298 bulletin: museum of comparative zoology. 



(1915, p. 300), appeared, with other tropical organisms, in the tows 

 over the continental slope in 1914 (Stations 10218 and 10220); off 

 Marthas Vineyard in 1915 (Station 10333, one specimen); and Ptero- 

 sagitta draco, similarly tropical in origin, was represented by about 

 fifty specimens in the 60 meter haul at Station 10218, a record worth 

 noting as it has not been found before in this region, though kno\Mi 

 south of New York (1915, p. 297). 



EukroJmia haviata was taken at one station in 1912; at nine sta- 

 tions in the Gulf in 1913; at six stations in 1914, four in the Gulf 

 (Stations 10225, 10246, 10248, 10254) two on the continental 

 slope (Stations 10220, 10233). In 1915 it was taken only twice in 

 the Gulf (Stations 10304 and 10310 in hauls from 150 and 130 meters 

 respectively) ; but it also occurred in the shallow waters on Brown's 

 Bank (Station 10296), and was abundant over the slope off Shelburne 

 (Station 10295). The depths of the hauls range from 60-0 meters 

 at Station 10296 to 400-0 meters at Stations 10220 and 10233; the 

 total number of specimens being about 120. It is interesting that no 

 E. hamata were taken in the 60 meter haul at Station 10225, or the 50 

 meter hauls at Stations 10240 and 10248, since it occurred at other 

 depths at those localities. The largest catches were on the slope, and 

 in the southeastern corner of the Gulf (Station 10225). I have dis- 

 cussed the faunal significance of this species elsewhere (1915, p. 301). 



Ptcropods and Heteropods. — In 1914- and 1915, as in previous years 

 (1915, p. 303), the only members of these groups which attained 

 any faunal prominence in the Gulf of IVIaine were Limaciyia balea 

 and Clione limacina. In the summer of 1914 the former was numer- 

 ous off Cape Cod (Station 10264), and swarmed. over the northwest 

 edge of Georges Bank (Station 10215), where about 125 cc. were 

 taken in a haul at 50 meters. Considerable (though much smaller) 

 catches of Limacina were likewise made at Stations 10216 and 10259; 

 in the Eastern Channel; in the northeast corner of the Gulf (Stations 

 10246, 10247) ; and at three of the four stations on the slope (Stations 

 10220, 10233, 10261). But only one specimen was taken at the oceanic 

 Station (10218) where the plankton as a whole was tropical, and at the 

 time of our 1914 cruise it was equally wanting in the northwestern 

 part of the Gulf (Stations 10251, 10253, 10254), though this was its 

 chief center of abundance in 1912 (1914a). It was likewise rare, or 

 absent in August 1914 in the waters south and southwest of Halifax 

 (Stations 10235, 10236, 10237, 10242); on Brown's Bank (Station 

 10228) ; in the Eastern Channel (Station 10227) ; on the eastern and 

 southern edges of Georges Bank (Stations 10226, 10219), and on the 



