I 



OUCULLANIDiE. 95 



not been studied in any member of tliis genus ; and we are still 

 uninformed as to the migrations of the young after their escape 

 from the parent. In all probabihty the embryos enter the bodies of 

 various fishes before they have acquired sexual maturity, and are 

 thence passively transferred to the stomachs of cetacea, whence 

 they bore their way through the tissues into the bronchi and pul- 

 monary blood-vessels. Though usually found in the above situa- 

 tions they are also particularly partial to the cranial sinuses ; the 

 Prosthecosacter minor being frequently lodged within the cavity of 





Pig-. 23. — Cmullanus foveolatus, 'Rudol^^hi ; from the intestine of the common plaice {Platessa 

 vulgaris). Female ; X 15 diam. — Busk. 



the tympanum. Both Mr. Quekett and myself found examples of 

 Prosthecosacter inflexus occupying the chambers of the heart.* 



Gucullanidce. — These parasites are in many respects closely 



* The presence of full grown and sexually mature nematodes within the cavities of 

 the heart is of rare occurrence, although these parasites in their embryonic condition (as 

 well as others of the so-called hasmatozoa,) are not unfrequently found in the blood. I 

 have heard it stated that in China dogs frequently perish, from nematodes filling up the 

 cavities of the heart, and I have seen one such dog's heart which had burst from over- 

 distension occasioned by their presence. From my recollection of the specimen, I believe 

 the nematodes iji question to have been examples of Spiroptera sanguinolentu. In the 

 Journal de Medecine for 1813, the occurrence of this nematode in the heart of a 

 wolf is described by M. Bohe-Moreau. During my connection with the Edinburgh 

 University Ajlatomical Museum, I remember to have received an important manuscript 

 bearing on this subject, but I fear the communication has since been lost. 



