THE HOMARUS MARINUS. 



457 



seven pairs of legs, which are furnished with an oar-Hke branch on 

 the third joint. The abdomen has six segments only, and no 

 appendages ; and the tail or telson is flat and pointed, with a 

 strong projecting central spine. In Fig. 3 M. Gerbe shows that 

 the resemblance to the adult has become greater, but the great 

 antennas, rostrum, and chelate extremities, and the appendages 

 of the abdomen, are not yet developed. 



YOUNG LOBSTERS. 



I. Embr}'0 in the egg. 2. Zofa just born. 3. After the first moult. 



Let us examine Fritz Miiller's description of the metamorphoses 

 of a prawn, which is a stalk-eyed Crustacean, and closely allied to 

 the lobster (from W. S. Dallas's admirable translation of " Facts for 

 Darwin*"). The young of the genus Pencils quit the (12,^ totally 

 unlike the adults, and the extent of the metamorphosis is as great 

 as in any of the true Insccta. The youngest forms have, when 

 they quit the Q^'g, an ovate body without any segments ; they have 

 a solitary frontal eye, and three pairs of swimming feet, of which 



