No. 5.] WHITEAVES — DEEP-SEA DREDGING. 263 



sp. ; t Byhlls GidmanUi ; f Ampeltsca, sp. ; f t^tihchelrus 

 pinguisSt.; \ Melita den lata; ixnd j Ton tojjoreia femomtay as 

 well as many xVnncUds, were collected. 



The Biadelle Bank, which is situated almost due south of the 

 one previously described, is also a stony patch, but the pieces ot 

 rock are usually small, and there is an admixture of gravel, 

 coarse sand and mud. Its fauna is characterized by the abun- 

 dance of its Mollusca, and by the apparent absence on it of many 

 of the softer organisms so abundant on the Orphan Bank. The 

 Hydrozoa and Polyzoa of the two banks are very similar, but 

 on the Bradellc tine specimens of TahiUlpora lohidatal Hassall, 

 were collected. The most abundant shells on the Bradelle are 

 Astarte lactea Brod. and Sow., A. elUptica, and A. Banksii ; 

 Venus fluctaosa Gould; CanUum GrcenlanJicum; CreneUa nigra; 

 C. Ictvigafa ; (J. glandula ; Macoma ad car en ; Punopcea JSfor- 

 vegica; and Ci/rtodarta siliqua. Its greatest rarities are a single 

 living example each of TrUonofusas latericeiis Moller, and Volii- 

 fopsis Norvcgicus Chemn. RJiijnclLoneUa psittacea , of large size, 

 is common on both banks. Astrophi/ton Agassizd ; Ophiogli/pha 

 Sarsii, large; 0. nodosa ; and Fsohis phantapus are frequent 

 on the Bradelle, where also a tine living specimen of Ophiocoma 

 ■nigra Muller, was obtained. The Crustacea of both banks are 

 for tlie most part similar, but on the Bradelle a few additional 

 species occurred. These are Crangon vidgaris: yBiasfi/Us, sp. ; 

 '\u4nipelisca, two species; '[Ilaploops, sp. ; jBi/hlis Gaimardii; 

 -\ Ftilochcirus plngids ; ^Harpina^ sp. ; j Faramphithoe pidchella 

 Bruz.; \QJdiceros Ij/Jiceus; '\Vertuntnns serratus; imd j jVebalia 

 bipes. 



These two banks seem to be outliers, so to speak, inhabited by 

 a purely arctic fauna, and surrounded almost entirely by a more 

 southern assemblage. The shores of the Magdalen Group, of 

 Prince Edward and Cape Breton Islands, as well as the whole 

 of Northumberland Straits as far north as the southern entrance 

 to the Ba^ des Chaleurs, are tenanted by a somewhat meagre 

 Acadian fauna. Owing to the shallowness of the water on these 

 two banks, the temperature is probably higher by some four or 

 five degrees than the average of that in the northern part of the 

 gulf. In sailing from Point Miscou to the Bradelle Bank we 

 found the temperature of the bottom (Miscou Point, bearing- 

 northwest half north, 22, miles distant) was 42'*^ Fahr. After 

 examining the Bradelle Banks, we made for Pictou, Nova Scotia, 

 and arrived there on tiie afternoon of Auuust 11th. 



