NYMPHONIDAE 



25 



it is apparently an adult male, for the genital pores are quite distinct. The neck is short, 

 and the tarsus is not quite as long as the propodus, so that in these respects it resembles 

 the specimens from St. 195. But the second coxa is very long, as in the specimen from 

 St. 181. Now, as a general rule, specimens of P. autarcticum do not appear to reach 

 sexual maturity until they are somewhere in the neighbourhood of 6 mm. in length. The 

 smallest syntypes examined measured 3 -4-3 -8 mm. in length and were obviously 

 immature. It is very probable that the specimen from St. 170 belongs to a much smaller 

 species than P. antarctictim. But until more specimens are forthcoming, and until more 

 is known of the changes that occur during the post-larval development of P. antarcticum, 

 this question must remain undecided. 



Measurements {mm.) 



* See also Caiman, 1915, p. 28. 



