494 APPENDIX. 



IV. LIST OF SPECIES NAMED AFTER THE LATE 

 WM. THOMPSON, ESQ. 



Acipenser Tliompsoni, Ball, Proc. R. I. Academy, n. 25, p. 21. 

 Bulimus 2'hompsoni,* Pfeiffer, Proc. Zool. Society. 

 Lepeoptheirus Tliompsoni, Baird, Hist. Brit. Entomostraca, p. 278. 

 Thanmantias Thompsoni, Forbes, Annals Nat. Hist. vol. vii. p. 84. 

 Meloseira Thompsoni, Harvey, Manual Brit. Alga;, p. 195, 1st edit. 

 This is the Lynghya TJiompsoni of Hassall. 



Spirillum TImnpsoni, Hassall, Brit. Fresh-water Algae, p. 278, 1st edit. 

 This is the Anabaina sjm-alis of W. T. 



Dolichosjiermum Thompsoni, Ralfs, Annals Nat. Hist.' vol. v. p. 336. 

 This is Harvey's Anabaina Jlos-uquce. 



Pterinea Thompsoni, Portlock, Geol. Siu'vey of Londonderry, p. 431. 

 Hippolyte Thompso7ii, Bell, Hist. Brit. Crustacea, p. 290, 

 Payurus Tliompsoni, Bell, — - — p. 373. 



There may possibly be other species, named in like manner, but of 

 which we are not at present informed. — Ed. 



V. FISHES OF LOUGH NEAGH AND LAKE GENEVA, f 



In the department of fishes, a comparison between the two lakes is 

 very interesting, not only as illustrative of geogi'aphical distribution, but 

 of the comparative value of their finny inhabitants. The number of spe- 

 cies found in each lake may be set down as the same, or twenty-one in 

 each. Of this number eight are common to both localities, namely, 



Perca Jluviatilis. 



Gobio — 



Leuciscus Erythrophthalmus. 



Cobitis barbatula. 



* With respect to this species, we find the following memorandum in Mr. 

 Thompson's hand-writing : " This is a South American species, brouglit home 

 by Gordon A. Thompson, Esq., to Belfast Museum, and which I placed in the 

 hands of M. Pfeiffer, jun., for description. Hence it was named after me; but 

 as I was not particularized, I wished it to be understood as called after the gen- 

 tleman named ; and wrote to the describer to that effect." 



t [It seems to have been Mr. Thompson's intention to have investigated the 

 Natural History of Lough Neagh and the Lake of Geneva, both positively and 

 comparatively; but that part of his MSS. which treats of the fishes, is the only 

 portion which has been left in a state sufficiently far advanced to warrant pub- 

 lication. — Ed.] 



