j88 CRUSTACEA MALACOSTRACA. III. 



The description given by Pallas leaves no doubt as to the species examined. The largest spec- 

 imen from our area seen by me is a male from Reykjavik, and it is 36-5 mm. long, but an old Kroyerian 

 specimen from Northern Norway is 41-5 mm. 



Occurrence. Taken by the "Ingolf" both at the northern and the southern part of the west 

 coast of Iceland, viz., in Dyre Fjord and at Reykjavik. 



This species does not occur at Greenland. It has never been taken at the north, east and 

 south coasts of Iceland, but several times along the whole west coast, viz. in Hofn Bay, Adelvik, 

 Skutils Fjord, 0nundar Fjord, Faxe Fjord and at Reykjavik, from the beach down to 10— 11 fath. 

 (various collectors). It is very common at the Fseroes, where it has been taken in Trangisvaag, Kalbak 

 Fjord, Kvannesund, at Thorshavn, Vestmanhavn, etc. 



Distribution. This species is known from the Baltic, going to near Stockholm's skargard 

 and the coast of Finland, from the Sound, the Danish Belts and Kattegat, along Norway at least to 

 Tromso, in the North Sea on floating wood or alga; (Zirwas), at Holland, Great Britain and Ireland, 

 Northern and Western France, the Mediterranean and the Black Sea (many authors), besides west of 

 El Araish, Morocco (Copenhagen Museum). In the West Atlantic it is recorded as occurring from the 

 Gulf of St. Lawrence and Nova Scotia to North Carolina, and, besides, at Bermudas and Barbadoes 

 (Richardson). But when Richardson furthermore enumerated it from Desterro and Rio de Janeiro, from 

 New Zealand, the Red Sea and Java, I think that at least most of, and probably all, these statements 

 are incorrect; in Miers' monograph of the family (1883) I find all these localities enumerated for his 

 / marina L,., which renders Richardson's copying them worse than valueless, as Miers under the name 

 I. marina had mixed up at least four and probably five or six species. The same authoress also said 

 the depth to be from the "surface to 119 fathoms", but the latter statement is certainly misleading, 

 being due to the fact that the animals, which can swim rather well and frequently live among floating 

 algae, have been taken in the instrument when it was hauled up. 



129. Idothea granulosa Rathke. 



1843. Idothea granulosa Rathke, Nova Acta Acad. Cses. Leop. Cur. XX, p. 23. 



1895. Idotea marina Dollfus, 1. c. p. 7, fig. 22. 



! 1897. Idothea granulosa G. O. Sars, Account, II, p. 82; PI. 34, fig. 1. 

 ! — — neglecta G. O. Sars, 1. c. p. 84; PI. 35, fig. 1. 



Both Norman and Tattersall have followed Sars in keeping / neglecta as a species separate 

 from I. granulosa, but after prolonged examinations of my rich material, which even comprises co-types 

 of both forms presented by Sars, I must consider them as varieties of the same species, which is very 

 variable in the shape of abdomen, in granulation, in the length of appendix masculina in large spec- 

 imens, in colour, etc., so that I have been quite unable to refer my specimens to two species. From 

 the Fseroes my largest male is 27-2 mm. long; its abdomen is shaped as in /. neglecta Sars, its surface 

 is smooth, but the appendix masculina is longer than according to Sars, being as long as in his figure 

 of /. emarginata. Another male is 24-5 mm. long, the shape of abdomen intermediate between /. gra- 

 nulosa and /. neglecta as figured by Sars, the surface smooth excepting on the epimera and the most 



