Edge, and Corsair Canyon. 



The stations on Georges Bank (fig. 1) were 

 made during M/V Delau-are cruise 61-16, 

 September 22-30, 1961. where Hudractinia 

 echinata was found on the shell of Placopecten 

 magcUanicHs (Merrill and Posgay, 1964) in 

 depths from 77 to 136 m. The stations covered 

 most of Georges Bank except the northwest 

 part where few scallops are taken. 



Several other locations on Georges Bank 

 where hydroids and sea scallops have been 

 found as.sociated are on figure 1. The records 

 are mostly the result of miscellaneous samples 

 brought to the laboratory. 



I looked for Hydractinia echinata on gastro- 



pod shells inhabited by hermit crabs during a 

 cruise (M/V Delaware cruise 60-7) along the 

 middle Atlantic from Block Island to Cape 

 Hatteras, mostly in depths of 20 to 80 fathoms. 

 May 11-21, 1960. The purpose of the cruise 

 was to determine the distribution of sea scal- 

 lops and other invertebrates. Pertinent infor- 

 mation regarding the cruise was given by 

 Merrill (1962). Stations where gastropod 

 shells and hydroids occurred together are 

 plotted in figure 1. The hydroids were found in 

 depths from 16 to 40 fathoms on shells of 

 Nassariiis trivittatus (Say), Lutmtia friseriata 

 (Say), Lunatia heros (Say), Colus pygmaeus 

 (Gould), Colus stimpsoni (Morch), and Bucci- 



MASSACHUSETTS 



400 fm- 



1 (^ 



GEORCES 

 «• BANK 



• ••• 



* 



V 



^CAPE HATT 



ERAS 



_| 



± 



± 



k2»N. 



40° 



38° 



36° 



76° W. 



74° 



72° 



70° 



68° 



66° 



Figure 1. — Distribution of the hydroid, Hydractinia, echinata, in the Georges Bank and middle Atlantic areas. 

 Circles represent locations where the hyroid was taken. 



282 



OFFSHORE DISTRIBUTION OF HYDRACTINA ECHINATA 



