Dr. O'Bryeu Bellingham uii 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- 

 com])anying 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 L-ish 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 rprji-ta, foramen.) 



" Corpus depressum vel teretiusculum, molle. Pori 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 

 differing 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 /uoios, unus, and aro/zo, 05.) 



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

 no abdominal pore, or posterior terminal orifice. 



