342 



Miscellaneous. 



species, B. Haimeanus (Ann. Sci. Nat. 4 e ser. tome i.), which he met 

 with at the Balearic Islands, at Mahon, and also at Cette, in Ostrea 

 edulis and Cardium rusticum. The author has frequently found the 

 latter or a nearly allied species in Cardium edule, inhabiting the 

 same regions of the body of the host, and presenting the same mor- 

 phological characters. 



The cockles in which the parasites are found have a sickly aspect, 

 by which they may be easily recognized ; their abdomen, which is 

 normally firm, yellow, and opaque, becomes soft and whitish ; " it 

 has the aspect of an cedematized tissue, infiltrated with fluid" 

 (Lacazo Duthiers, I. c). 



a. Oral cup. 



Bucephalus Haimeanus from Cardium edule. 

 b. Digestive cavity, c. Geuital apparatus, d. Excretory 

 organ, e. Caudal appendage. 



On opening such a Cardium the lacunar tissue representing the 

 general cavity is seen to contain an immense number of white fila- 

 ments, several centimetres in length, branched, knotted about the 

 intestinal loop, and pushing away the hepatic, renal, and genital 

 glands ; the atrophy of the last-named is especially marked. 



These tubes, the sporocysts, cannot move, but they possess a cer- 

 tain amount of contractility. Within them are Cercariae in all states 

 of development. These are described by Lacaze-Duthiers. In fact 

 the author can detect scarcely any difference between the parasites 



