130 REPORTS OF INVESTIGATIONS AND PROJECTS. 



^tea is represented by at least i species new to the North American 

 fauna. 



Catcnaria lafontii Savigny: Both genus and species are new to our fauna. 



Bugiila: 5 species, none of them reported from eastern North America, and 

 the only one yet identified is B. neritina L., of world-wide distribution in 

 warm waters. 



Beaiiia ( ?) : A beautiful species growing on the under side of Cupidaria 

 colonies. 



Hippothoa: A species which seems to be the northern H. divaricata is not 

 uncommon on shells. 



In the other genera mentioned there is nothing especially worthy of note 

 with regard to distribution, excepting possibly certain species which I have 

 not yet studied. 



The general character of the Bryozoan fauna is decidedly like that of other 

 warm regions of the globe. For example, I have recognized 15 species as 

 belonging to the Mediterranean and 21 from the East Indian and Australian 

 region, while in contrast, only 10 species of the Tortugas Bryozoa have been 

 recorded from the New England coast, and 7 of these are species of very 

 wide distribution over the North Atlantic. 



Preliminary Report on Regeneration Studies, by Charles R. Stockard, 

 Cornell University Medical College, Nerv York City. 



A more extensive series of experiments relative to the rate of regeneration 

 in Cassiopea xamachana were conducted as a continuation of my researches 

 of the previous summer. Some points not then clearly shown were worked 

 out in greater detail. Experiments to test the possibility of heteromorphic 

 regeneration as a cause of the different growth rates observed from the 

 various regions of bias-cut peripheral strips showed that heteromorphosis 

 was not the cause. My previous interpretation that the rate of regeneration 

 in both directions towards the periphery and towards the disk center varies 

 according to the level of the cut is still held to be correct. Small bias-cut 

 strips, as well as triangular and V-shaped pieces of the medusa disk show 

 great regulatory ability. Such pieces will invariably form circular bodies in 

 the most direct manner. Such small circular bodies pulsate and act very 

 much as an entire medusa disk would. 



The chief experiments were conducted with a view of determining the in- 

 fluence of the extent of injury on the rate of regeneration. Sufficient data 

 were obtained to give definite indications regarding this perplexing problem. 

 Fourteen individuals were injured in each of the following ways: The first 

 group had one of their oral-arms cut off at its base, the second to the fifth 

 group, respectively, had 2, 4, 6, and 8 arms similarly cut. We thus have 5 

 groups of individuals, each group injured to a different degree. Comparing 

 the specific rates of regeneration, we see that the least injured grow somewhat 

 faster than those with 2 arms cut away, the ones with 4 removed arms grow 

 faster than either of the groups less injured, those having lost 6 arms grow 

 still faster, and those from which all 8 of the mouth-arms have been removed 

 regenerate most rapidly of all. This seems to indicate that the rate at which 

 Cassiopea regenerates its oral-arms varies directly with the number of arms 

 removed ; the more arms cut away the more rapidly will each arm be replaced. 



None of the specimens were fed during the experiment, which lasted for 

 21 days, and all decreased considerably in size. It is important that those 



