46 
30 and 230 m below the surface; but it may be found, in smaller 
numbers, above as well as below these limits; in the uppermost 
water layers mostly young individuals are found. — In the San 
Diego region it is typically mesoplanktonic; it may be found oc- 
cassionally above 100 fms., but never above 25 fms. (Michael 
1911). — Ritter-Zåhony arrives at the conclusion that Eu- 
krohnia hamata is found everywhere when the temperature is 
below a certain limit (13—16? C). The following pages will prove, 
that the facts are not quite so plain. 
The species is very numerous in the northern part of the At- 
lantic ocean whence it spreads through the Davis Strait far north- 
wards into the Baffin Bay (at least to Lat. 74Y N, according to 
Aurivillius 1896), while east of Greenland the region of distri- 
bution extends all over the Norwegian Sea-and the Polar Sea to 
Spitzbergen. Near to the Norwegian coast it is abundant in the 
deeper strata and penetrates into the deeper parts of the Skager- 
rak and Kristiania Fjord (Broch 1906). It does not occur in the 
shallow parts of the North Sea (Apstein 1911, p. 174). AC 
cording to Fowler (1896) it is seldom wanting in any haul 
made in the Faeroe Channel. 
Interesting details as to the distribution of the species in the 
north-atlantic region might have been given by Ritter-Zåhony 
who was commissioned to work up the large material of chaeto- 
gnaths collected by the Danish expeditions with the "Ingolf" (1895 
—1896) and the "Thor" (1904—1907). But the publication (1914) 
which was the result of his labour only occupies 1'/2 (one and a 
half) pages and a list of the hauls (two pages). As a matter of 
fact, our knowledge to the north-atlantic distribution of the chaeto- 
gnaths was rather deficient, until the said collections could be 
worked up, and it is a pity, that Ritter-Zåhony has not paid 
more attention to the valuable material. 
If we look at Fowler's map of the atlantic distribution of 
Eukrohnia hamata (1906) and add the places, where the species 
has been found later on, particularly by the expeditions of the 
"Ingolff and the "Thor", we will find that the species is completely 
absent from the Faeroe plateau and the Wyville Thomson ridge 
with exception of a few places near the 200 m line along the 
south-east coast of Iceland where some specimens have been cap- 
