C0XCH0 LOGICAL AUTHORS. 
xix 
islands is now very properly placed in the British Museum: 
and we may venture to predict, that a fine paper copy of 
his work, with the plates colored, will in no long lapse of 
time bear a great price. 
Pennant. British Zoology, by Thomas Pennant, Esq. 
4 vols. octavo, with plates, 1812. 
A new edition by his son. The fourth volume contains 
the Tcstacea, with fifty-nine plates of shells, and specific 
descriptions of each species, interspersed with those stores 
of erudition with which the venerable and respectable au¬ 
thor occasionally enriched the subjects of his contempla¬ 
tion. Pennant was the first who reduced the British 
Conchology to the Linn^an classification, and reformed the 
language : and it is an anecdote not generally known, but 
justly deserving of record, that the original edition of this 
work, in folio, was undertaken and completed at his sole 
expense, for the benevolent purpose of assisting the Welsh 
Charitable Institution in London. 
Walker. Testacea minuta rariora, By G. Walker. Quarto; 
With three plates, 1 JSJ. 
We are first indebted to the researches of this author, 
assisted by Mr. Boys, for an inquiry into the diminutive but 
singularly elegant and beautiful species of shells, which 
had been before considered either as unimportant, or be¬ 
neath the trouble of collection and arrangement. In his 
work are figured eighty-seven microscopic subjects, with 
short descriptions. His eighty-eighth and eighty-ninth 
figures represent two new species of Echinus, which we 
have collected both on the English and Irish coasts. Mr. 
Pennant the younger, at p. 140. pi. 38. f. 1, 2, 3. of his 
fourth volume, has described and figured the former of 
these, under the name of Echinus Pulvinulus, as a new 
discovery, not aware of Walker’s previous claim. But the 
scattered fragments of general science it is not always easy 
to gather together. The excellent Montagu could have no 
remote suspicion, that the Fasciola Trachea, or poultry- 
worm, described by him in the Transactions of the Werne¬ 
rian ^Society, had been known to us for nearly twenty years, 
and is described and figured in the Gentleman’s Magazine. 
It might not have been known to Curtis, that the natural 
history of the Aphis and the honey-dew was the discovery 
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