362 MR. THOMPSON ON THE DECAPODOUS CRUSTACEA. 



knowledge and intelligence, that I hasten to acquit myself of so sacred and valuable 

 a trust with all the ability I am yet permitted to retain. 



PLATE VI. 



Fig. 1. Zoe of Carcinus Mcenas, magnified, and also of its natural size. 



Fig. 2. Megalope of the same, magnified, and also of its natural size. The termi- 

 nations of three pair of the subabdominal fins are only seen in the figure. 



Fig. 3. One of its subabdominal fins more highly magnified. 



Fig. 4. The posterior pair of fins magnified. 



Fig. 5. One of its inner antennae, highly magnified. 



Fig. 6. The Young Crab, resulting from the above Megalope, magnified, and also 

 of its natural size. 



