 in size from the centre tow^ards each extremity. Extremi- 

 ties attenuated, pointed, colourless, transparent. Size, 

 l-257th of an inch long by l-1800th broad in the centre. 

 (Fig. 16.) 



Hab. Island of Bombay ; freshwater pools during the rainy 

 monsoon ; in company with Gidainydococcus and many other 

 green filigerous Infusoria. 



Ghs. This is a very interesting form, inasmuch as it is a 

 link between Euglena and Closterium. It has the eye-spot of 

 Euglena (fig. 16 a), but not the cilium, and the form generally, 

 together with the chlorophyll- and starch-bearing utricles (/>), 

 of Glosterium, without its characteristic circulation. I cannot, 

 however, help thinking that it is a form of the Ghlamy do- 

 coccus which I have already described and figured (Annals, 

 1858, vol. ii. pi. 8) ; for this species, as I may have to show 

 hereafter, appears to be exceedingly sportive in its develop- 

 ments. In one instance it was found in the still form, with a 

 conical, trans])arent, comet-like elongation of its cell on one 

 side only J which form it maintained through all its groups and 

 subdivisions (fig. 21). That Avhicli I have just described owes 

 its Closteriwn-^^nxc. to this conical extension into an atteiuiated 

 form being added to both sides. In fig. 17 the inflation is 



