MARINE ISOPODA OF NEW ENGLAND, ETC. 423 



1865 among Zosterce between tide marks in Belgrave Bay, Guernsey," 

 and in the description of Paratanais forcipatm, on p. 139, mention in 

 afoot-note a specimen from the same locality, "which has a pair of six- 

 jointed anal filaments with a short one-jointed secondary filament arising 

 from the extremity of the basal joint. Can this be the female of 

 Leptocliclia Edwardsii fully grown?" 



Through the kindness of the Bev. Mr. Norman I have been able to 

 examine a specimen labeled " Leptochelia Edwardsii, Guernsey, I860," 

 and do not find that it differs from our species in any characters that 

 can be regarded as of specific value. The antennulte have indeed only 

 seven flagellar segments, or ten segments in all, which is also the case 

 in some of our specimens, though eight such segments eleven in all is 

 the usual number. The thoracic segments have the same proportion to 

 each other as in our species, and the uropods agree exactly with ours 

 in being biramous, with the outer ramus short and uniarticulate and 

 the inner ramus six-jointed. 



This is the form of uropod described and figured by Kroyer in Tanais 

 Savignyij which, as Fritz Miiller has suggested, is probably the female 

 of T. Edwardsii Kr. That species has, however, according to Kroyer, 

 a five-jointed antennula, the last segment being rudimentary. I have 

 observed among a large number of our specimens two which had the last 

 segment divided, though scarcely longer than in the others. These speci- 

 mens could hardly be distinguished from T. Savlgnyi Kroyer by any 

 characters that I have observed. In view, however, of the great simi- 

 larity of the females throughout the genus, as exemplified in the females 

 of this species and of L. rapax, with both sexes of which I am familiar, 

 I have concluded for the present to retain the specific name which I re- 

 cently proposed for this species, and wait until an examination of both 

 sexes can be had to decide the questions of specific identity. 



I formerly regarded this species as identical with Tanais filum Stirnp- 

 son, and supposed its range to extend to the Bay of Fundy. In view 

 of the number of species now known to exist on this coast, and in the 

 absence of any specimens from the Bay of Fundy, I now regard that as 

 an error, and have corrected it in the American Journal of Science. 



This species is rather abundant among eel-grass (Zostera marina} and 

 algse at Noank ! awl Wood's Holl !, and has been taken during the past 

 summer (1879) at Provincetown ! , Mass., among eel-grass, on a vessel's 

 bottom and in old piles, in company with Chelura terebrans Philippi 

 and Limnoria lignorum White. The specimen sent by the Eev. A. M. 

 Norman enables me to extend its range to the Island of Guernsey ! , in 

 the British Channel. 



