BRITISH MARINE TURBELLARIA. 261 



(51) 1879. Levinsen, G-. M. E.— " Bidrag til Kundskab om Groenlands Tur- 



bellarie-fauna," 'Vidensk. Meddel. fra. den naturh. Foren. i Kjoben- 

 havn ' (separate copy cited). 



(52) 1880. Czerniavsky, V. — " Materialta ad geographiam ponticam com- 



paratain," fasc. iii, Vermes, ' Bull. Soc. Imp. d. Natur. d. Moscow,' t. lv. 



(53) 1882. Graff, Ludwig t. — ' Monographic d. Turbellarien : I. Rhabdo- 



coelida.' 



(54) 1884.— Lang, A,— "Die Polycladen," 'Fauna u. Flora d. Golfes v. 



NeapeL' 



(55) 1886. Koehler, R. — " Contributions to the Study of tbe Littoral Fauna 



of the Anglo-Norman Islands," 'Ann. and Mag. Nat. Hist.,' 5th ser., 

 vol, xviii (translated from 'Ann. Sci. Nat.,' 6me ser., t. xx). 



(56) 1891. Graff, Ludwig v. — 'Die Organisation d. Turbellaria Accela,' 



Leipzig. 



(57) 1891. Bohmig, L. — " Untersuchungen ii. rhabdocole Turbellarien," 'Zeit. 



f. wiss. Zool,,' Bd. ii. 



DESCRIPTION OF THE FIGURES ON PLATES X, XT, k XII. 



Illustrating Mr. F. W. Gamble's paper on " Contributions to a 



Knowledge of British Marine Turbellaria." 



PI. X represents the living animals, Pis. XI and XII compression- and other 

 preparations. 



Alphabetical List of Reference Letters for all the Figures. 



B. C. Bursa copulatrix. BR. Brain. BS. Spermotheca. CH. Ohitinous 

 portion of copulatory organ. CI. Cilia. COP. Copulatory organ. D. In- 

 testine. DO. Yitelfarium. E. Eye. EI. Ovum. EL. Flagella. GER. 

 Germarmm. GO. External genital aperture. KD. Granule-gland. L. Lens 

 of eye. M. Mouth. ME. Muscular envelope. MR. Mucous-rods. N. 

 Nucleus of epidermal cells. OT. Otolith. PA. Packets of rhabdites. PE. 

 Penis. PH. Pharynx. RH. Rhabdites. RS. Receptaculum seminis. SE. 

 Spermatozoa. SP. Pharyngeal glands. TE. Testis. V.D. Vasa deferentia. 

 VG. Vesicula granulorum. VS. Vesicula seminalis. W. Ciliated groove. 



PLATE X. 



Fig. 1. — Young Stylostomum variabile, Lang. Natural length 9 mm. The 

 three pairs of eyes placed over the brain are very conspicuous, and persist in 

 the adult (see p. 249), x 65. 



Fig. 2. — Cycloporus papillosus, var. Icevigatus, Lang. Natural size. This 

 form exhibits almost complete similarity in colour, form, and consistency 

 with the Ascidians on which it is usually found. 



Fig. 3. — Oligoclaclus sanguinolentus, Quatref. Length LI cm. x 6. 



