1892] MARYLAND ACADEMY OF SCIENCES. 219 



I was led to look for Cordjlophora in the Patapsco by 

 tlie fact that Cinder Cove specimens lived about as well 

 in the aquarium containing tide water from this estuary 

 at Baltimore as in that containing water from their native 

 estuary. The suspicion of their occurrence at Baltimore 

 was strengthened by the fact that both in Europe (6, pp. 

 l:3-5)" and in the United States (5, p. 113) the colonies 

 have most often been found in the vicinity of seaports 

 situated upon estuaries, at points where the salt of the 

 tide-water is scarcely or very slightly perceptible to the 

 taste (which is usually the case with the Patapsco in the 

 vicinity of Baltimore), whither doubtless they are distrib- 

 uted by vessels (cf. 7, p. 253). January 30, 1891, Mr. G. 

 C. Price and myself visited the docks of Locust Point, 

 hoping to find the colonies there. We examined the piles 

 of the wharves at several apparently favorable points near 

 Federal Hill, with a negative result. On the Patapsco 

 side of Locust Point, however, we were more successful. 

 Near the site of old Fort Covington (immediately above 

 Winan's cove) stand at this date four long docks, now 

 mostly out of use, but formerly connected with the oil 

 yards (several years since burned) of S. Fancher & Co. 

 At this point the water of the Patapsco is tolerably clear, 

 except after heavy or prolonged rains, when it is somewhat 

 clouded by the wastings from the fine clays in the lower 

 portion of its basin, and during the warmer periods of the 

 summer months, when it is contaminated somewhat by the 

 drainage of the city. The average depth of the water at 

 the bank is at this point about four feet. Here the sur- 

 roundings appeared somewhat more favorable for the 

 growth of the hydroids, and we found them on the piles 

 of the break-water of the bank at every point examined 

 below low tide mark. 



I visited this locality from time to time until late in 

 April, when I observed the appearance of gonophores. 



