40 



The table only refers to such examples as have been kept 

 over a period. There are besides many records of the sizes of the 

 early stages, and of the results of ecdyses at late stages. These, 

 however, do not help us to understand the facts of the tables, which 

 will come as a surprise to all interested in the growth of Crustacea, 

 even after the presentation of the preceding examples. The stages 

 are two Waddington series (W) in the British Museum. The 

 first is probably a male (1906-1909), the second (1904-1909) is a 

 male ; two Brook's series (B) of males : and two females reared 

 at Cullercoats (C) from the eggs. The one lost on May 10th, 1913, 

 undermined the stones under which it lay, and one of the stones 

 fell and crushed it. The other after reaching a size of 150 mm. 

 w^as lost in some such similar manner, but the exact cause of death 

 was not apparent. The Norwegian series of Appelloff referred to 

 by Williamson (1905) show the same growth as those recorded 

 above, 2 years 3} ins. (8-25 cm.), 3 years 4 J ins. (11-4 cm.). A 

 second specimen got measuring 4| ins (12 cm.) after casting twice 

 in the next year reached 7 ins. (17-8 cm.), and after another cast 

 in the second year 8^ ins. (20-6 cm.). The facts may be broadly 

 summarised (Table VIII.) to indicate the size at the end of the 

 respective calendar years of lobsters reared in aquarium conditions. 



The facts of Table VII. have been used to make the diagram 

 reproduced herewith (fig. 10). In this case no attempt has been 

 made to smooth the results. The figure shows that the early 

 stages reared at Cullercoats and the two males reared by Mr. 

 Waddington follow the same general trend of growth, and the 

 older stages (B) of Brook's fit into the record as well. But it is 

 manifest that if we are to accept these facts as exhibiting truly 

 the growth of the lobster, maturity is not reached until about 



