Genital Apertures in Norway Lobsters. 153 



Traces of the incessant struggle for existence were seen in several 

 individuals which had lost one or more legs (or part). In a few cases the 

 right forceps was enormously large compared to the left, and occasionally the 

 left chela was greater than the right — doubtless examples of regeneration of 

 parts. In two cases the outermost joint of the forceps was longer than the 

 second joint. No recently moulted specimen was found. 



I desire to acknowledge heartily my indebtedness to Professor J. Cossar 

 Ewart and to Dr J. H. Ashworth for their kindness in allowing me to 

 examine the stock of Norway lobsters in the Zoological Laboratory of 

 Edinburgh University. 



While these observations were in proof copy, there came to my notice 

 a paper, 1 Die Homoeosis lei Arthropoden, by Dr H. Przibram, in which in 

 a note on " Uberzahlige Geschlechtsoffnungen an Decapodenbeinen" he mentions 

 and illustrates by diagrams and photographic reproductions three of the 

 types of abnormality in male Nephrops, which are mentioned in the present 

 communication. It is interesting to note that the specimens referred to 

 are Scottish examples sent by Dr J. H. Ashworth from Edinburgh 

 University. 



1 Archiv. f. Entwicklungsmech, Bd. xxix., 1910, pp. 599-601, text-fig. 6 A-C, pi. xxi. 



(Issued separately, 6th January 1911.) 



