. Catálogo de los objetos que componen el contingente de la Comisión, precedido de algunas notas sobre su organización y trabajos. .1 New Rabbit from México. 171 Animáis differing so widely in habits and manner ofprogres- sion as the present species and the ordinary rabbits would be expected to differ in tlieir skeletons. Fortunately, Mr. Nelson preaerved a perfect skeleton of the new rabbit, which on com- parison with those of the several subgenera of Lepus shows differ- ences of considerable morphologic weight. The clavicle is complete and articulates directly with the sternum (fig. 33)-—a t
. Catálogo de los objetos que componen el contingente de la Comisión, precedido de algunas notas sobre su organización y trabajos. .1 New Rabbit from México. 171 Animáis differing so widely in habits and manner ofprogres- sion as the present species and the ordinary rabbits would be expected to differ in tlieir skeletons. Fortunately, Mr. Nelson preaerved a perfect skeleton of the new rabbit, which on com- parison with those of the several subgenera of Lepus shows differ- ences of considerable morphologic weight. The clavicle is complete and articulates directly with the sternum (fig. 33)-—a thing that never happens in the gemís Lepus. 11 uxley describes the clavicle ofthe rabbit as"incom- plete at both ends," and Flowerstates that it " is very short and is suspended by long ligaments between the scapula and the ; The manubrium or presternum is broadly expanded between and anterior to the articulation of the first pair of ribs ífig. 33), a condition unknown in the gemís Lepus, in which it is always long and narrow (fig. 34). Flower calis attention to the corre- lation existing between the form of the presternum and the degree of development of the clavicle, stating that " the presternum is compressed and produced forwards in FlG. 33_steni„m of those rodents in which the Romeroiagus »,/ d- i . i t soni (nat. size). avíele is absent or rudimen- tary," as the bares, and " is generally broad in the forms which have the clavicle well developed, as the rats, beavers, &; This interesting correlation is well exemplified in the Popocatepetl rabbit, which, having a complete clavicle, has also a binad manu- brium. The segmente of the mesosternum (between the pre- sternum and xiphoid) are only three in number (fig 33), while in all the subgenera of Lepus the number is four (fig. 34). The ribs are correspondingly reduced, only six páirs instead of seven articulating with the sternum. The tubercles of the ribs a
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