VOL. XXXVI.J PHILOSOPHICAL TRANSACTIONS. 3QQ 



form processes. I'hese processes are covered with hair, and unite at their bases 

 without leaving any passage. 



Below the two last legs, towards the tail, are two appendages, which, from 

 their similitude, may be termed the styliform appendages. These in the male 

 are thick, hard, and void of hair. 



The tail is continued from the trunk in a gradual decrease of its dimension, 

 and is covered by plates, which extend themselves but little below the sub- 

 stance of the tail, and terminate in acute angles, without anywise diverging. 

 It is to be observed, that sometimes these plates are edged with short and thin 

 hair, and sometimes have no hair. 



The female, on the other hand, in the place of the testicle has an ovary, 

 which, like the testicle, extends itself from the stomach to near one half of the 

 tail. From the middle of the ovary a duct descends to the legs, which opens 

 at a round hole edged with hair in the first bone of the last leg but two : this 

 is the uterus. 



The two nymphaeform processes in the female make a more obtuse angle at 

 the union of their bases, are less hairy, and leave a passage, through which it 

 is probable the ova are emitted, to be affixed to the appendages under the tail. 



The two styliform appendages in the female are soft, thin, and edged with 

 long hair. The plates covering the tail, are extended much farther under the 

 tail than in the males: beside which, they diverge, in order to leave a greater 

 space for containing the ova, for the better defence of which they terminate 

 broad, and are edged with thick and long hair. 



In the hermaphrodite lobster Dr. N. found all these parts proper to both 

 sexes regularly disposed, but in such manner, that the parts proper to the fe- 

 male were to be found only on the right side, and the parts proper to the male 

 only on the left side. In the antepenultimate leg, the os uteri was very obvious 

 on the right side, as in the females, but had not the least mark of any such 

 passage in the same leg on the left side. 



The nymphasform process on the right side made an obtuse angle at its inser- 

 tion into the body, and was soft and perforated as in the females; while the 

 corresponding process made a less angle, and was more hairy and rigid at its 

 basis, as in the male. 



The styliform process on the right side was soft, flat, and edged with hair, 

 as in the female, but on the left side it was stiff, hard, and void of hair. 



In the last leg on the left side, the perforated tubercle for the passage of the 

 penis, as in the male, was very conspicuous, but without the least appearance 

 of such tubercle in the corresponding leg on the right side. 



The plates covering the tail were extended on the right side considerably be- 



