18 Mr. H. J. Carter on a new species of Cryptoglena. 



Cryptoglena, Ehr. 

 Cryptoglena angulosa, n. sp. PI. I. fig. 18 a, 6, c. 



Lorica compressed, oblong, angular, shield-shaped, transparent, 

 round posteriorly, square anteriorly, where it presents a short 

 neck in the median line for the passage of the cilia ; border 

 thin, curled up posteriorly and anteriorly on opposite sides. 

 Internal or green cell at some distance from the lorica, angular, 

 lined with chlorophyll, provided with two cilia, which issue 

 through the neck of the lorica; two contractile vesicles at 

 their base ; an eye-spot median and peripheral, and one to 

 four starch-cells of a circular form. Swimming with its cilia 

 forwards in an extremely irregular line. Length of lorica 

 l-1080th, and breadth l-1800th of an inch. 



Hab. Freshwater tanks in the island of Bombay. 



Obs. When I observed this Cryptoglena, it was undergoing 

 duplicate and quaternary division, when the lox'ica, which is ex- 

 tremely angular at first, loses its asperity, becomes smooth and 

 widened laterally, till at last, the division becoming complete, it 

 splits into shrunken halves, which remain attached to the internal 

 cell as in Cryptoglena lenticularis, but without the persistence of 

 the cilia. 



With reference to the incorporation of the spermatozoid with 

 the spore of Cryptoglena lenticularis, described in my last paper*, 

 I would here mention that I have since seen it take place fre- 

 quently and most satisfactorily. 



EXPLANATION OF PLATE L 



N.B. Figs. 1, 2 & 7, 8, 9, are drawn on the scale of l-40th to l-1880th 

 of an inch ; and figs. 15 to 18 inclusive on the scale of l-12th to l-5400th 

 of an inch. 



Fig. 1. Volvox globator, adult form, containing daughters and grand- 

 daughters; 57-1880ths of an inch in diameter: a, peripheral 

 cell more magnified. 



Fig. 2. Volvox stellatus, adult form, containing daughters and grand- 

 daughters; 69-1880ths long, and 54-1880ths of an inch broad : 

 a, peripheral cell (I am not sure, here, whether the external as 

 well as the internal cell is not conical; it is so in the young 

 daughter- Fo/tjoa^, fig. 6 c). 



Fig. 3. Volvox globator, daughter of, some little time after expulsion, and 

 before the great-grand-daughters or fourth family have appeared. 

 To contrast with fig. 5 at same period. 



Fig. 4. Ditto, daughter of fig. 3, greatly magnified, to show the reticulated 

 form of the gonimic conte'nts ; 18-5400ths of an inch in diameter ; 



* Annals, ser. 3. vol. ii. p. 249. 



