1887.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 571 



where. The posterior aiitenuie are exceedingly large and prominent. 

 They are attached just within the front margin of the ccphah)thorax and 

 are generally directed more or less forward, as indicated in the two 

 general figures (Plato XXXIV, Figs. 1, 2). Their spread is usually a 

 little greater than the width of the cephalothorax,. The two pairs of 

 maxillipeds and the first i)air of feet project far beyond the margins on 

 either side, and are very conspicuous in dorsal view. The feet of the 

 second pair differ most widely from those of the female, as will be read- 

 ily observed on comparing Fig. 4 with Fig. 8, Plate XXXV. 



The color of this species is the same as that of L. Brevoortiw. Many 

 specimens were obtained, from the gills of bluefish {Pomatomus sal- 

 tator), caught in Vineyard Sound, jVIass., in 1883 and 1885, by the U. S. 

 Fish Commission, and this is the only host of the species so far as 

 known. A few males were occasionally found with the females, but, 

 though diligently searched for, the former sex has always been of rare 

 occurrence. The specimens are now contained in the National Museum, 

 and are catalogued as follows : Females, G02G, G050, 0050, G15G, 12G84 ; 

 males, C027, G051. 



