rjrj_| Dritter Abschnitt. Systematik. 



dorsal wärts wulstfürmig verdickt. Zahlreiche Paare von Darmastwurzeln. 

 Darmäste anastomosirend. Uterusdrüsen der Zahl nach ungefähr den Darm- 

 astwurzelu entsprechend. Männlicher Begattungsapparat unmittelbar hinter 

 der Pharyngealtasche. Tentakeln wohl entwickelt, ziemlich spitz, werden 

 beim Kriechen des Thieres in zierlicher Weise hin und her bewegt. Gehirn- 

 hofaugen nicht über den Gehirnhof hinausragend, sondern wie bei den Pseudo- 

 ceriden zu zwei sehr genäherten kleinen Gruppen zusammengedrängt. Auf- 

 fallend gezeichnete Formen. Die Färbung rührt meistens von Parenchympig- 

 ment her. 



141. Prostlieceraeus (Schmarda) vittatus (Montagu) mihi. 

 Taf. 7. Fig. 6. 



Planaria vittata'j, Montagu IS 15. 13. pag. 25 — 26. Tab. V. Fig. 3. — de Blainville 

 1826. 22. pag. 217. — yinoMPSoN 1840. 35. pag. 247—248. — Johnston 1845. 45. pag. 436. 

 — ^) Thompson 1846. 49. pag. 392. 393. — ^j Harvey 1854. 77. pag. 157—158. 1 Holzschnitt 

 im Text.i 



Proceros cristatus^), Qliatrefages 1845. 43. pag. 139. Tab. 3. Fig. 7. — ^) Thompson 

 1846. 49. pag. 392—393. — Diesing 1862. 89. pag. 546—547. 



Eurylepta cristata, Diesing 1850. 56. pag. 210. — Selenka 1881. 141 (Ontog). — 1881. 

 143 (Ontog.). — ') 1881. 144. Tab. VIII (Ontog.). 



Eurylepta vittata, Diesing 1850. 56. pag. 209. — Schmarda 1859. 82. pag. 26. — 

 Diesing 1862. 89. pag. 548. — •^) Johnston 1865. 96. pag. 8. — ') Jensen 1878. 131. 

 pag. 78 — 79. 



Prostlieceraeus cristatus, Schmarda 1859. 82. pag. 30 Anmerk. 



1 »Body ovate, yellow, the margiu edged with white, and marked with concentric, broken lines of 

 black ; in the middle a broad white longitudinal line, with a central black one : in the front are two auii- 

 cular appendages, each marked with a black patch on the hinder part: at a small distance behind the 

 auricles, at the commencement of the dorsal white line, are two contiguous patches consisting of numeroiis 

 rainute black spots, appearing perfectly distiuct under a lens, aud wliich are probably eyes. The white 

 part in the middle is somewhat convex, and seems to be what contains the viscera; the rest is extremely 

 thin. Length when extended an inch and a half; breadth one inch. This extremely beautiful marine Pla- 

 naria lias a slow and gliding motion, the margins undulating into raised scallops. Two were taken by 

 accident amongst Spongia tubulosa at the Salt-stone in the estuary of Kingsbridge, in the montli of August, 

 and fortunately a drawiug was taken the same day. for on the uext morning not a vestige remained of 

 them, although placed in a glass of sea water; they were completely decomposed and turned into a 

 milky fluid.« 



2) i>A singlc individual Mas taken by Mr. IIynuman and myself when dredging in .Strangford lougli 

 on the l*' of October — in size it exceeded Moxtagi:'s, being 2 inches in length and one in breadth. It 

 was of a whitish cream colour with black lines, occasionally broken or nou-continuous, disposed longitudi- 

 nally over the upper surface of the body, not unlike those which on a whiter ground render so attractive 

 the plumage of the male silver pheasaut; these lines are froin the delicacy of the animal all visible when 

 the under side — which in itself is piain white — is next the spectator; it was surroiiiided by a border of 



