220 



HYATT, 



nubs thickly strewn npon the branches. This variety oc- 

 curs only where the surfaces are sufficiently large and 

 smooth. Found only at Gorhani, Maine. 



Variety 5, PI. 7, figs. 2 and 3. The main branches 

 are not necessarily attached, but grow in clumps, the 

 colony often being attached by only a portion of the 

 branch, and the free portions of the cells long. This oc- 

 curs only on wide surfaces. 



Variety c, PI. 15, fig. 4, is an extremely dense growth, 

 the branches are so crowded that in some instances they 

 become adherent. The refuse matter in the current is 

 deposited between them, and the whole appear to be ad- 

 herent, resembling the Alcyonelloid variety of Plumatella 

 so closely, that at first sight they might be mistaken for 

 the same. This vai'iety is found only upon limited sur- 

 faces or small twis-s. 



The polypide has from 18 to 22 tentacles. The intes- 

 tine in some specimens has a faint, pinkish color. The 

 statoblasts range all the way from .166 m. m. in breadth 

 by .366 m. m. in length, to an almost orbicular outline 

 which is .299 m. m. in breadth by .316 m. m. in length. 

 In equal numbers they range as follows, from 5 by 11 

 to 5 by 12, from 6 by 11 to 6 by 14, from 7 by 10 to'7 by 

 13 ; and, finally, one specimen was 9 by 9|^. Thus, there 

 is a gradual increase in the proportional breadth from 5 

 to 7, while the length fluctuates between 10 and 14 with- 

 out regard to the breadth. 



3 5x11 0X13 6x11 6x13 9x9.5 



Fig. 13, statoblasts are all, with one exception, taken from one spot in a branch of 

 a colony from Fresh Pond, Mass. The figures underneath give the proportions of 

 the breadth to the length, except under the side view wiiere they give only the 

 bieadth. This side view is taken from a specimen found in Mystic Pond, and is 

 the longest 1 have seen, measuring .466 m. m. 



Hemarhs. The extensive distribution of this species 

 from Norway, Me., to Baltimore, Md., would prepare us 



