494 
APPENDIX. 
IV. LIST OF SPECIES NAMED AFTER THE LATE 
WM. THOMPSON, ESQ. 
Aeipenser Thompsoni, Ball, Proc. R. I. Academy, n. 25, p. 21. 
JBulimus Thompsoni* Pfeiffer, Proc. Zool. Society. 
Lepeoptheirus Thompsoni, Baird, Hist. Brit. Entomostraca, p. 278. 
Thaumantias Thompsoni, Forbes, Annals Nat. Hist. vol. vii. p. 84. 
Meloseira Thompsoni, Harvey, Manual Brit. Algae, p. 195, 1st edit. 
This is the Lyngbya Thompsoni of Hassall. 
Spirillum Thompsoni, Hassall, Brit. Fresh- water Algae, p. 278, 1st edit. 
This is the Andbaina spiralis of W. T. 
Dolichospermum Thompsoni, Ralfs, Annals Nat. . Hist.' vol. v. p. 336. 
This is Harvey’s Andbaina Jlos-aqucs. 
Tterinea Thompsoni, Portlock, Geol. Survey of Londonderry, p. 431. 
Hippolijte Thompsoni, Bell, Hist. Brit. Crustacea, p. 290. 
Pagurus Thompsoni, 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 geographical 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, 
Perea 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, brought 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.” 
•f [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.] 
