No. 6.] AMERICAN MORPHOLOGICAL SOCIETY. 331 



degree, e.g., by cutting it in half, the posterior half may be 

 completely absorbed by the zooids posterior to it. 



The sexual individual arises as a zooid in a chain, but when 

 the sexual organs appear, asexual reproduction ceases. The 

 single sexual individual may, however, attain a length equal to 

 that of the longest chains. The power of regeneration is much 

 less in the sexual than in the asexual condition. Apparently in 

 the former the energy is chiefly directed toward the elabora- 

 tion of the sexual products. 



II. THE OCCURRENCE OF GUNDA SEGMENTATA 



IN AMERICA. 



WTNTERTON C. CURTIS. 



A SPECIES of Gnnda, which in its external features seemed 

 identical with the G. segmentata of Lang, was found in large 

 numbers at Sandwich on Cape Cod. The internal arrangement 

 is not, however, as regular as Lang describes for G. segmcntata. 

 From a comparison with Verrill's figure of Proccrodcs nlrac 

 collected in the same region (Trans. Conn. Acad., Vol. VIII, 

 January, 1893), it is probable that the two forms are identical 

 and that Verrill has figured the head incorrectly. 



III. SOME DISPUTED POINTS IN THE ANATOMY 



OF THE LIMPETS. 



M. A. WILLCOX. 



THE following points were made: 



i . The space previously described by Willcox as the nephrid- 

 ium is lined throughout by more or less columnar cells pro- 

 vided with long, delicate cilia and loaded in the fresh condition 

 with dark green granules. The histology lends no counte- 

 nance to Haller's contention that the posterior part of this 

 sac represents coelom, the anterior nephridium. 



