Dr. O'Bryen Bellingham on Irish Entozoa, 335 



seen. It evidently presents several analogies to Alaria, the stem 

 near its base sometimes presenting appendages approaching to 

 the fruit-bearing leaflets of that plant; on its surface also pores 

 and accompanying filaments are numerous. 



Laminaria saccharina, Lamour. — This species is very common 

 on all parts of the coast ; it never, however, attains the great size 

 which it does in more favourable localities. From the figures ac- 

 companying this and the former paper, it might be supposed that 

 the sporidia alluded to are not simple but contain sporidiola ; such 

 however is not the case, the inclosed bodies being composed of 

 granular matter cohering in masses and assuming a regular ar- 

 rangement. In L. digitata this granular matter is very abun- 

 dant and has less tendency to cohere, and the regular arrangement 

 of it is also not very evident. 



[To be continued.] 



XLI. — Catalogue of Irish Entozoa, with observations. By 

 O^Bryen Bellingham, M.D., Fellow of and Professor of 

 Botany to the Royal College of Surgeons in Ireland, Member 

 of the Royal Zoological, Geological and Natural History So- 

 cieties of Dublin, &c. 



[Continued from p. 260.] 



Order 3. TREMATODA. 



(Derived from rprj^a, forameji.) 



*' Corpus depressum vel teretiusculum, moUe. Peri suctorii. Om- 

 nia individua androgyna." — Rud. Synop. 



The order Trematoda corresponds very nearly to the order 

 Porocephala of De Blainville. The species included in it, though 

 diifering much in shape from one another, have this general re- 

 semblance, that they are all provided with one or more distinct 

 pores or suckers, disposed upon the body in different ways ; and 

 according to the number of the pores, or their disposition upon 

 the surface, the genera have been formed. 



The head is rarely separated from the body by a neck. The 

 body is soft, either flattened, oval, elliptical, linear or cylindrical. 

 Each individual possesses the organs of reproduction of both 

 sexes. The species occur in mammalia, birds, reptiles and fish ; 

 they generally inhabit some part of the alimentary canal. 



Genus 10. Monostoma. 



(Derived from fxoros, unus, and arofxa, as.) 



Body soft, either flattened or subcylindrical. A single anterior pore ; 

 no abdominal pore, or posterior terminal orifice. 



