22,- NEW YORK STATE MUSEUK 



theca is found nearest to the apical part of the sicula and buds very close 

 to the apex of the latter. The second theca buds, as far as my material 

 shows, from the first theca and close to its budding point and the third from 

 the second also close to the apex of the latter. As a result of the proximity 

 of these points of origin, all three thecae seem to spring from the sicula, 

 and the latter is more or less forced out of its original direction, a feature 

 which is most developed in C. calicularis on account of the relative 

 stoutness and width of the thecae [see text fig. 126-31]. In the long and 

 slender C. gracilis, the sicula and thecae retain nearly the same 

 direction. 



From the fact that in C. calicularis which lends itself best to a 

 study of the structure, one observes two thecae, when the rhabdosome is 

 seen from one side, and three when it is seen from the other [see text 

 fig. 126, 127, 129, 130], I infer that the second and third thecae arranged 

 themselves symmetrically on both sides and a little forward of the first 

 thecae, thus that the second came to lie on the right and the third on the 

 leftside of the sicula. In specimens, like that reproduced in figure 120, 

 where one part of the rhabdosome is preserved with the periderm and the 

 other only in a cast of the latter, this relative position of the three thecae 

 becomes directly visible [see also fig. 127]. 



It is possible that the rhabdosomes of this genus were united into a 

 colony of still higher order. At least would this seem to be suggested by 

 occurrences like that reproduced in plate 13, figure 17, where a number of 

 rhabdosomes form a group which on account of the direction of the rhabdo- 

 somes and the fact that no other specimens of Corynoides were found on 

 the same slab — which is quite barren of fossils — quite likely represents an 

 original condition. Also another group is quite suggestive, though on 

 account of the great number of individuals on the slab more liable to be 

 the result of accidental drifting. Whether the peculiar appendages of the 

 nema, which in text figure 131 have the shape of small triangles and there- 

 fore might well be the apical parts of siculae, indicate a further composition 

 of tlic colonics, is very doubtful, since similar appendages of the nema have 

 also been observed in other genera. 



