2 DR. J. WILHELMI. 



fied as such and doubtless it does not belong to the genus Bdel- 

 lonra. Also I have published a paper ' on the larva; of 

 planarians, named by Agassiz^ Planaria angiilata and the prob- 

 able confusion of these with young Bdellouridse. The following 

 communication concerns only the free-living marine triclads. 



Girard^ described in 1850 a marine triclad, found near Man- 

 chester (Massachusetts Bay) under the name Proccrodcs whcat- 

 landi n, gen. n. sp. The same animal was found by Leidy (9) in 

 1855 near Point Judith, R. I., and was described as Procerodes 

 frequcns n. sp. Neither species was investigated in relation to the 

 genital apparatus and nevertheless Verrill (10), in 1873, identified 

 them with the North European species Gunda idvcB (Oe.).^ 

 Girard^ called the first species by its old name Procerodes wheat- 

 landi but the second and the third (European) species he classed 

 with the Rhabdocoelidze (!) under the name of Neoplana n. g. 

 frcqueiis and ^V. idvce. Curtis ' supposed that Verrill's Procerodes 

 ulvee [Procerodes ivlieatlandi -\- Procerodes frequejis) may be iden- 

 tical with the South European Procerodes {Gunda) scgmentata 

 (Lang). 



Without mentioning the mistake of Girard, there are two ques- 

 tions to answer : (i) Is Procerodes zvJieatlandi [Procerodes 

 frequens) identical with one of the European triclads Procerodes 

 ulv(B ox Procerodes segnioitata ? (2) Must the European genus 

 Gtinda O. Schm. (-1- Haga O. Schm.) be classed with the Ameri- 

 can genus Procerodes ? 



In relation to the last question Bergendal ^ correctly mentioned 

 that for the present the well-described genus Gunda must be pre- 

 ferred to the insufficiently described genus Procerodes. Bohmig^ 



1 Wilhelmi, J., '^^Xjhtx Planaria angulata Miiller," Zool. Jahrb., Abth. Sytem- 

 atik, 26. Bd., 1907, 10 pp., i Taf. 



2 Agassiz, A., "On the Young Stages of a Few Annelids," Ann. Sc. N. //., New 

 York, 8. Bd. , 1866, pp. 306-309, Taf. i, figs, i u. 2. 



^Oersted, A. S., " Forsog til en ny Classification of Planarierne (Planarica Duges) 

 etc.," Kroyers Naturh. Tidsskrift, IV., 1843, P- 55 '• 



* Bergendal, D., " Studier ufver Turbellarier. 2. (J)m Byggnaden af Uteriporns 

 Bgdl. jamte andra bidrag till Tricladernas anatomi." Fysiogr. Tdlhk Lund Handl. 

 (2), Bd. 7, 1896. — Ueber drei Tricladen aus Punta Arenas und umliegender Ge- 

 gend," Zool. Anz., 22. Bd., 1899. 



■'' Bohmig, L., " Turbellarienstudien : Tricladida maricola,'''' Zeitschrift f. u>iss. 

 Zool., 81. Bd., 1896. 



