NO. 1410. NOTES ON CESTODE CYSTS— LINTON. 821 



joiirne}^ around the world, and brought back to Rudolph! as a mark of 

 h'us regard for the renowned helminthologist. 



I unfortunately the alcohol in which the cysts had been ])reserved 

 was too weak and consequently the material was not in good condition 

 for study. So that nothing remained except the hard external vesicle, 

 which, he states, is harde^- and more coriaceous than ordinarily (solito 

 duriar et coriacea). 



The cysticercus itself, he says, had lost its opening, and one of 

 tliem exhibited a decidedly oblong-ovate form, with the anterior part 

 very broad, the body and head being rectracted. This he was not 

 a])le to preserve even by pouring stronger alcohol upon it. More- 

 over, in the macerating cysticercus the interior part of the vesicle was 

 seen to contain a filamentous portion which was somewhat long and 

 slender, and which, wdien examined under the microscope, might be 

 said to be slightly crenuhited on l)oth sides or to (consist of wrinkle- 

 like segments. The description closes with the remark that no one 

 had ever before seen a similar structure in other cysticerci, and for that 

 reason a further examination of the species is especially commended. 



1 think there can be little doul>t that the description paraphrased 

 above applies to cysts specifically identical with those which are the 

 subject-matter of this paper, and furthermore that they are the sex- 

 ually immature stage of an undescribed species of Drnia or closely 

 I'elated genus. 



Since it is desirable that there should be a definite name for these 

 highl}' characteristic cysts, the new specific name Taenia cli<niiiss(>nn 

 is proposed for them. 



Cobbold indicates the probable final host of Cystletrcus delph'ini 

 thus: 



Tlie sexually mature state of this worm, an the Belgian savants (Beneden, father 

 and son) remark, is to be looked for in some one or other of the larger sharks. 



This will doubtless prove true, since the adult form would be a 

 l*hijUoh()i]ii'(uni^ and that genus is peculiar to selachians. 



This will doubtless be the case with respect to the final host of Phyl- 

 lohothrium. delphivi., since that genus is peculiar to selachians. 



It can hardly l)e the fate of C'hamisso's cysticercus, however, which, 

 being a true l)ladder worm, and not a plerocercus, characteristic of 

 PhyUohofliriam and its allies, rather suggests a mannual as the final 

 host. It is more likely therefore that the final host of Chamisso's 

 cysticercus will be found to be some pedaceous mannual like the killer 

 whale ( (h'cinus orca). 



