76 BULLETIN OF THE BUREAU OF FISHERIES. 



Among the foregoing species, the following have been already mentioned as 

 restricted, in Vineyard Sound and Buzzards Bay, chiefly or wholly to the colder waters 

 adjoining the open ocean: Polymastia robusta, Alcyonium carneum, Asterias vulgaris, 

 Ophiopholis aculeata, Strongylocentrotus droebachiensis , Pagurus acadianus, Hyas coarc- 

 tatus, Pecten magellanicus , Venericardia borealis, Astarte undata, Cyclas islandica, Buc- 

 cinum undatum. In reality the number of those species which are common to Crab 

 Ledge and the colder parts of Vineyard Sound and Buzzards Bay, but which are not 

 encountered elsewhere in local waters, is considerably greater than this brief list would 

 imply. 



A contrary condition is found in the case of certain species which are of general 

 distribution throughout Vineyard Sound, and in many cases throughout Buzzards Bay 

 as well, but which are nearly or quite absent from just those waters to which the fore- 

 going species seem best adapted. The following is a partial list of such, based upon an 

 examination of the distribution charts. 



XII. Species which appear to be scarce or lacking in the colder waters oj Vineyard Sound 

 and Buzzards Bay. (Limited to species which occur at 10 or more stations of the 

 Survey.) 



Coelenterata: 



Astrangia danae. — Florida to Cape Cod. (S.) 



Thuiaria argentea. — North Polar regions to Maryland. (N.) 



ECHINODERMATA : 



Arbacia punctulata. — Nantucket Shoals to Yucatan. (S.) 

 Annulata: 



Lumbrineris hebes. — Casco Bay to New Jersey. (N. and S.) 



Hydroides dianthus. — Massachusetts Bay to Charleston, South Carolina. (S.) 

 Crustacea : 



Batea secunda.. — Local. ( ?) 



Pagurus annulipes. — Nantucket Sound to Florida. (S.) 



Pelia rautica. — Vineyard Sound to Florida. (S.) 



Neopanope texana sayi. — Cape Cod to Florida. (S.) 

 Pycnogonida: 



Anoplodactylus lentus.— Long Island Sound, Vineyard Sound, Eastport, i record. (?) 



Tanystylum orbiculare. — Marthas Vineyard to Virginia. (S.) 

 Moixusca : 



Vermicularia spirata. — New England to West Indies. (S). 



Chaetopleura apiculata. — Cape Cod to West Indies. (S). 

 Tunicata: 



Perophora viridis. — Woods Hole to Beaufort, N. C, and Bermuda. (S.) 



Styela partita. — Massachusetts Bay to North Carolina. (S.) 



Amaroucium stellatum. — Cape Cod to North Carolina.? (S.) 



Amaroucium pellucidum. — Vineyard Sound to North Carolina. (S.) 



It will be noted that only one of these species has a predominantly northern range 

 upon our coast. It is also to be pointed out that, with a single exception {Amaroucium 

 stellatum), none of these species have been recorded by us from Crab Ledge." We 

 do not wish to lay undue emphasis upon such correspondences, however. It is likely 

 that some of these species actually occur at Crab Ledge, in spite of our failure to find 

 them. It is likewise probable for some of them, at least, that their distribution in 



once. We do not here refer to the above table of species taken two or more times. 



