VOL. XXV. 



1}^ PROCEEDmnn of th e national WVflEVM. 



specie-s in these inland waters. It .stays within the gill cavity, and has 

 never jet been found upon the external surface, but there s every 

 reason to believe that at least the males con>e out upon the external 

 sur ace during the spawning season. The National Museum collection 

 contains specimens trom both the above localities and also a single 

 specimen a female, taken from carp at Fairburg, Illinois. ^L^ 

 of hese lots are numbered. In all probability future investigation 

 Stotet''"™ '"''■''''"" ™'*''° '"'*"'■' '°'""'"' ">« United 



(«,tosfom„ = generic name of its most common host, the sucker.) 



ARGULUS FUNDULI KrOyer. 



Plate XIV. 



Argulmfundull Mver, Natarhi.,t. TWsk. 3die Raekke, 2 Bind, 1868 -Thore, l 

 Om tvenna Europeiske A,^.,.lider, etc., (Efven,. af Kong . Vetatxk ..Had" 

 Forhandlmgar, 21et series, Stockliolm, 1864. 



Carapa^,e orbicular, broader than long; posteriorsinus less than one- 

 hfth the length ot the carapace, wider than deep, in the female nearlv 

 as two to one. Abdomen in the male fully one-half the length of th'e 

 res of the body nearly three times as long as wide, with a narrow 

 anal sinus less than a fourth of its length. Abdomen in the femalT 

 much smal er, less than a third the length of the carapace, threc-ht'ibs 

 as wide as long with a wide anal .sinus half it, length; papilhe ba.sal. 



1 he sucking d,sk.s are relatively the largestof any American species 

 beng almost oue-third the width of the carapace; posterior I'axilli- 



and blunt. Antenna, ot moderate size and fairly well armed The 

 whole ventral surface of the thorax roughened in the female 

 bwimnung legs long, reaching well beyond the edge of the carapace- 

 basal join s of the posterior legs in the femal,. with medium-sS' 



::ie:v.:::ii;::r '-"^^^ ''-"^ '*^ "■"'•" ''''"'^^' '■•»- '-^^ 



Eyes very large, fully ,he size, relatively, of those in „„g,dop.. 



nle!it»,:'th°" "T"' '"'■''"■'' °* ''"' "'-'"■'■ "'«' *^'^' -tber more 

 plentiful than in most species. No flagella 



Length of female 5 mm., of male's.S mm.; length of carap,ace 



mr>mn "",:•' "*/■,',"""•' '"-""'"^ °' -™pace,°female 3.5 Zl] 

 m.ale2im.; length of abdomen, femalel.l mm., male 1.2 mm.- width 

 female 0.6 mm., male 0.4 mm. ' ' 



Color of alcoholic specimens uniform yeJlowish-white. 



Ihis Argulus was obtained from the gills of a species of Fundulus 

 near New Orleans ,n 1882. KrOyer gave the fish the manuscript nam^ 

 ^««/« „, /.„7„,„.. which h,as been changed by Jordan and Gi bcrt to 

 ^ <«««™. But both Kroyer and Thorcll made ti serious mistake in 



