142 Platelminthes. — Turbellaria. 



Habit. : Pontus P^uxinus: Sebastopol [Ul.janin].) 



2. Sul^fain. Proxenetina v. Gkakk. Orificiuni genitale singuluin, org-ana 

 ovo-vitellii^ena bina , bursa seniinalis niagna, testiculi parvi plerumque rotundati, 

 penis compositus. 



Proxenetes .Tknsex {Mesostomnm aut p.). Noiac suhfamiJiae ctiam ijf- 

 ncris suitf. 



1. Pr. gracilis v. Gk. Corpus 1,;") — ^2 mm longuni, gracile, teres, antice 

 truncatum, postice paullisper attenuatum, vitreum ; cutis sine colore; pars anterior 

 bacillis numerosissimis munita ; oculi duo ; extremitas caeca bursae seminalis ap- 

 pendice parva cliitinacea instructa, ductus ejusdeni sine partibus cliitinaceis ; penis 

 retortiforniis, magnus tubulosus. 



Distrib. : Ad insulam Madeira. 



Habit. : Napoli: Adria: Trieste, inter plantas marinas (v. Graff). 



2. Pr. sensitivus v. Gk. (Mpsostomum soisitivum Ul.i.). Corpus 1 mm 

 long'um, sine colore, antice attenuatum, postice late truncatum, p3'ritorme: oculi 

 duo nigri, series bacillorum ad eos, bacilli in corpore reliquo sparsi: pharj^nx 

 modicus ante corporis medium. 



I) i s t r i b. : Pontus Euxinus, Sebastopol. 



Habit.: ? ^lessina (v. Gkafk). 



m 3. Pr. ? chlorostictus v. Gk. {Mvsosfomum t chlorostictum O. Sch.m.). 

 €orpus fere 1 mm longum, antice rotundatum, post oculos latius, postice abrupte 

 attenuatum ; sine colore, sed corpusculis viridescentibus in cute confertis interdum 

 viridescens; oculorum paria duo; penis compositus. 



Habit.: Xapoli lO. Schjudt). 



*(4. Pr. ?striatusv. Gk. [Mcsostomum striatum Ulj.J. Corpus 0,') — (),74mm 

 longnm, pj^riforme, antice attenuatum ; bacilli seriebus obliquis dispositi ; oculi duo 

 nigri, lentibus magnis instructi. — Sebastopol [UljaninJ.) 



*(5. Pr.? echinatus v. Gr. {Mcsostomum ccliinafum Vh,i.]. Corpus 0,.")7 nnn 

 longum, teres, utraque extremitate h\te truncata, antice paullisper atteiniatum, 

 «ine colore; cutis bacillis prominentibus ; pharj^nx perparvus; penis parvus, apice 

 •duro uncinato, antrorsum directo. — Sebastopol [Ul.tanin].) 



3. Subfam. Eumesostomina v. Graff. Orificium genitale singulum, or- 

 ganum ovigenum singulum, organa vitelligena bina; bursa copulatrix et recepta- 

 ■culum seminis : testes elongati ; organum excretorium in bursain pharyngeam exiens. 



Mesostoma Dug. Ofnliflius )iullus; orciannm ci)pulatioiii.-< pro tnta sua huiffi- 

 tucline ad cduccHduui sci-rctum luasculum iiiserrieiis. 



Subgen. Opistopora v. Gk. Os et oriticium genitale in parte tertia poste- 

 riore corpoiis (aut os in secunda parte tertia); organa vitelligena laevia aut leviter 

 indentata : uterus simph-x, ovum singulum pro tempore recipiens. 



m 1. M. neapolitanum v. Gk. Corpus robustum teres, 0,') mni longum, 

 postice hite rotundatum, antice obtuse acuminato-attenuatum, sine coh)re, niveuni; 

 pharynx perparvus ante corporis medium situs; oculi minimi nigri; pars anterior 

 bacillis majoribus munita; oriticium genitale in parte postrema quinta corporis; 

 penis chitinaceus calcaratus. 



Habit. : Napoli (v. Graff). 



4. FauL PKOBOSCIDA J. V. Cks. Rhabdocoehi proboscide tactili instructa: 

 orificium genitale singulum aut diiplex ; organo ovigena et vitelligena discreta : 

 bursa seminalis; testis compactus; os ventrale, phar)nix plerumque rosulatus; in- 

 testinuni statu sexuali maturo non jam continuum; penis chitinaceus compositus. 



Subfam. Acrorhynchina v. Gk. Proboscis vagina in apice corporis aperta 



