430 Mr. W. Thompson's Additions to the Fauna of Ireland. 

 32. Distoma *. Small intestine of pochard (Fuligula/erina). 



* In the month of January 1839 I found a large number of an ap- 

 parently undescribed species of Distoma in the small intestine of the 

 pochard (FuUgula ferina); when recent they were subrotund, but 

 (after having lain in water for twenty-four hours) they became nearly 

 flat on being placed in spirits ; colour reddish at first, afterwards dirty 

 white ; head subreniform, unarmed ; neck (or that part between the 

 pores) generally curved, the concavity upon the abdominal surface 

 forming a channel at this place. Both extremities attenuated. Pores 

 orbicular, seated near each other ; anterior very small and terminal ; 

 ventral much larger, cup-shaped and prominent. Between the an- 

 terior and ventral pore, close to the ventral, a lemniscus is some- 

 times seen to project. 



[To be continued.] 



XLVIII. — Additions to the Fauna of Ireland. By William 

 Thompson, Pres. Nat. Hist, and Phil. Society of Belfast. 



MOLLUSCA. 



Class Gasteropoda. 



Order Nudibranchiata. 



Doris repanda. Alder and Hancock, Annals Nat. Hist. vol. ix. p. 32. 

 A specimen of this Doris was found between tide-marks at Round- 

 stone, county Galway, in July 1840 : R. Ball, E. Forbes, W. T. 



Doris aspera. Aid. and Hanc, Ann. Nat. Hist. ix. 32. Very young 

 examples of a Doris, and most probably (according to Mr. Alder) 

 of this species, were obtained at Glandore bay, county of Cork, by 

 Dr. George J. Allman in the month of August 1842. Mr. Alder 

 himself procured specimens of D. aspera during an excursion in 

 September last with Dr. Farran of IDubhn to Malahide, on the 

 coast of the county of Dublin*. 



Goniodoris nodosa, Mont, (sp.) ; Doris nodosa, Mont., Linn. Trans, 

 vol. ix. p. 107. t. 7, f. 2. Twelve specimens of G. nodosa occurred 

 on a plant of Fucus vesiculosus dredged in Killery bay, county of 

 Galway, in July 1840 : R. Ball, E. Forbes, G. C. Hyndman, W. T. 

 Mr. Alder found the species to be plentiful at Malahide in Sep- 

 tember last. 



Pohjcera ocellata, Aid. and Hanc, Ann. Nat. Hist. vol. ix. p. 33. 

 Mr. Alder, by means of the dredge, took this species commonly and 

 of all sizes in Dublin bay in August last, and subsequently ob- 

 tained a specimen at Malahide. 



Pohjcera citrina, Alder, Ann. Nat. Hist. vol. vi. p. 340. pi. 9. f. 7 — 9. 



* The new species of Mollusca Nudibranchia obtained on this occasion 

 are described by Messrs. Alder and Hancock at p. 161 of the present 

 volume. 



