bio Recent Literature. LOct. 



Van Cleave's "Acanthocephala of the Canadian Arctic Expedi- 

 tion, 1913-1918." 1 — In his paper Dr. Van Cleave states that so far as 

 he is aware there are no published records of the occurrence of Acantho- 

 cephala in the arctic fauna of North America. "Species described by 

 some of the early explorers have become the objects of much conjecture 

 on the part of present-day investigators. Under the name Sipunculus 

 lendix, Phipps (1774) described from an Eider Duck what is obviously a 

 species of Acanthocephala. Soon afterward, Goeza (1782: 141) called 

 attention to the fact that this species of Phipps is in reality an acantho- 

 cephalan. Since that time various investigators have endeavored to 

 determine the correct disposition of this species within the group, but all 

 of their attempts appear to be mere guesses ostensibly fostered by the 

 desire to distribute all of the species names into groups which would at 

 least give the appearance of a completely worked out synonymy. . . . 



"Three species of fresh-water fishes, two marine fishes, and one bird 

 constitute the entire list of acanthocephalan hosts recorded by the expe- 

 dition. ... A new species of the genus Filicollis [Filicollis arcticus 

 Van Cleave, type host, King Eider, Somateria spectabilis (Linnaeus), in 

 intestine, collected at Bernard harbour, Dolphin and Union strait, North- 

 west Territories, June 16, 1916; cotypes deposited in the Victoria Memor- 

 ial Museum, Ottawa, Canada, and in the collection of the author at 

 Urbana, Illinois] from the King Eider stands intermediate between the 

 European and the North American species of this genus, but in some 

 respects shows much closer relationship with the previously described 

 American species. ... A comparison of F. arcticus with other 

 known members of the same genus discloses some interesting facts re- 

 garding the geographical distribution of the members of this genus. F. 

 anatis is the common European representative of Filicollis while F. botulus 

 occurs in the Eiders in the United States. Filicollis arcticus, n. sp., dif- 

 fers in definite manner from both the previously mentioned species but 

 shows a distinctly closer relationship to F. botulus. ... In F. bo- 

 tulus there are but sixteen longitudinal rows of hooks (on the proboscis) 

 while for F. arcticus the writer has found twenty-two. Both of these 

 American species lack the spherical enlargement of the proboscis char- 

 acteristic of the European species. 



"The King Eider, the host of F. arcticus, though circumpolar in its 

 distribution, evidently does not carry the same acanthocephalan infesta- 

 tion throughout its range. From the West Tajmirland peninsula, von 

 Linstow (1905: 3). |Helminthen der Russischen Polar-Expedition 1900- 

 1903. Mem. Acad. Imp. Sc. St. Petersbourge, Serie 8, Class Physico- 

 Math., 18: 1-17] described Echinorhynchus pupa from this same host 



i Report of the Canadian Arctic Expedition, 1913-18, Vol. IX: Annelids, 

 Parasitic Worms, Protozoans, etc. Part E: Acanthocephala. By H. J. Van- 

 Cleave. Southern Party — 1913-16. Ottawa: J. de Labroquerie Tache, Printer 

 to the King's Most Excellent Majesty. 1920. Issued April 7, 1920. pp. 1-11C. 



