384 
EDWIN LINTON 
BIBLIOGRAPHY 
The literature of the Turbellaria is very extensive. Following are a few refer- 
ences of especial value in the study of such forms as Graffilla: 
Ihering. 1880 Graffilla muricola, eine parasitische Rhabdocoele. Zeit. f. wiss. 
Zool., 34, 147-174, Taf. 7. 
Lang. 1881 Notiz fiber einen neuen Parasiten der Tethys aus der Abtheilung 
der rhabdocoelen Turbellarien. Mitth. aus d. Zool. Sta. in Neapel, 
Band 2, 107-112, Taf. 7. 
Von Graff. 1882 Monographic der Turbellarien. I Rhabdoccelida. 
BoHMiG. 1886 Untersuchungen liber rhabdocole Turbellarien. Zeit. f. wiss. 
Zool., 41. 220-328, Taf. 11, 12. 
Luther. 1904 Die Eumesostominen. Zeit. f. wiss. Zool., 76, 1-273, Taf. 
i-ix. Bibliog. 259-263. 
NicoLL. 1906 Notes on Trematode parasites of the cockle (Cardium edule 
and mussel) (Mytilus edulis). Annals and Magazine of Natural 
History, series 7, vol. xvii, p. 154, plate 4, fig. 7. A form found in the 
cockle (Cardium edule) and identified as a sporocyst is very near, if not 
identical with this species. 
