. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. 176 IIIUII SCHOOL ZOOLOGY. able and to bolt, without !i â rfi- m ''! ';i 1 i sociiro ana to noit, wiinout previous mastication, in a very short time, a large amount of food, which they after- wards masticate when thoy have got to some secure retreat. The mechanism concerned may be studied in the sheep's stomach, wliere the cardiac end has two compartments, the larger Rumen (paunch)^ and the smaller Reticuhim (Jioneycotnli), wliile the pyloric end has similarly two compartments, the Psalterium (7nar.,jj}l
. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. 176 IIIUII SCHOOL ZOOLOGY. able and to bolt, without !i â rfi- m ''! ';i 1 i sociiro ana to noit, wiinout previous mastication, in a very short time, a large amount of food, which they after- wards masticate when thoy have got to some secure retreat. The mechanism concerned may be studied in the sheep's stomach, wliere the cardiac end has two compartments, the larger Rumen (paunch)^ and the smaller Reticuhim (Jioneycotnli), wliile the pyloric end has similarly two compartments, the Psalterium (7nar.,jj}lies)y and the Abomasum {rennet stomach). The feso[)hagus is attached between the rumen and the reticulum, the grass which is liastily swallowed passes first into these compartments ; it is then moved from one to the other, and finally tlirown back into the mouth and subjected to a thorough mastication and insalivation, after which the semi-fluid product is again sv/allowed and stniined oflT into tlie abomasum and in- testine, throiigh the psalterium, which is connected indirectly with the oesophagus by a half-groove on the wall of the reticulum, capable of being converted into a complete channel. A peculiar dentition accompanies the ruminant stomach ; in the typical forms it is ig, c^, m^^, there being only a pad in the upper jaw, against which the lower incisors and incisor-like canines bite. A wide gap sei)arate3 the front teeth from the molars, which have flat crowns with semilunar folds of enamel on the surface. Such teeth are therefore said to belong to Felenodont forms, in contradistinction to the tuberculate teeth of bunodont forms, but it is obvious (as in the Hippopotamus, ^) that a tuberculate tooth when worn down may present a Fig. lie.âMolars from the up- , !⢠i. /. 11 ,1 per jaw of Bunodont and Seleiio- peculiar pattern ot enamel, and there-dont fossil Artiodactyia, Pateo- fore bunodont forms are regarded ,,^chc,rvs^n^Xiphodon. more primitive (Fig. 11
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
