BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 107 



Scruparia clavata British Isles, Gulf of St. Lawrence. 



Cellularia peachii Northern Atlantic and Arctic seas; Labrador, Gulf of St. Lawrence, St. 



Georges Banks. 

 Menipea ternata Northern Atlantic and Arctic seas; Labrador, Gulf of St. Lawrence, 



Grand Manan. 

 Caberia ellisii Northern Atlantic and Arctic seas; Greenland, Labrador, Gulf of St. 



Lawrence, Maine. 



Bugula cucullifera Maine, off Cape Cod. 



Bugula murrayana Northern Atlantic and Arctic seas; Greenland, Labrador, Gulf of St. 



Lawrence, New England. 

 Membranipora cymbaeformis. . . .Northern Atlantic and Arctic seas; Gulf of St. Lawrence. 



Membranipora craticula Northern Atlantic and Arctic seas, Davis Strait, Gulf of St. Lawrence. 



Membranipora unicornis Northern Atlantic and Arctic seas; Greenland, Gulf of St. Lawrence, 



North Pacific. 



Membranipora arctica 



Cribrilina annulata "Eminently a northern form;" Spitzbergen, Greenland, Labrador, 



Gulf of St. Lawrence, Grand Manan. 



Porina tubulosa Northern Atlantic and Arctic seas; Gulf of St. Lawrence. 



Schizoporella auriculata Red and Mediterranean Seas to Arctic Ocean; Gulf of St. Lawrence. 



Schizoporella sinuosa Northern Atlantic and Arctic seas; Gulf of St. Lawrence. 



Cellepora canaliculata Gulf of St. Lawrence ; off Halifax. 



Mucronella pavonella Northern Atlantic and Arctic seas , Gulf of St Lawrence, North Pacific. 



Smittia porifera North Atlantic and Arctic seas; Gulf of St. Lawrence, Florida, South- 

 Africa, Australia. 



Porella propinqua Northern Atlantic and Arctic seas; Gulf of St. Lawrence, Davis Strait. 



Porella acutirostris Northern Atlantic and Arctic seas; Gulf of St. Lawrence. 



Porella concinna Arctic seas to Mediterranean, Greenland, Gulf of St. Lawrence. 



Rhamphostomella costata Northern Atlantic and Arctic seas; Gulf of St. Lawrence. 



Alcyonidium parasiticum British Isles. 



The following notes have been furnished by Dr. Osburn relative to differences of 

 habitat displayed by different members of the same genus: 



Crisia. 



C. eburnea: Our most familiar species; abundant in shallow waters, but extending to the deepest 

 waters of the region. 



C. cribraria: Found only in the outside, colder waters. 

 Bugula. 



B. turrita: Abundant under all conditions in the inner waters; less common in the cold waters off 

 shore, e. g., at Crab Ledge. 



B. flabellata: On piles and in shallower waters down to a few fathoms; almost wholly confined to 

 adlittoral zone. 



B. murrayana: Abundant in outer waters on stones and shells; not found in inner waters. 

 Membranipora. 



M. cymbaeformis: Common upon hydroid and other stems in outside waters. 



M. pilosa: Common throughout our waters on shells and algae; differing in the form of the zooecia, 

 according to substratum occupied. 



M. unicornis: On stones and shells in outer waters. 



M. monostachys: Throughout our waters; common, usually upon very smooth surfaces, such as 

 inside of shells, on skate eggs, carapace of Limulus, etc. It presents differences of form, accord- 

 ing to whether it grows in inner or outer waters. 



M. tenuis: Common upon stones and shells, but not in shallow waters near shore. 



M. flemingii: (Much as last). 



M. aurita: Common on stones, shells, and algae, at all depths. 



M. tehuelcha: Only found upon drifting gulfweed. 



