820 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



The g-eneral plan will be best understood from the tiuure.s, the 

 explanation of which .should be read. 



It will be seen readil}^ from the figures that the filiform structure is 

 tlie inverted portion of the cysticercus. The relation of these parts is 

 shown in fig. 11. 



The lumen of the filiform part is lined with cuticle which, of course, 

 becomes the external layer when the worm is everted. The scolex 

 *is provided with four suckers which may be seen in fig. 8. Further- 

 moi-e the scolex appears to be truncate in front. This at least is my 

 interpretation of the upper part of fig. 9, near the index line /n. Near 

 the scolex the cuticle is much crumpled (figs. 8 and 9). In longitudinal 

 sections the lateral vessels are seen to be spiral; slightly shown in fig. 9. 



The folds on the inner wall of the bladder at the origin of the fihi- 

 mentar portion (/, in figs. 1, 2, and 5) were seen only in the lot collected 

 bv Mr. Edwards. They may be due to the action of the killing fiuid. 



Encysted cestode worms were recorded by Rudolphi under the name 

 Cysttcercax deJj^h'in'i.'^ Cobbold sunuiiarizes the literature of the sub- 

 ject thus: 



The presence of larval eestodes has been indicated in several whales. Thus, 

 F: Cuvier and Van Beneden state that 8urgeon-Major Carnot, in 1822, found an 

 enormous quantity of small hydatids in the nasal sinuses of a porpoise [Phocoena 

 compressicaudata). These are supj)Osed to be cysticerci. In like manner, Mr. 

 F. D. Bennett, in 1837, obtained numerous capsuled cysticerci from the skin and 

 ])\vib])er oi <bto(Jon [Pltysetcr) maerGcepJiala. * * * 



The naturalist Bosc noticed a larval cest(.)de in the fatty tissue surrounding the 

 reproductive organs of Delphhms delplih. He called it an hydatid {Ht/datis), and 

 Rudolphi placed it with the Cysticerci (C. delpliini) . According to Van Beneden 

 [P. -J.] the parasite in question is probably a sexually immature example of Phyllo- 

 Itothrium delpliini described by his son. Edward Van Beneden found this scolex in 

 great abundan(;e in a dolphin (Z>. delphis), which he dissected at Concarceau in 

 1868. {Parasites of Man and Animals, pp. 421-422.) 



The cysts descri])ed by Ed. Van Beneden'' undoubtedly belong to 

 the genus Phyllohothrliun. In like manner the description given 

 by Rudolphi,'' under CyHticercus delphin/, points to the genus 

 PhyllobothrhuH . 



On the other hand, Rudolphi's account of Cy-stlcercus ddphini'^ 

 indicates a very difi'erent form from that recorded under the same 

 name in his History of the Entozoa, and appears, indeed, to be iden- 

 tical with th(; cysts under consideration in this paper. 



In the Synopsis'' Rudolphi gives a brief account of some very inter- 

 esting specimens which had been brought to him by his very dear 

 friend C'hamisso, having been collected by the poet-naturalist in his 



«Entoz. Hist., II, Pt. 2, p. 236; Synopsis, pp. 182. 544, and 551. 

 ''Bvdl. Acad. Belgique, XXIX, 1870, p. 360. 

 c Entoz. Hist., iT, Pt. 2, p. 236. 

 '1 Synopsis, j). 551. 



