191"] EUter-Forsijfh : Asviiliann of Southcnt California 485 



the statement made b.y Van Name for glahnnn may be applied. Con- 

 cerning the Atlantic species he writes: "The tendency to irregular 

 and indi\Tdual variation in the shape of the colony is considerable, 

 but nearly all the shapes are readily recognized as modifications of the 

 capitate form above described." For calif ornicum, we might transcribe 

 this sentence, but with the word "capitate" changed to "encrusting." 

 Undovibtedly the typical colony of calif ornicum is flat and cake-like, 

 but deviations from this in various directions are numerous. 



As to the zooids, the following differences seem to be differential : 

 the average number of stigmata, twelve, in a half -series in calif ornicum 

 is so much fewer than the number, eighteen, given for glabrum, as to 

 leave no doubt about the distinctness in this point. The number of 

 folds in the stomach wall is also undoubtedly sharply different in the 

 two species. As our table 3 shows, the folds of the californicum 

 stomach vary widely in number, the lower limit being fourteen and the 

 upper limit twenty-two ; and a cursory inspection of the table reveals 

 that the prevalent number is much nearer the upper than the lower 

 limit. Concerning the folds of glabrum, Van Name says: "The 

 stomach has as a rule a rather small number, 12 to 15, of deep longi- 

 tudinal folds ; but in some colonies the number averages higher, about 

 18 or 20 or even more." An exhaustive statistical comparison of the 

 two species would be interesting, but there is little question as to 

 what, in general, the result would be. Further, the sharp division of 

 the loop of the intestine into a portion of large and smaller diameter 

 found in californicum must be wanting or nearly so in glabrum, judg- 

 ing from Van Name's figure. There are probably minor differences 

 in the lobings of the branchial and atrial orifices, but this point 

 requires further examination. 



TABLE III 



Folds in the Stom.^ch W.'ill op Different Zooids of the S.^me Colony of 

 Amarmicium californicum 

 Colony Folds 



1. From San Diego jetty, 22-20-23-20-22-22-20-19-22-23-23-19 



outer harbor. 20-21-19-21-22-23-20-22. 



2. From San Diego piles, 21-19-20-21-19-19-20-21-20-21-20-21 



inner harbor. 16-21-22-21-23-22-22-21-16-20-16-19 



20-21-22-18-22. 



3. Santa Monica, 20-19-18-20-21-19-19-19-21-20-19-20 



1st colony. 22-19-18-19-21-22-20-19. 



4. Santa Monica, 14-12-12-12-12-14-12-12-14-13-14-12 



2d colony. 14-14-15-14-13-14-14-13. 



5. Pillar Point. 16-15-15-15-14-14-14-15-15-1.5-15-14 



13-15-16-14-14-14-14-15-14. 



