6o 



Records of the Indian Museum. 



[Vol. XXII, 



almost exact duplicates of each other. This may be seen readily 

 if one inspects the margins, and especially a cross section of a 

 branch. As is characteristic of this genus, the zooecia are poly- 

 morphic consisting of three kinds of individuals: i, the oidinary 

 nutritive zooecia (fig. ii, A and B, nu. zee.), 2, the ocecial 

 zocEcia (B, oe. zoe.), 3, the avicularian zooecia (B av. zcf.). The 

 middle portion of each branch is occupied by six or eight rows of 

 nutritive zooecia regularly alternate (A, ntt. zoe.). Bordering these 

 on each side are two or more rows of large reproductive zooecia, 

 and outside these a row of large avicularian zooecia. 



I'll.. I|. — Adeoiiella iiiarginafa, sp. nov. X 40. 



A. Four young zooecia in middle portion of a 



B. To show tile three kinds of /ooeecia on 



colony. 



'4"fTVMS. 



A 



branch, 

 the inargfin 



of the 



At the tips of the branches, the young nutritive zooecia (fig. 

 II, A) are more than half immersed although the whole of the out- 

 line may be detected while the matrix is thin. Front wall hyaline, 

 non-porous. Orifice round with a deep wide sinus, the upper edges 

 of which soon close to form a large pore (p.). On each side of the 

 pore an avicularium with triangular mandible directed upward. 

 Lower down, somewhat to one side of the median line, another 

 avicularium with mandible directed transversely (B). In older 

 zooecia avicularia increase in number and with increase in calcifi- 

 cation mav increase or decrease in size. 



