264 Aliscellaneous. 



notes thereon, and expressed his wish and intention to publish his 

 correction of the mistakes. In assenting, I stated that he ought to 

 be clearly convinced what were the Author's and what were the 

 Translator's errors. Some of the latter (from among those pointed 

 out by Prof. I^ewton) I inserted in the Corrigenda, at p. 292 of the 

 ' Reliquiae Aquitanicse.' I should like to have seen in Prof. Kewton's 

 Critical Remarks in the 'Annals ' for February some fair assortment 

 of the burdens for Author and Translator ; but, according to his last 

 paragraph, everybody except the latter is held blameless. It may 

 have been left for the reader to assort the "errors" ; and the dis- 

 crepancies and differences of the author and critic may not have 

 been considered blameable errors. At all events, while I thank 

 Prof. Newton for his earnest desire to contribute to the utility of 

 the work, I must express my regret that the wording of his verdict 

 should have fallen exclusively hard on the Translator for his nomen- ' 

 clatorial errors. Yours obediently, 



Yorktown, Feb. 21, 1876. T. Rupekt Jones. 



On the Astacus modestus of Herhst. By J. Wood-Mason. 



Mr. Wood-Mason exhibited a specimen of the beautiful macrurous 

 crustacean long ago described and accurately figured by Herbst 

 (' Krabben und Krebse,' Band ii. Heft 5, 1794, p. 173, t. xliii. f. 2) 

 under the name of Astacus modestus. This remarkable crustacean, 

 like the Astacus zaleucus, v. W.-S. (for which the new generic title 

 Tlummastocheles had recently been proposed, P. A. S. B. 1874, p. 181), 

 was an example of a transitional form connecting the two families 

 Thalassinidte and Astacidae. In ThaumastocJu-lcs zaleucus thefacies 

 of the former family was combined with characters that entered into 

 the usual definition of the latter ; EutrichocheJes, as he proposed 

 generically to designate the species described by Herbst, on the other 

 hand, was indubitably, as the totality of its organism showed, a 

 member of the latter presenting certain structural arrangements 

 which were unmistakable marks of real aflinity to the former. The 

 CaUiaxis adriatica of Heller was just such another transitional form. 

 In fact it was now, in his opinion, impossible to frame such a defi- 

 nition of either family as would exclude all the members of the other, 

 owing to the number of the connecting links. The Eutricliocheles 

 modestus was also especially interesting as being the nearest known 

 blood-relation of the remarkable blind crayfish described two or 

 three years ago under the name of Nej)liro2)sis Stewarti. In conclu- 

 sion Mr. Mason said that he had long been engaged in the compara- 

 tive study of these and various other allied forms, and that he hoped 

 shortly to be able to formulate the results at which he had arrived. 

 — Proc. Asiat. Soc. Bengal, December 1875. 



The Correct Habitat of Centropagus bre\dcaudatus*, Brady. 

 By the Rev. A. E. Eaton. 



I misinformed Professor Brady as to the locality whence this 

 Entomostracan was obtained. It is not a marine species, but is 

 very abundant in freshwater lakes in Kerguelen's Island. 



February 11, 1876. 



* Desci-ibed in 'Ann. X: Mag. N, H.' ser. 4, vol. xvi. p. 102 (Sept. 1875), 



