CRUSTACEA MALACOSTRACA. II. 23 



1899. T(7iiais Cavolinii A. M. Norman, Ann. Mag. Nat. Hi.st. Ser. 7, Vol. Ill, p. 332. 



1905. ^ — Harr. Richardson, Mon. Isop. Nortli America, Bnll. U. S. Nat. Mns. No. 54, p. 8. 



The tangled synonymy of this well-known species is fonnd in Norman's and Miss Richardson's 

 papers. 



Occnrrence. The "Ingolf" secnred this species at a single locality. 



Fseroes: Trangisvaag, between algae at the shore. Many specimens. 



In the paper on the Malacostraca from West Greenland I stated that a specimen with the 

 label: "Greenland, Kroyer's effects", was preserved in the Copenhagen Museum; for this reason I 

 mentioned the species, but did not number it, as I feared that the statement was not quite certain. 

 Nevertheless Norman and other authors have on rav authority included "Greenland" in the enumeration 

 of the distribution of the species. But as T. Cavolinii has not been found at Iceland and has not in 

 recent time been captured at Greenland I am now nearly sure that the species does not live at the 

 last-named country. 



Distribution. This species is known from Gresund (Kroyer), the western coast of Norway 

 northwards to Lat. 63° 20' N. (G. O. Sars), Scotland northwards ab. to Lat. 5672 N. (Norman), Eng- 

 land and Ireland (several authors), the Channel Islands (various authors). West France (Chevreux), 

 many places in the western half of the Mediterranean (several authors), Azores (Barrois); finally 

 Connecticut, Long Island Sound and Castle Harbour, Bermudas (H. Richardson). It lives always in 

 quite shallow water, from the beach down to a few fathoms. 



'' Pseudotanais G. o. s. 



Of this genus five valid species have been established; four of these are boreal or arctic, while 

 the fifth species is only known from the Mediterranean. The "Ingolf" captured six species, three of 

 which are new. 



This genus differs materially from all other genera by having fifth and sixth thoracic segments 

 very long as compared with the fourth segment and especially with third and second segments. It 

 is placed here because in some other features it is intermediate between Tanais and Parafaiiais — 

 Typlilotanais. It agrees with Tanais and differs from the other genera in possessing only a single 

 pair of marsupial lamellae; as to antennulK, antennae, uropods and development of second pair of legs 

 as compared with the following pair it agrees on the whole with Paratanais— Typlilotanais ; as to the 

 mouth-parts — mandibles and maxillipeds — it differs strongly from the genera named and is more 

 related to LcptognatJiia, though showing pecuHarities not found in the last-named genus. 



14. Pseudotanais forcipatus lyilljeborg. 

 (PL II, figs. 3 a— 3 e). 



1864. Tanais forcipatus Lilljeborg, Bidrag till kannedomen om de inom Sverige och Norrige 



forek. Crust, of Tanaidernas familj., p. 16 (Female and Male). 



! 1897. Pseudotanais forcipatus G. O. Sars, Account Crust. Norw., Vol. II, p. 40; PI. XVII, fig. i (Female 



and subadult Male). 



