3/6 CHAS. W. HARG1TT. 



axils of the hydrothecae." This I do not find to be the case in 

 the present species. Again, according to Clarke, the " gonangia 

 are small, about twice the length of the hydrothecae, rounded 

 off at the distal end, with a simple spherical, terminal opening 

 which stretches across the distal end." On the contrary, the 

 gonangia are large, about four times the length of the hydrothecae, 

 and the opening is not simple, but there is a terminal neck with 

 everted rim. It should also be said that in contrast from Clarke's 

 species in which the colony is said to be "about 12 mm. in 

 height, and but little branched," in the present case the colony is 

 from 20 to 30 mm. in height, and much branched. 



Gonosome. The medusae when liberated have 24 tentacles, 

 but others are rapidly acquired and within ten or twelve hours 

 many specimens have from 30 to 36. The general aspects of 

 the medusa are distinctively obelian ; there is the eversible bell, 

 the squarish manubrium at base, with rounded oral portion, with 

 two otocysts in each quadrant. 



Regarding the species as new, and in deference to Congdon's 

 description, I suggest as its specific designation Obelia congdoni. 



CALYCELLA SYRINGA. 



This species is neither new nor rare in this region. Reference 

 is made to it for the purpose of calling attention to certain fea- 

 tures of habitat and variation which seem of some interest and 

 importance. Nutting refers to it as " found abundantly in the 

 Woods Hole region, growing over all sorts of plant-like marine 

 organisms, especially other hydroids." This statement I am 

 able to confirm, though with a single qualification, namely, its 

 seasonal oscillations. I have found it rather imcouinion during 

 the midsummer season, and have never found it actively propagat- 

 ing at this time by sexual modes. In early spring March to 

 May it seems much more abundant and immense colonies 

 with prolific crops of gonangia are not rare. 



Another feature calls for some attention, namely, the variable 

 size and aspects of the species in midsummer. At this time 

 specimens found by me have been invariably of dwarfed char- 

 acter, so much so that for some time I was rather inclined to 

 consider it as a distinct species. Typical specimens taken in 



