NEW ENGLAND HYDROIDS 41 



sibly the specimen referred to bv Murbach.i as being much like G. gemmosa 

 (Cornyitis agassizii), -n-as G. costaia Gegenbaur, as this sjiecies differs 

 from G. gemmosa in the points that he mentions. Since they are so 

 much alike in their structure and their habitat, it is quite possible that 

 G. costaia has traveled north as well as G. gemmosa. 



BouGAixviLLiA cAROLixExsis (McCradij). 



Yerrill gives the range of this species from Charleston, S. C, to Vineyard 

 Sound and as far as I can make out, no record has since been made of 

 its appearance farther north than this. On the other hand, the range of 

 B. supercUiaris is said to extend from Newport, R. I., to the Bay of Fundy 

 and possibly to Greenland. Unless specimens are in good condition, it is 

 difficult to distinguish the one from the other as the tentacles, and in 

 some cases the whole hydranths. disintegrate rapidly. Specimens of Bou- 

 gainvillia were found at Basin Cove, South Harpswell, in which the medusa 

 buds were not far enough developed to use for diagnosis, but all the other 

 characters agree with those given for B. carolinensis, as distinct from B. 

 supercUiaris, hence I have little doubt that the specimens belong to the 

 former species. This would extend the range for B. carolinoisis to the 

 north of Cape Cod. There is little evidence to show that Cape Cod is a 

 dividing point for hydroid fauna to such an extent as it is said to be in 

 some other groups of marine animals, but I hope to have more to say 

 on that matter at some later date. 



Calyptospadix cerulea Clarle. 



In a paper written two years ago,- C. TY. Hargitt refers to this species 

 which at that time appeared to be rare. The first Woods Hole specimens 

 were ol;sen-ed on the piles of the V. S. B. F. wharf in 1908, and the 

 following year other specimens were obtained at Wareham by Mr. Yinal 

 Edwards. 



Mr. Edwards kindly informed me exactly where the Wareham specimens 

 were obtained, and on August 7 I had an opportunity to visit the locality. 

 I had no trouble in finding specimens; in fact they were in such abundance 

 that no one who had ever collected hydroids could fail to observe them. 

 The colonies formed an encircling mass on almost every pile of the bridge 

 over the river where the main current was flowing, for several inches near 

 low tide mark. On that day the tide was particularly favorable, so that 

 in many cases the colonies were exposed. 



If. as Dr. Hargitt supposes, tliis hydroid has been recently introduced, 

 the conditions at the "VYareham bridge must be particularly favorable, to 

 produce such numerous colonies in such a short time. It may be, however, 



^ Hydroids from Woods Hole. Mass. Quarterly .Journal of Microscopical Science. Yol. 

 42, pt. 3. New Series. 1899, p. 355, footnote. 



' New and little known Hydroids of Woods Hole. Biol. Bull., Yol. XVII, Xo. 6, 

 p. 371. 



