CETAOEA 429 



phytophagous manatee-dugong group and the true whales, the 

 parasites of this remarkable order of mammals (Sirenia) will be 

 most conveniently noticed in this place. Not much is known 

 respecting them. A single species of Amphistome (A.fabaceum) 

 of the usual size has been described and figured by Diesing 

 from the caecum and large intestine of Natterer's manatee 

 (Manatus exunguis), the same mammal yielding a rather pecu- 

 liar nematode, Heterocheilus tunicatus. This worm possesses a 

 complicated set of cephalic lobes and oral papillae, which at first 

 induced Diesing to call the genus Lobocephalus. These struc- 

 tures have been fully described and figured in Diesing' s account 

 of the anatomy of the worm in the ( Annals of the Vienna 

 Museum/ The males measure 1J" and the females up to 1J" 

 in length. From the stomach of an Indian dugong (Halicore) 

 Riippell and several other naturalists obtained lumbricoid worms 

 (Ascaris halicoris, Owen), the males of which measured 2" and 

 the females from four to five inches in length. Riippell's 

 specimens were from the Red Sea and Owen's from Penang. 

 From the now extinct Rhytina Stelleri similar worms were 

 obtained by Steller, who called them Lnmbrici caudidi. Fol- 

 lowing Brandt's nomenclature the species has since been 

 recognised as Ascaris rhytina. The worms measured half a 

 foot in length, and occupied the stomach and duodenum. They 

 were obtained by Steller in July, 1742, the last of the Rhytinas 

 having been seen in 1768. 



BIBLIOGEAPHY (No. 55). Baird, "Entozoa of Cete/' 'Brit. 

 Mus. Catalogue/ Index, p. 120, 1853. Idem, "Ascaris hali- 

 coris/' in 'Ann. Nat. Hist./ 1860, p. 329; see also "Description 

 of a rare Entozoon from the Stomach of the Dugong,'' e Proc. 

 Zool. Soc./ 1859. Beneden, P. J. van, "Les Cetaces, leurs 

 commensaux et leurs parasites," ( Bullet, de 1'Acad. Koyale de 

 Belgique/ p. 348, 1870. Idem, 'Animal Parasites/ 1876. 

 Beneden, E. van, in ' Coinptes Kendus/ 1868. Bennett, D., in 

 'Proc. Zool. Soc./ 1837, p. 30. 'Brandt, " Asc. dugonis and 

 A. rhytinte," in ' Bull. P.-Math. de 1'Acad. Imp. des Sci. de St 

 Peters/ torn, v, p. 192. Colloid, " Trematode Parasites from 

 the Dolphins of the Ganges, Platanista gangetica and Orcella 

 brevirostris," 'Linn. Soc. Journ./ Zool. Div., vol. xiii, p. 35, 

 1876. Idem, " Entozoa of Delphinus phoctena," 'Linn. Soc. 

 Trans./ vol. xvii, p. 167, 1858. Idem, "Descript. of Asc. 

 Andersoni," in ' Notes on Entozoa/ part iv, in ' Proc. Zool. 

 Soc./ March, 1876, p. 296. Idem, ' Catalogue of the Speci- 



