334 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
notes were lost in the wreck of the steamship “ Mexico.” The 
present paper, therefore, deals only with the hydroids collected in 
Puget Sound. Here the area examined was comparatively small, 
two points — Port Townsend and Bremerton — being the only 
localities represented in the collection. These two places, however, 
yielded no less than thirty species, a fact which promises well for 
the further investigation at different points on the Sound. 
Puget Sound is a very deep arm of the sea lying mainly between 
47° and 48° north latitude. It connects with the sea by the Straits 
of San Juan, a wide and deep body of water opening at Cape Flat¬ 
tery which, if we exclude Alaska, is the most northwestern point of 
the United States. Port Townsend is situated on a small bay 
about eighty miles from Cape Flattery. The water here is quite 
deep (nine to one hundred fathoms) and very cold (fifty-one degrees 
at all depths). Many of the hydroids were brought up by the 
dredge from the stony bottom across Townsend Bay between the 
mouth of Scow Bay and Marrowstone Point. Bremerton is almost 
opposite Seattle, about 38 miles from Port Townsend. Here a 
series of small bays connected by swiftly running channels offers 
a decidedly varied field for investigation. In some of the bays the 
water is rarely turned and becomes almost stagnant, so that all con¬ 
ditions of temperature are found, and here, as might be expected, 
the hydroids are quite abundant on stones, piles, and wharves. 
Before describing the hydroids of this region, I desire to express 
my obligation to Mr. Agassiz and Dr. Woodworth for their kind¬ 
ness in placing the hydroids of the Museum of comparative zoology 
at my disposal for comparison ; and to Mr. F. P. Iveppel, to whom 
I am indebted for assistance in working over the material. 
ATHECATA. 
. Pennariidae. 
So far as I am aware, this family is represented on the Pacific 
coast by only a few species, three of which have been described by 
Clarke ( Tubularia elegans Clarke, T. indivisa Linn., and T. borealis 
Clarke) and one by Agassiz (’65) (Thamnoenidia tubidaroides 
A. Agas.). 
Schneider (’97) calls attention to the fact that the main differ¬ 
ence between Ilincks’s families, Tubulariidae and Pennariidae, lies 
