BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



75 



Tunicata : 



Molgula arenata. — New Haven to Nantucket. (?) 

 Eugyra glutinans. (N.) 



Lophopsetta maculata. — Casco Bay to South Carolina. (S.) 



Passing reference should likewise be made to certain species which were taken at 

 less than 10 stations, and which, therefore, are not included among those charted. 

 Some of these species are Polymastia robusta (a sponge), Tealia crassicornis (an anemone), 

 Ophiopholis aculeata (an ophiuroid), Thyone unisemita (a holothurian), Pandalus lep- 

 tocerus (a shrimp), and Hyas coarctatus (a crab). Each of these has been recorded 

 more than once at the open ends of the Bay and the Sound, but never, so far as we know, 

 in the more inclosed waters. 



For the sake of comparison with the foregoing, a list is presented herewith com- 

 prising those species which were taken at two or more of the seven regular Survey stations 

 at Crab Ledge, off Chatham. Here, as stated above (p. 51), the bottom temperature of 

 the water in summer is considerably lower than at the western end of Vineyard Sound, 

 and many degrees lower than in the greater part of the area dredged by us. 



XI. — Species dredged at 2 or more of the 7 Survey stations at Crab Ledge. 



FORAMINIFERA : 



Discorbina rosacea (3). 

 Porifera: 



Polymastia robusta (5). 



Halichondria panicea (5). 



Desmacidon palmata (6). 

 Hydrozoa: 



Eudendrium ramosum (2). 



Hydractinia echinata (7). 



Tubularia tenella (3). 



Tubularia crocea (6). 



Sertularella tricuspidata (3). 

 Actinozoa: 



Metridium dianthus (5). 



Alcyonium carneum (3). 

 Bryozoa: 



(Not listed for these stations individually.) 

 Asteroids a: 



Henrlcia sanguinolenta (5). 



Asterias austera (6). 



Asterias vulgaris (7). 

 Ophiuroidea: 



Ophiopholis aculeata (6). 

 Echinoidea: 



Strongylocentrotus' droebachiensis (7). 

 Annulata : 



Harmothoe imbricata (3). 



Nereis pelagica (5). 



Nothria conchylegia (2). 



Thelepus cincinnatus (6). 



Pseudopotamilla oculifera (4). 



Chaetinopoma greenlandica (2). 



Filograna implexa (5). 



Amphipoda: 



Ericthonius rubricornis (2). 

 Decapoda: 



Pagurus acadianus (6). 



Pagurus kroyeri (4). 



Hyas coarctatus (5). 



Cancer irroratus (3). 

 Pelecypoda: 



Anomia simplex (2). 



Anomia aculeata (4). 



Pecten magellanicus (4). 



Mytilus edulis (2). 



Modiolus modiolus (6). 



Modiolaria laevigata (5). 



Venericardia borealis (3). 



Astarte undata (3). 



Cyclas islandica (2). 



Spisula solidissima (4). 



Thracia septentrionalis (2). 



Saxicava arctica (4). 



Cyrtodaria siliqua (3). 

 Gastropoda: 



Coryphella salmonacea (3). 



Buccinum undatum (6). 



Chrysodomus decemcostatus (2) 



Tritonofusus stimpsoni (3). 



Boreoscala groenlandica (5). 



Polynices triseriata (2). 



Velutina zonata (2). 

 Tunicata: 



Halocynthia echinata (2). 



Amaroucium stellatum (3). 



Didemnum lutarium (6). 



