490 THE AMERICAN NATURALIST. [Vol. XXXVIII. 



lateral borders of the cloacal aperture, and nearly to the time of 

 birth have a curious resemblance to a pair of . rudimentary limbs 

 (Fig. 2). Shortly before birth they are drawn into the cloacal 

 aperture, and by a process of invai;ination are converted into a 

 pair of slender pouches which extend backward into the caudal 

 region for a considerable distance behind the cloaca. They then 

 lie on the ventral side of the tail and immediately internal to the 

 muscles of the integument. 



It is a remarkable fact that these copulatory organs develop 

 in f 1 al as well as in males. In females, however, they cease 

 their development after they are converted into post-cloacal 

 pouches, although they are retained throughout the life of the 

 annual. In the males, on the other hand, they increase greatly 

 in size at the, time of sexual maturit\-. During the act of copu- 

 lation the largo l^lood sinuses with which they are provided 

 become distended with blood. This surcharging with blood, 

 together with the contraction of certain muscles which surround 

 the pouches, causes the phalli to be everted to their original, 



copulatory api)en(lages'. 



Some Account of the Temporary lUolo^^rU-al Station at In rmuda 

 for the Season of igoj : Charles L. Bristol, \ew York Uni- 

 versity. — The following invitation was issued about May i, 1903 : 



Harvard University and New York University unite with the 

 Bermuda Natural History Society in inviting botanists and zool- 

 ogists to spend six weeks in the temporary biological station 

 provided for the present season at Bermuda. 



By special arrangements with the Quebec S. S. Co. and the 

 Hotel Frascati it has been possible to make the total expense, 

 including transportation from New York and return, and board 

 and lodging for six weeks at Bermuda, one hundred dollars. 



The Bermuda Natural History Society has expressed its inten- 

 tion to do everything in its power to make the summer's work 

 as profitable and pleasurable as possible, and to this end has un- 

 dertaken to provide, among other things, the necessary facilities 

 for collecting, .namely, a steam launch, thirty to forty feet long, 

 with crew ; a sail boat with fish-well and crew ; three rowing 



