Aphanostomidae. — Mesostomidae. 141 



*(1. M. ornatum Ul.i. Corpus cylindratum, pelluceus, autice et postice 

 rotuudatuui: organa urticautia uulla; bacilli in parte anteriore in foveis elongatis 

 teuuibus longe prouiinentes; setae uullae; sine colore, iutestiuum fuscuui. 



Habit. : Sebastopol, iuter plantas marinas [Uljanin].) 



>n 2. M. rubromaculatum v. Graff. Cutis sine colore, pellucens, inte- 

 stiniuu colore riavido-iubro trauslucens; ocelli maculas duas annulum formantes 

 referunt; pliarynx ovatus aut semiglobosus; pars posterior corporis papillis adhae- 

 sivis muuita; bacilli nulli; cellulae urticautes ('?). 



Habit.: Xapuli, siuus, in Lomentaria kaliformi (v. Graff). 



Stenostoma (). Schm. Sexus discrefi, testiculi compacti; corxnis aequalitcr 

 ciliis ofjtcctuin. forcofis rifjrantifjus; caccum praeocsopliacieum nuJflum. 



in 1. St. Sieboldii v. Graff. Siue colore, 1,5 — 2 nim louguui; os paullo 

 post extremitatem anteriorem corporis situm, paullo post foveolas vibrantes; 

 pharyux Iiemisphaericus, g-Iaudulis salivalibus uuicellularibus instructus; oculi mUIi;, 

 cutis corpusculis bacilliformibus orgauisque urticantibus instructa. 



Habit.: Trieste, portus, iu Ulvis (v. Gtraff). 



3. Fam. MESOSTOMIDAE Dug. Oriticia genitalia singula aut bina; orgaua 

 ovo-vitelligeua aut ovigeua et vitelligena discreta, pleruuuiue orgaua accessoria 

 feminea; testiculi pares compacti; pharyux veutralis rosulatus. 



1. Subfam. Promesostomina v. Graff. Oriticium genitale singulum, or- 

 gana ovigena bina et vitelligeua bina, organa accessoria § nulla; testiculi parvi 

 rotundi. 



Promesostoma v. Ctraff {2Iesostomum aut p., JDiopis et Turheffa Dies p., 

 Tamara Ul.j.). Xofae suf/famifiae ctiam generis suiit. 



1. Pr. marmoratum v. Ctraff {Mesostomum marmoratum M. Sch. , Tur- 

 beffa nigrovenosa, T. fjoreafis Dies.). Corpus V2 — 2 mm longum, antice late rotun- 

 datum, postice attenuato rotundatum, supra couvexum, subtus plauum, in funda 

 flavido-fusco pigmentum nigrofuscum reticulatim dispositum, rarius uullum; pars 

 anterior bacillis, postica cellulis agglutinantibus munita; organum copulatorium 

 longum tubulosum, longitudine autem variabili, apice modo recto, modo curvato 

 aut spiraliter coutorto. 



Distrib.: Mare Atlanticum, Groenlandia, Scotia, Belgium; mare Balticum; 

 Pontus Euxinus. 



Habit. : Messina, Napoli (v. Graff); Adria: Trieste (v. Graff). 



2. Pr. ovoideum v. Graff (Mcsostomum ocoidcum 0. Schm. , Turbelfa 

 ovoicfca DiES.). Corpus 0,5^ — 0,7 mm lougum, late ovatum, antice rotundatuniy 

 postice attenuatum; cutis sine colore, bacillis et pigmento nigro reticulato munita; 

 oculi cyathi simplicis formam referunt; peuis pyriformis, parvus. 



Distrib. : Grroenlandia. 



Habit. : Messina, Napoli (v. Graff); Adria: Lesiua (0. Schmidt). 



3. Pr. solea v. (traff {Mesostomum sofea 0. Schm., Turhelfa sofea Dies., 

 Mesostoinum ovoideum Ulj., nec Schm.). Differt a Pr. ovoideo pigmento reticulato 

 magis sparso et oculis in facie concava pedunculo brevi nnmitis. 



D i s t r i b. : Pontus Euxiuus. 



Habit. : Napoli (0. Schmidt), Messina (v. Ctraff). 



*(4. Pr. ellipticum v. Graff [Mesostomum effipticum Ulj.]. Sine pig- 

 niento nigro reticulato, prorsus laete flavidum. 



Habit. : Poutus Euxinus: Sebastopol [Uljanin].) 



*(5. Pr. ? elongatulum v. Graff. Prorsus sine colore; oculi absque 

 leute; penis mollis; testiculi et organa vitelligena singula? 



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