1909. ] IN BRITISH SPECIES OF CORALS. 293 
a parallel example of the behaviour of the colony as an individual. 
Jn these animals the whole zoarium (colony) undergoes growth- 
stages just as does the individual (zoecium). This was first 
pointed out in Polyzoa by Cumings*, and he termed the colonial 
developmental history Astogeny, as contrasted with the individual 
Ontogeny. 
VII. Inpivipuat Cosrat Lire-Hisrories of THE DESCRIBED 
Species oF Encuish Parasurcrd. (Text-figs. 39-46). 
[ Note.—The letters B.M. in the following descriptions mean “British Museum.” 
The stages in the life-history of the individual are lettered thus : A, B, C,..&c.; 
the costal-stages of the whole series; {., II., IIL, &c.] 
1. PARASMILIA SERPENTINA Edwards & Haime. (Text-fig. 39.) 
Parasmilia (?) serpentina Kdwards & Haime, 1850, “ British 
Fossil Corals,” Mon. Pal. Soc. p. 51, pl. vii. figs. 3, 3a, 3 6. 
Type-specimen, B.M. no. 48414. 
Text-fig. 39. 
PARAS/UILIA SERPENTINA, 
Ldwards & Haime. 
E* CYLINDRICAL STAGE. 
REJUVENES CENCE. 
CYLINDRICAL STAGE. 
REJUVENESCEN CE « 
CYLINDRICAL STAGE . 
TROCHOID STAGE. 
<< REJUVENES CENCE. 
LTROCHO/D STAGE. 
% a 
= REIWVENES CENCE , 
Diy. 
PEDUNCLE STAGE. 
OY 
Costal stages in P. serpentina Edwards & Haime. 
Type-specimen, B.M. no. 48414. x 24. 
* E. R. Cumings, 1904, American Journal of Science, series 4, vol. xvii. p. 49. 
