HISTOLOGY OF THE LAND-PLAN AEIAN S OF CEYLON. 
115 
Fsanz Letdig Tom Bau des thierischen Korpers. Handbucli der vergleiclienden Anatomic, 
Band i. erste Halfte. 
Tafeln znr vergleiclienden Anatomie. Tubingen, 1864. 
Ei. Meczntkow Ueber Geodesmus MKneatus, nob. {Fasciola terrestris, 0. F. Muller), eine europaischer 
Land-Planarie. Bull. Acad, des Sci. St. Petersb. tom. ix. (1866) p. 433. 
A. Kolliker leones Histologicse, oder Atlas der vergleicbenden Gewebelehre, herausgegeben 
von A. Kolliker. Leipzig : Engelmann, 1866. 
Ed. Grube IJeber Land-Planarien. 
1. Jahres-Bericht der scblesiscben Gesell. fiir vaterland. Kultur, 1866, p. 61. 
2. Beise der osterreichiscben Fregatte ‘ Novara ’ um die Erde. Zoologiscber 
Tbeil, 2. Band, 3. Abtb. p. 45. Anneliden. 
Sir John Lubbock Note on tbe discovery of Planaria terrestris in England. Proc. Linn. Soc. x. 
(1868) p. 193. 
W. Keferstein Beitrage zur Anatomie und Entwickelungsgesehichte einiger See-Planarien von 
St. Halo. Abhandl. d. k. Ges. d. Wiss. zu Gottingen, 1868, B. xiv. 
(I. P.n T.T.E SToisr Forms of Animal Life. 1870. 
Eev. W. Houghton On two species of Land-Planarians from Borneo. Ann. & Mag. Nat. Hist. 1870, 
vol. vi. p. 255. See also pages 347 & 495 ibidem. 
Gegenbaur Grundziige der vergleicb. Anatomie, Zweite Auflage. Leipzig, 1870. 
Dr. F. Sommer und Dr. L. Beitrage zur Anatomie der Plattwiirmer, von Dr. F. Sommer und Dr. L. Landois. 
Landois. Erstes Heft. Heber den Bau der geschlechtsreifen Glieder von Bothriocephalus 
latus (Bremser). Leipzig : W. Engelhann, 1872. 
As regards the foregoing bibliography of tbe anatomy and zoology of the Dendro- 
coelous Turbellaria, it may be sufficient to remark that the two memoirs by Duges 
deserve perusal and attention even at the present day, though written with reference to 
freshwater species exclusively (with the single exception of the marine species which I 
have myself used in this paper for purposes of comparison), and at a period when 
the microscope was a very different instrument from the one I have employed. As 
regards the correctness with which the organs in relation with the generative outlet 
were identified by Duges and Von Baer respectively, there is no doubt that the French 
naturalist has the advantage. Duges’s anatomical description {loo. cit. xv. p. 163, 1828) 
of the water-vascular system is, speaking roughly, correct ; he would have done well, 
however, to have adhered to his original view of its intimate connexion with the 
nervous system; and the demonstration of the large share of truth which this view 
embodies, as established definitely by Quatrefages (Ann. Sci. Nat. 1845, iv. pp. 172-177), 
marks an epoch of advance in our interpretation of the anatomy of the entire order. 
Schultze, writing in 1852 (Zeits. f. wiss. Zool. iv. p. 187), is a little too summary in his 
condemnation of the method of injection as employed by Blanchard (Ann. Sci. Nat. 1847, 
ser. 3, tom. viii. p. 146). On the other hand, Schultze would, judging from the analogy 
furnished by our own Land-Planarians and by all freshwater species, appear to be right 
(Halle Abhandl. 1856, p. 33) in accusing Blanchard, in his description of Polycladus , 
of having mistaken the tail of the animal for its head. The Geojplauce dissected by 
Schultze ( loc . cit. p. 33) appear to have had their reproductive organs in a state of 
quiescence. 
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