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aeruginosiis are active. Associated with the older part of the 

 Bermuda stalactites, I found a small gasteropod mollusc, (KalieUa 

 turbinata Gulick), hid away in small holes, or irregularities of their 

 surface. In conclusion, we find by the study of the material 

 from Bermuda, that other algae are concerned in the formation of 

 stalactites besides those described from Yellowstone Park, and 

 if a comparative study were made of stalactitic material from all 

 parts of the world, the writer has no doubt that the list of algae 

 concerned would be a respectable one. 



ON ERIGERON PUSILLUS NUTT. 



By N. L. Britton 



I was much interested in reading Dr. B. L. Robinson's remarks 

 on this species published in Rhodora for December, 1913, and, 

 especially, because it was the study of specimens from Bermuda 

 which enabled him to recognize the difference between this 

 species and E. canadensis L. During a visit to Bermuda in late 

 May and early June of this year, in company with Mr. Stewardson 

 Brown, we studied these plants in the field, and our observations 

 led us to agree with Dr. Robinson in ability to recognize the 

 two species without any difficulty whatever, Mr. Brown having 

 previously had similar experience in southern New Jersey. From 

 the standpoint of the Bermuda flora, my interest in this plant 

 was again increased because Mr. Oswald A. Reade, in his "Plants 

 of Bermuda," published in 1883, had recorded both canadensis 

 and pusillus from these islands, although not very well expressing 

 the characters of pusillus, which he regarded as a dwarf state of 

 canadensis; the purple-tipped involucral bracts, first observed 

 by Dr. Robinson and cited by him as the salient character, are 

 constant in Bermuda and, apparently, throughout the range of 

 the plant in the eastern United States, as also the glabrate 

 feature, entire leaves and smaller size of E. pusillus. In Bermuda, 

 the two plants grow side by side in fields and along roadsides, and 

 in some localities, at least, are equally abundant. Intermediate 

 stations between Rhode Island and South Carolina are Bayshore, 

 Long Island {John McCallum), Belmar, Monmouth County, 



