CRU8TACKA MALACO8TRACA. III. % t 



133. Synidothea nodulosa Kroyer. 

 ! 18461 Idotkea nodulosa KrSyer, Naturh. Tidsskr. Ny Ra-kkc, VoL II, p. ioa 



Kroyer, in Gaimard, Voy. en Scand., Crust PL ad, figs, a a a v. 

 ! i88a Syttidotk* mimhsa Hargcr, Rep. U. S. Comm. Fish and Fisheries, Pt VI, p. 351 ; PL VI, fig*. 



' Richardson, Monograph, p. 388, figs. 4394301 



In the marsupium has been found the Kpicarid Clyfirotiiscus Mrinerti Giard & Bonn., to be 

 dealt with later on. 



Occurrence. This fine form has not been taken by the "IngolP. 



It has been captured three times at West Greenland, vit, at Godhavn, Lat 6o, 8 i4' N., 8 10 

 f.ith., saml: at Lat 6646' N., Long. 54io' W., 18 fath., stones with many Balani (H. J. Hansen), finally 

 at "Southern Greenland", 12 15 ** Mnd (Kroyer). 



Distribution. West Spitzbergen, 61 fath. (G.O.San) and 48 fath. (Ohlin); some places on 

 the west coast of Novaya Zemlya, from 36 to 5 ao fath. (Stuxberg); in Jugor Schar, 6 fath., and 

 5-8 fath. (Hansen, Stuxberg), and some places in the Kara Sea, 8 to n fath. (Stuxberg). Ohlin says 

 that it occurs in the sea north of Siberia, but I cannot find any positive locality recorded in the lite- 

 rature. It is unknown from Ellesmere Land and the west coast of Baffin Bay and Davis Strait, but 

 has been taken more southwards at Nova Scotia and George Banks, in 16, 18 and 190 fath. (Harger). 

 Finally it has been recorded from a place north of Queen Charlotte Island, British Columbia, in fath. 

 (S. I. Smith; Harger). 



S. nodulosa, which generally occurs in rather low water, has by Ohlin been considered as cir- 

 cumpolar. It may be so, but it is still extremely uncertain, as the statements above show that our 

 knowledge is still very imperfect 



Family Arcturidae. 



The material comprises three genera: Arcturus Latr., PUuroprion zur Strassen. and Astacilla 

 Cordiner. In these genera and probably in the whole family the first thoracic segment is immovably 

 coalesced with the head. - The maxillipeds of females with marsupium have their basal part altered 

 and expanded for producing a current of water; the structure of the maxillipeds in the male and the 

 adult female of Astacilla granulaia G. O. S. has been described above on p. 185. 



The number of marsupial plates has been used as generic characters by recent writers, but in 

 most cases the number stated by them is quite wrong. G. O. Sam Mid in the "Account" p. 88, that 

 Arcturus (most probably he had examined A. Ba/ftni) has three pairs of marsupial lamellae "issuing 

 from the and, 3rd and 4th segments", while Astacilla has only "a single pair" of lamella;, on fourth 

 segment Richardson gives the same numbers in the Monograph. Before quoting further statements 

 on Astacilla and closely allied genera it may be said, that in Arcturus Baffini I find five pain of 

 lamella: belonging to the five anterior pain of thoracic legs; fint pair are considerably smaller than 



