466 



Mr. G. H, Grosvenor. 



[Nov. 3, 



with slight variations in actual size and in relative breadth, in 

 Eudendrium, Gonothyrea, Obelia, Sertularia, Sertularella, Antennularia, 

 Plumularia, &c. ; they are also, perhaps, the most common form in 

 Solids, as may be seen from a glance at the plates in Bergh's " Beitrage 

 zur Kenntniss der Aeolidiadae," or Vayssiere's " Opisthobranches du Golfe 



FIGS. 110. 



10. 



de Marseille." I myself have found them in the following genera : 

 Kizzolia, Calma, Flabellina, Coryphella, Amphorina, Facelina, Galvina. 



Rather small spherical nematocysts, very like those of Hydra, are 

 found in Tubularia and other marine hydroids. I have found them in 

 Rizzolia, Coryphella, Facelina, and Cuthona (fig. 3). 



These facts are in no better accord with the idea of genetic relation- 



