394 Dr. Cohhold on Taenia pectinata. 



ART. XXXVTI. — Remarks on Tasnia pectinata. In a letter 

 from Dr. T. Spencer Cohhold, M.D., F.L.S., London 

 (^England), to Professor Lawson, Queen's College, Kingston, 



(For the Canadian Naturalist.) 



39 Norland Square, Notting-Hill, London, W., 

 Monday, September 22nd, 1862. 



My dear Sir, — You have rightly conjectured that I am still 

 interested in Entozoa, and I thank you ranch for your thoughtful 

 consideration in troubling yourself to send me some Cestode pa- 

 rasites. You may be sure Pouchet and Verrier's observations 

 have not escaped me, and I flatter myself very few other authors 

 who write on Entozoology are unknown to me by name or other- 

 wise. 



The tape-worms you have so kindly sent are very interesting 

 specimens.* I make no doubt that they are referable to the 



T^NIA PECTINATA, GoCZC. 



T. pect. also of Schrank, Gmelin, Rudolphi, Batsch, Bremser, 



Dujardin, and Diesing. 

 T. acutissima Leporls of Pallas. 

 T. Leporina, Limbourg. 



T. Cuniculi sylvestris, Doubrenton and Marigues. 

 T. Marmolcs, Frolick. 

 Alyselminthus pectinatus, Zeder. 

 Halysis pectinata, also of Zeder. 

 Nine out of every ten zoologists would have described your 

 worm as a new species, but I protest against the system which 

 some here adopt of never looking up the older writers. 



Hitherto this worm has only been noticed in the hare {Lepus 

 timidus), rabbit (L. cuniculus), and marmot {Arctomys Mannota), 

 and therefore its occurrence in Hystrix dorsata is a novel fact of 

 very considerable interest. 



This Cestode is very like (at first sight) a new tape-worm just 

 discovered by Leuckhart, as infesting the human body and dogs 

 in North Greenland (^Bothryocephalus cordatus of Leuckhart) ; 

 but its essential characters are very different. In B. cordatus the 



* The specimens were obtained from the intestines of the Canada por- 

 cupine {Hystrix dorsata), male and female individuals of which were 

 shot by Mr. Fox and Mr. Moore during one of Prof. Lawson's expeditions 

 to the Rideau and Gananoque Lakes. 



