434 Mr. T. C. Eyton's Account of a Dredging Expedition 



abode, exercise a more or less fatal influence upon the life of the 

 animal in which they live. 



The experiments commenced on the Echinococcus veterinorum 

 are sufficiently advanced to enable us to declare that this cystoid 

 worm also belongs to a Tania. A quantity of these destructive 

 worms given to some young dogs, showed at the end of a few 

 days myriads of exceedingly delicate Tsenias, which already ad- 

 hered to the mucous membrane of the small intestine by their 

 four suckers and their crown of hooks. All these Tsenias only 

 possessed as yet three divisions in the body — one for the head 

 and neck, a small joint behind this, and lastly a long segment. 

 In these two joints the sexual organs had commenced their de- 

 velopment ; but this was not sufficiently advanced to enable one 

 to be certain that these little Tsenias were adult, or to determine 

 the species. I am continuing the experiment and hope soon to 

 be able to publish the result. 



XLIV. — Some Account of a Dredging Expedition off the coast 

 of the Isle of Man during the months of May, June, July and 

 August 1852. By T. C. Eyton, Esq., F.L.S., F.Z.S. 



[Continued from p. 285.] 



The following is a list of Echinodcrmata taken with the dredge 

 and on shore : — 



Ophiura texturata. Dredged off Maughold Head : not very 

 plentiful. 



Ophiocoma neglecta. Under stones and roots of Laminaria 

 off Derby Castle at low water mark. 



granulata. Dredged off Laxey in abundance. 



rosula. Very common. 



bellis. Dredged off Laxey in 16 fathoms water. 



Uraster glacialis. Not very common round the island. 



rubens. Common. 



Cribella oculata. Common in from 10 to 20 fathoms water, 

 but not so much so as in from 5 to 10 fathoms, or as on the 

 Welsh coast. 



Solaster endeca. Dredged off Maughold Head and Laxey, but 

 not very common. 



papposa. Common. 



Palmipes membranaceus. I took only three specimens, one off 

 Douglas Head and two off Laxey Head, 



Asturina gibbosa. Only once found in a cavity of the rock 

 opposite Derby Castle. 



Asterias aurantiaca. Several specimens were dredged up, but " 

 it does not appear to be very abundant. 



