1,0.1302. AMERICAN PARASITIC AROULID^^WILSON. 707 



from Monimsha; an unnumbered lot off Cape Cod. From Sand Dab 

 {II!2>2><><jh)ssolde.H 2>latem>!((<'.s Fabricius), Nos. 1407 by V. N. Edwards; 

 an unnumbered lot b)^ Thompson from Woods Hole. From Sunnner 

 Flounder {Parallel dky a dentatm Linm\ius), Nos. 6067, 8688. From 

 Spotted Flounder {Lopliopsetta maoulata Mitchill), No. 6069. From 

 Sea Robin {Prlonotus carolinus Linnteus), Nos. 8275, 8639; oneummm- 

 bered lot })y Thompson. From Sculfjin {^fyoxocephaliM octodechn- 

 spiuoKws Mitchill), Nos. 8281, 12290. From Tomcod {Mlcrogadus 

 toiHCod Walbaum), No. 8280. From Goosetish {LopJiius pmcaUyrkis 



Linnaeus), No. , Woods Hole. From Minnow (sp.), No. 6105. 



From Flounder (sp.). No. 12297. From surface tow, No. 6179 (types); 

 one lot unnumbered, Woods Hole. No host given, two lots, August 13 

 and November 21, 1885, by V. N. Edwards. 



On examining this list and the one previously given for A. hdlcauda 

 it will be seen that both species infest fishes which live on or very near 

 the bottom. With the exception of those taken in the surface tow, 

 whose presence has alread}' been explained (p. 645), there is no devia- 

 tion from this rule. 



Hence, although the Arguli may and do change about quite freely 

 from fish to fish, especially during the breeding seasons, it would seem 

 as though they did not vary their level very much. 



And in a plankton distribution we might reasonably expect to find 

 at least these two species pretty definitelj^ located. The hosts of some 

 of the other species do not stay quite so closely at the same level, and 

 hence the range of the parasite would be enlarged by that of its host. 



Length, 6 mm.; length of carapace, 3.8 mm.; width of carapace, 

 3.5 mm.; length of abdomen, 2 mm.; breadth, 1.4 mm. 



Color in fresh specimens yellowish, with four delicate pale brown 

 longitudinal bands. The entire upper surface of the abdomen in ripe 

 females is a red lirown inclining to pink, thickly sprinkled with minute 

 black dots. The lateral flaps of the carapace are also ornamented with 

 an arborescent design in black pigment, similar to that shown in the 

 photograph of alosai (fig. 80). After death the females frequently 

 become a uniform bright pink. 



[jusyas — large, oip — eye.) 



ARGULUS ALOSiE Gould. 

 Plate XII; Plate XXVI, fig. 80. 



Argulus alosx Gould, Invertebrata of Massachusetts, 1841. — Thorell, Oin tvenna 

 Europeiske Argulider, etc., (Efvers. af Kongl. Vetensk.-Akad. Forhandlin- 

 gar, 21st series, Stockholm, 1864. — Smith, Invertebrate Animals of Vineyard 

 Sound, Report of U. S. Com. Fish and Fisheries, 1872. — Ratubcn, Annotated 

 List of Parasitic Copepods, Proc. U. S. National Museum, VII, 1884. 



Carapace elliptical, longer than wide; antero-lateral sinus shallow 

 but often becoming deep and sharp on shrinking in alcohol, so that 

 the cephalic area protrudes in a sort of semicircle. 



