24 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



The type-specimen of A. cristata Stimpson is apparently no longer 

 in existence. I have made inquiry for it from the curator of the 

 museum of the Boston Society of Natural History, but I am in- 

 formed that it is not in that museum; that it was probably in Stimp- 

 son's own collection, and, if so, was probably destroyed when the 

 Chicago Academy of Sciences was burned in the great Chicago fire. 

 The specimens on which Liitken based his new species A. antillensis 

 are preserved in the Universitets Zoologiske Museum, Kjobenhavn. 

 I have recently examined two of them. They are typical American 

 specimens of A. cristata. 



Summary of the distribution of Arenicola cristata on American 

 shores. — A. cristata is found on the eastern coast of the United 

 States, from Woods Hole, Massachusetts, southward. It extends 

 along the western coast of Florida to Pensacola; it is also recorded 

 from Bermuda, Jamaica, Santa Cruz, and Curasao, and from two 

 stations, San Pedro and Monterey Bay, on the Californian coast. 



Further distribution. —NaTples, Suez,« Barrow Island (northwest 

 Australia), « Misaki (Japan). « 



ARENICOLA GLACIALIS Murdoch. 



This species was founded to contain specimens of Arenicola taken on 

 the International Polar Expedition to Point Barrow, Alaska. Mur- 

 doch ^ remarked that the worms in question are closely allied to 

 A. marina, but that they have only six setigerous segments anterior 

 to the gills and eleven branchiferous segments, instead of seven and 

 thirteen, respectively, as in A. marina. (He should have said six 

 and thirteen, for there are normally six anterior abranchiate seti- 

 gerous segments in A. marina.) He described each gill as a cluster 

 of about fifteen simple cirri and noted that the tail of each worm, 

 which forms about a third of the length, is without tubercles or 

 other appendages. Five specimens were picked up on the beach on 

 September 12 and 13, 1882, after a fresh westerly gale, and two 

 mutilated ones were obtained from the gullet of an eider duck which 

 had been diving on one of the sandy patches, in about 3 fathoms, 

 just above the station. 



There are no figures of this species, and the above constitutes the 

 whole of the information regarding it. Consequently the systematic 

 position of A. glacialis with regard to other species is in doubt, and 

 indeed its validity as a species has been questioned. In the number 

 of its anterior abranchiate segments and of its branchiferous seg- 

 ments this species agrees with A. cristata, and on this ground some 



o Unpublished records from the manuscript of the present writer. 

 & Report Intern. Polar Exped. to Point Barrow, Alaska, p. 155, Washington, 1885; 

 also in Proc. U. S. Nat. Mus., vol. 7, p. 522, Washington, 1885. 



