DlATO-MACEiE— .SKELETONEJIA 351 



Atujust: 72° N. 26° E., rare; 55^ N. 26° W. to 56° N. 38° W., 



very common. 

 September: 68°— 69° N. 8°— 10° W, rare; 74° N. 18° E. to 80° 



N. 13° E., rare to common; 56° N. 23° W. to 53° N, 51° 



W., common at 33°— 40° W. 

 October: 56° N. 23° W., rare; 53° N. 31° W., not rare. 

 Xoveinber: 52°— 48° N. 48°— 46° W., rare. 



Temperature: 12, mean of 38 obs.; max. 26, min. 3.5 (only 

 such samples considered as contained this species abundantly). 



Salinity: 34.79, mean of 38 obs., max. 36.3?, min. 32. ni. 



Plankton-type: This species is found in the Pacific and in the 

 Mediterranean. It appeared in January 1898 in the S. Equatorial 

 Current and followed it to the .\. of S. America and into the Carib- 

 bean Sea. It was seen in December in the Brazil Current. In the 

 east xVtlantic it follows the African coast to the Canaries and the 

 Azores, whence it continues towards the Engl. Channel. In April and 

 May its area of distribution extended across the whole Atlantic be- 

 tween 40° and 50^ N. It had, already in May, advanced beyond 

 60° and reached Iceland in June. From S. Iceland it went towards 

 E. Greenland and was in October seen in Davis's Strait. On the 

 other hand it went from S. Iceland towards the Shetlands. It was 

 seen in September N, of Iceland and, already in August, at Spitz- 

 bergen. — .S. 



SKELETONEMA COSTATUM (Grev.).' 



(Van Heurc.k Syn. PI. XCI fig. 4—6). 



189S March: 'M N. 74° W. 



August: rare in the Irish Channel, at the Shetlands and at 

 Westmannao. 



Temperature: IO.2— 13,.^. 



Salinity: 34.0.^5 to 34.i(5. 



Plankton-type. Found in Jedo Bay, Japan, and in the Gulf 

 of Bengal. It is apparent from the above data, that this species, so 

 abundant near the coasts, is a neritic form. As it occurs in the 

 North Sea and Skagerak together with northern species it is to be 

 considered as belonging to As. 



' Ostenteld's data used. 



