CRUSTACEA MALACOSTRACA. II. 



20. Paratanais Batei G. O. Sars. 



1884. Paratanais Batei G. O. Sars, Arch, for Math, og Nattirv. B. 7, p. 32. 

 ! 1896. Account Crust. Norw. Vol. II, p. 16, PL VII. 



Occurrence. This well-known species has not been taken by the "Ingolf, but by two tra- 

 velling Zoologists. 



South of Iceland: Vestmannaeyjar, the littoral belt, Aug. 21, 1899; i spec. Mag. B. Ssemundsen. 



The Faeroes: Vestmanhavn, 10 30 fan., June 2, 1899; i spec. Dr. Th. Mortensen. 



Distribution. P. Batei has been taken "in several places on the west coast of Norway, in 

 comparatively shallow water among the roots of Laminariae" (G. O. Sars). Furthermore it is known 

 from some places on both sides of Scotland (T. Scott), from Falmouth and Plymouth (A. M. Norman), 

 Galway Bay in Ireland, 515 fm. (Tattersall), the Channel Islands (various authors), Saint-Jan-de-Luz 

 in S. W. France, 2'/ 2 fm. (Dollfus), finally from the Mediterranean at Spezia, 6 10 fm. (G. O. Sarsj 

 and the Gulf of Naples, i i'/ 2 fan. (G. Smith). 



P. Batei is decidedly a shallow water species, and its occurrence near South Iceland is of interest, 

 as some other Crustacea from the Lusitanican area also occur there and have their limit of distri- 

 bution in north-western direction at that coast 



Typhlotanais G. o. Sars. 



This genus hitherto comprised sixteen species, of which nine are known from Norway. The 

 "Ingolf material comprises nineteen species, but sixteen of these are new, while three are dealt with 

 in the work of Sars. The sixteen new species were all taken in depths ranging from 293 to 1870 

 fathoms, and the majority exclusively in depths from 690 to 1870 fathoms, but even eleven of these 

 species were captured only at a single station and seven among them I establish on a single spe- 

 cimen. Judging from these facts I am tolerably sure that several and probably numerous species of 

 this genus living in the area explored by the "Ingolf are still undiscovered, furthermore that the 

 depths of the oceans, from about 400 to at least 2000 fathoms, must contain a very large number of 

 species of this genus. 



Sars has published a good description of the genus according to the species seen by him. But 

 some of my new species differ conspicuously from that description in a few points. Thus, some species 

 have the lateral margins of the thoracic segments very angular, while Sars said that the lateral con- 

 tours of the body are almost straight; T.macrocephala has the cephalothorax extremely large, the an- 

 tennulse much thicker and the chelae broader than allowable according to Sars' diagnosis. But I have 

 found it impossible not only to separate a single form or some species as a new genus, but even to 

 divide my nineteen species into moderately well separated groups, because the characteis are inter- 

 mingled in such a way and so gradually developed in various species, that no natural division of any 

 value could be discovered. 



The scantiness of my material of the majority of the new species rendered it impossible to 

 examine their mouth-parts. But I have examined these parts of one of the species most aberrant 

 from the forms studied by Sars, viz. T. irregularis n. sp., and found that they differed so little from 



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