THE 



VOYAGE OF H.M.S. CHALLENOEK. 



ZOOLOGY, 



EEPORT on the Myzostomida collected during the Voyage of H.M.S. 

 Challenger during the years 1873-76. By Dr. L. von Graff, 

 Professor of Zoology and Comparative Anatomy in the University 

 of Graz, Austria. 



SUPPLEMENT. 



Since the publication of my Report on the Myzostomida collected during the voyage 

 of H.M.S. Challenger, I have received from my friend Dr. P. Herbert Carpenter, F.R.S., 

 a number of specimens, of which the following pages contain a Supplementary Account. 

 The collection includes seven new forms, besides fourteen species previously described. 

 I shall follow the enumeration given in my Report, and append the new species to the 

 previous list ; in the case of each species references are also given to the literature which 

 has appeared since the publication of my Report. I must refrain from entering upon any 

 discussion of the numerous interesting questions which have been raised by recent 

 researches on the Myzostomida,' and this I do the more willingly, since my friend and 

 pupil Dr. von Wagner has undertaken the task of working out, on the basis of thorough 

 anatomical investigation, the generic classification of the species, which, including those 

 aliout to be discussed, now numl^er seventy-eight. 



Of the forms included in Carpenter's collection, three are in such an imperfect 

 state of preservation that no adequate diagnosis can be given. One of these was 

 dredged by Dr. J. Anderson, F.R.S., at Padau Bay in the Mergui Archipelago, on 

 Antedon milberti, Valenc. sp. The second was found in the same locality, either on 



'A complete bibliography will be found in the large memoir by Fridtjof Nansen, Bidrag til MyzostomemeB 

 Anatomi og Histologi, Bergen, 1885, 4to, 80 pp., 9 pis. In addition to this must be mentioned the contemporary 

 memoir by F. voii Wagner, Das Nervensystem von Myzostoma (F. S. Leuckart), Graz, 1886, 8vo, 52 pp., 1 pi. 



(kOOL. CHALL. EXP. — PART LXI. 1887.) Ppp 1 



