434 Mr. H, J. Carter 07i the DeveJojmient o/" Sorastruni, 



its cell in the condition of a macrogonidium, singly or in 

 plurality, previously to impregnation and the formation of the 

 sporangium, as in Cryptocjlena lenticularis {I. c.) and other 

 Algse of the kind ; lastly, that the facility with which the 

 enlarged and rounded individuals of a group may be separated 

 indicates that this may take place naturally, and thus that 

 each individual may originate a new group, also as in uni- 

 cellular Algae generally. 



EXPLANATION OF PLATE XIV. 



All the figures of Sorastrum spinulosum, Niig., are drawn on the scale 

 of l-6000th to I-12th inch, in order that their relative sizes may be seen, 

 Conococcus elonqatns, n. sp., fig. 10, is on the scale of l-5400th to l-12th 

 inch ; figs. 11 & 12, l-5400th to l-24th inch. The rest of the groups 

 were all smaller in size, although their cells individually might, on 

 separation, attain much larger dimensions. 



Fig. 1. Sorastrum spinulosum, Niig., typical form of coenobium or gi-oup 

 of sixteen individuals ; average size 8-6000ths inch in diameter. 



Fig. 2. The same, individual of largest size separated from the group, 

 showing the body containing nuclear (?) vesicle : a, stipes. 

 Size 5-6000ths inch broad by 4-6000ths long ; spines and stipes 

 each l^-6000th inch long. 



Fig. 3. The same, end view, outer side. 



Fig. 4. The same, sporangium, 18-6000ths inch in diam., undergoing deve- 

 lopment of its contents internally, presenting fifteen groups of eight 

 individuals each and one single individual, = sixteen groups, 

 but here represented with four groups only, for perspicuit}', viz. 

 two of sixteen individuals each (« d), each group 5-6000ths inch 

 diameter and each individual 2-6000ths broad, one of eight in- 

 dividuals ( h) of the foregoing diameter and breadth of individual 

 respectively, and one single individual (c) 4-6000ths inch broad. 

 The four circles {d d d d) are intended to show the position of 

 some of the other groups, of which the whole ( viz. sixteen) were 

 respectively developed in separate compartments indicated by 

 the septal lines (/) extending outwards from the central cell, 

 which groups, though actually all seen by alteration of the focus 

 of the microscope, could not be delineated altogether, and were 

 too indistinct and confused to admit of anything but the arbi- 

 trary and imaginary arrangement of them given in the figure. 

 Central cell (e) spherical, 3-6000ths inch in diameter, represent- 

 ing a central circular area surrounded by a number of smaller 

 cells. 



N.B. In mj^ original Notes, the whole of the groups in this 

 sporangium, with the exception of the single individual (o), are 

 set down as containing only eight individuals each ; but as 

 many of the groups subsequently seen in the contents of the 

 gum-bottle consisted of sixteen or thirty-two individuals, and 

 these seemed to have come originally from sporangia of the 

 same kind and in the same way, I have delineated two of the 

 groups (act) with sixteen instead of eight individuals each, 

 conjecturally. 



