PARASITES OF FISHES OF THK WOODS HOLE REGION. 



, AlKih/linil J:,i/ 1,1 llii- ijiiiivii iif Crxlinl.s iniiilidiinl in llii.i nji'irl. 



417 



]. Seolex splicriial or subspliiTiciil with cup-liku botliria -J 



■2. Seolex of various shapes, but linhke 1 



JScolex simple 



i. 

 T:fttm. 



''•Iscolex with retractile appendages in tront ■ ■.■ ' 'iina-Mu. 



fPcolex mushroom shape without bothria ., l),.-^cm;-,,l,nUnn. 



IScolex provirtert with bothria - -.- • ■ • - -.■ ''• 



jBothriatwo D.bolhrm,,, 



I Bothria four - V 



. f Bothria united into a discoidal or subglobular mass '■ 



''•^Seolex subglobular with subglobular myzorhynchus Tiiloccphahun. 



J. IBothria imarmed - .^■ 



"■'( Bothria armed ,X' 



„ fBothria without auxiliary suckers ';,'■ 



IBothria with auxiliary suckers {"■ 



,., J Bothria wi th eosta.' :,,■ 



IBothria without costfo ■-: — i",;"- 



„ fSeolex with mvM.rhvnehus Mr^nabnlhvmm. 



11- Seolex without distinct mvzorhynehus - «/"»<*"" (.'""• 



, , Bothria in pair.*, fan shap'o. with frilled or lobed borders s,,,moiohMmun. 



!-• Bothria cruciform with entire marsins • • ■ • Anthobothnum. 



, , (Two auxiliary suckers o.> each hot hrinm ' Ormmatobothnum 



^■'iOne anxiliarv sucker on each bothnum . ii- 



(Auxiliary suckers rclnlively large, formed from anterior part of bothnum I-;. 



^''•'1 Auxiliary suckers suinll, circular .- ■ • ^^■ 



,„ I .Vuxiliar'v suckers entire, seolex with terminal haustellum - ■,- - - Mmwni{/ma. 



■'•'•I Auxiliary suckers hor.seshoe shape, anterior ends of bothna partly retractile C atyplrobollinimi. 



,p (Bothria ini)airs ^' 



IBothria cruciform ;-""/•' V'i :>'■" ' '■rh'.'/l' 



,- Seolex with terminal muscular disk -V'" (e^Mrp'omT,,-fi,h. 



>'■ Seolex witlioullenniual muscular disk PhiiWMhTwm. 



, Bothria slender pclicclh.l. with crenulate borders Autlwcrpmlum. 



''■■ 1 Bothria .-hortiic'licellrd, border not crenulate CmmibMinum. 



,(, (Bothria armcl Willi hooks.... ...,. ■■ - ^• 



I Bothria r.rnvidcd with retractile spiny proboscides •.■ - • • - ^■'■ 



„ (H. .. .k-- inc. .uspicuous, of densely fibrous structure rinjmvocephalum 



I Hooks cli i liiions, stnict ureless ^•■ 



.,j I Hook s si in 1 .Ic 23' 



"J&'.tilriawSKnliuxiliarysiu-^^^^ '^";;'w"»!S™ 



--■I Bothna with auxiliary suckers, anterior to hooks ... - ^S, ,[,,?'< Z' 



.,„ (Seolex flattened, bothria in pairs, hooks in pairs united by a ehitinous bar Plnlybntki mm. 



f Hoo\" w^t\i twoTrongs eachVbothVik' ^ ! ! ! 1 ! ! ! ! ! '. ! ! ! '. '. ! ! ! ! ! ! ! '. ! ! ! ! ^ Acaiit'lwbothHum. 



24 



Hooks with three prongs each, bothria loculate at posterior end PhnrrhbiMrmm 



.,- (Bothria two :....:. ■' .T'lk 



„,. fBothria ca'AVwiVh an ^iuxiViiiry pit '.!'.'. '.!!"; Otobothrmm. 



-"• IBothria without an auxiliary pit Tri'mVliiiii-hZ-,' 



.,_ (Bothria lateral l,tnuluiV(lni.y 



"'"'(Bothria terminal 



.Si/itbntltriuvi. 



Aiiiihiliciil kill I'l III' llixliiiiiii iiiiiilhmid in lliis nporl. 



Bodv unarmed ' „' 



Body armed with spines TohrH i' 



I With a more or less retractile caudal ai>|>endagc """= '• 



^'l Without a retractile <'audal appendage .■ - ■ ■ ■ '" 



(Sexesscpiiralr, .-c ,' iiisiumiiiii (;ui«ily,TKi) .sp. from cysts in .ScomdtTOT/iorHs wmciitoiHs. 



'•^•1 Sexes 11 uii'^i. Ih niiapliroditic .■•-■■ ■'■ 



o (Head iirovi'lr.l »iili lobes (iiii/wicra). iii:K IHsUimmii aimmUatum. 



^■IHeail wilhout lobes ■T.'.hVeTv' 



, (Forks of intestine wi til lateral folds la- br-aiiches i.unn iv, 



■'•I Forks of intestine simple Table Tl' 



.(ffisophasus none or very short ;;;;;.; .:V T^Selli: 



lU'.-sopnagusillstnict Tnblc V 



(Month armcl with s|unes ^'^""^ V 



(Mouth unarmed 



liMOIllll UM;ni[icii .- Table VI 



(Forks of intestine simple, testes normally tw-fi - - ■ ■•■ .. xauii. ■■ 



7. Eac'h fork, with an anteriorly directed branch from near base of u!.sophagus, testes numerous^[7*OTc/.t]^^^^^^^^^^^^ 



iThe species referred in early papers to Onigmiilnbolhrium nimmliim has been placed in this iiaper in the genus 

 ( 'i-usst/bnthrinm. 



F. C. B. isaa— 27 



