32 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



from the specimens preserved in formaline after their death. 

 Both figures are magnified about 10 diameters. 



Somewhat similar monstrosities to these have been 

 described by Herrick* in the case of the American lobster 

 (Homarus americanus), and that author's opinion is that 

 " We have to do here with the fusion of two embryos which 



Fig. 4. Twinned Lobster larvae, hatched at Port Erin, x 10. 



are practically distinct from the first." It is possible on the 

 other hand that the doubling may be due to an injury or some 

 abnormal condition affecting the ovum or embryo at an early 

 stage. A pair of perfect twins are known to have been 

 produced from one ovum in the case of the European lobster 

 (Anderton). 



* Bulletin of U.S. Fish Commission for 1895, p. 216. 



