1 882.] Recent Literature. 41 



Mr. Walcott also feels "justified in stating that there is a series 

 of jointed legs extending from the cephalic shield beneath the 

 thorax and pygidium to the posterior segment of the latter; that, 

 as far as known, they were ambulatory, and formed of six or 

 seven joints ; that to the basal joint there was attached an epipo- 

 dite and branchia ; and that, from the proof we now have, there 

 is little doubt but that the appendages beneath the pygidium did 

 not vary essentially from those of the thoracic region. They 

 may have terminated in a slender filament, or filaments, as but 

 three joints have been seen in any one appendage." We con- 

 gratulate the author on the success of his long-continued efforts 

 and well-directed labors; he has fully demonstrated that Trilo- 

 bites have slender jointed limbs on the general plan of those of 

 Limulus, and not phyllopodous ones ; while he has also shown 

 that the branchiae were also attached to certain of these limbs, 

 though we may not be satisfied with his interpretation of the 

 nature of these gills, and wait for further light on this extremely 

 difficult point. His restoration of a Trilobite will be useful, 

 although it does not seem entirely natural, but yet may express 

 the results of Mr. Walcott's work thus far. He'has settled, how- 

 ever, in an admirable way, the general nature of the appendages 

 of the Trilobite, and is entitled to the thanks of palaeontologists. 



Recent Books and Pamphlets.— Herpetologische Bemerkungen vorzugsweise 

 Hamburg. Mit 3 Tafein 11. Abhildungon. 8vo, pp. 16,4 plates, boards. Bremen, 



the author. 



La Revue Scientifique, de la France et de L'etranger. Revue dcs Cours Scien- 

 titique, ( je Serie) Uirecteurs: MM. Antoine Iheguet et Charles Richet. Paris, 

 Octobre 29, 1 88 1. From the directors. 



Notice sur les Poisons Tertiairo de Cereste ( Bas>es-AIpes). Par M. H. E. Sauv. 

 age. 8vo, pp. 22, 4 plates. Extrait du Bu I giqoe de France. 



3 e serie, t. vm, seance du 21 Juin, 1880. Paris, 1881. From the author. 



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