!86 CRUSTACEA MALACOSTRACA. III. 



Family Idotheidae. 



Three well-known genera are represented in the material. 



Mesidothea Richardson. 



The name proposed by Harriet Richardson must, I think, be preferred, as the animals differ 

 materially both from Chiridothea Harg. and from the antarctic Glyptonotus Eights. Two species are 

 known from our area. 



126. Mesidothea Sabini Kroyer. 

 (PL XV, figs. 4 a 4 b). 



? 1846. Idothea Sabini Kroyer, in Gaimard, Voy. in Scand., Crust PI. 27, fig. i. 

 1847. Kroyer, Naturh. Tidsskr. Ny Rsekke, Vol. II, p. 394, 401. 



! 1882. Sabinei Stuxberg, Vega-Exped. Vetensk. lakttag. Vol. I, p. 716, with fig. 



! 1905. Mesidotea Sabini Richardson, Monograph, p. 350, figs. 377379. 



The maxillipeds of both sexes (figs. 43 and 4b) are described on p. 185. Some observations 

 on the moulting, etc., are found in my paper on the Crustacea from "Dijmphna-Togtet" (1887), and 

 Max Weber (1884) has studied the anatomy. 



The largest specimen recorded is a male, 98 mm. long, from Northern Stromfjord, West Green- 

 land (Stephensen). 



Occurrence. Not taken by the "Ingolf". Within the "Ingolf" area only known from West 

 Greenland, and recorded from the following localities: Lat. 76O9' N., 1725 fath. (Ohlin); Lat. 76O7' N., 

 512 fath. (H. J. Hansen); some places in the inner part of Northern Stromfjord, Lat 674o' N., in 

 depths from about 21 down to 173 fath., temp, from slightly above zero to -;- 1-5 (Stephensen); finally 

 Julianehaab, Lat 6o43 ( N. 



Distribution. This fine species has been taken at Ellesmere Land in Gaase Fjord, 1015 

 fath. (G. O. Sars), and at Cape Faraday, Lat 7738' N., 510 fath. (Ohlin), furthermore at four places 

 along the east coast of Arctic America from Lat. 7343' N. to Lat 6633' N., 510, 6 and 1015 fath. 

 (Ohlin); it is known from Melville Peninsula and a couple of places on the north coast of Alaska 

 (Richardson), perhaps also found at the west coast of North America (Miers). -- Sars recorded it from 

 a station between North-East Norway and East Spitsbergen: Lat. 7325' N., Long. 3iio' E., 197 fath., 

 temp. 2-2; furthermore it has, according to Ohlin, been taken in the Storfjord, Spitzbergen. It has 

 been taken several times in the Barents Sea in from 54 to 175 fath. (Hoek, Weber, Stebbing), was 

 secured between Novaya Zemlya and Franz Joseph Land (Heller), is common in the Kara Sea, 8 to 

 loo fath. (Stuxberg, Hansen), and more eastward in the Siberian Polar Sea to Long. I7OI7' E., 4 to 50 

 fath. (Stuxberg). But as it is unknown at East Greenland and Jan Mayen, in the most eastern part 

 of the sea north of Siberia, and at least the western part of the Bering Sea, it can scarcely be called 

 circumpolar. 



