. The skeleton of the black bass . in the pterygopalatine arch ofthis bass we meet with the metapterygoid,the ento, and ectopterygoid and the palatine,and the relation of these bones to each otherare shown in fig. 3 of the present paper anddescribed in my Amia memoir, where alsothe hyoid and branchial arches of Micropterushave been touched upon in considerabledetail. In this connection I have pointedout that the branchiostegal rays (fig. 3, ) constitute the skeleton of an organ ofdefense to the respiratory apparatus, and that many believe that the opercular bonesare merely modified branch
. The skeleton of the black bass . in the pterygopalatine arch ofthis bass we meet with the metapterygoid,the ento, and ectopterygoid and the palatine,and the relation of these bones to each otherare shown in fig. 3 of the present paper anddescribed in my Amia memoir, where alsothe hyoid and branchial arches of Micropterushave been touched upon in considerabledetail. In this connection I have pointedout that the branchiostegal rays (fig. 3, ) constitute the skeleton of an organ ofdefense to the respiratory apparatus, and that many believe that the opercular bonesare merely modified branchiostegal rays. Passing from the skull and its arches we come to consider the shoulder girdle, asequence of bones that have been differently viewed and differently named by differentichthyologists. In my work upon Amia calva I have contrasted in tables these variousopinions and appellations, and figured the bones, and also named a bone, the supra-linear (si.), that is in a way connected with the shoulder girdle above (see fig. 3).. Fig. 5.—The left outer aspect of the upper jaw of , together with the hones associated with latter are slightly dislodged from their normalpositions, the better to show their relations. Abouttwo-thirds natural size, from the actual specimen, by theauthor, from his own dissections. Mx, maxillary;Ptnx, premaxillary; IL, palatine; a, admaxillary. THE SKELETON OF THE BLACK BASS. 317 In the latter, in Micropterus, we bave a posttemporal {Pst. T.), a posterotemporal{Psto. T.), a teleotemporal (T.), a lower teleotemporal (T.), a hypocoracoid {Hyo. c), ahypercoracoid (Hyp. c), and a proscapula (P. 8c.). Now the Mteral or the pectoralfins in this bass are connected with the shoulder girdle through the intervention offour little bones, called actinosts (flg. 7, Ast.); they are very small, graded in size, andare formed somewhat like little hour-glasses or dice-boxes, being enlarged at theirarticular ends and constricted at the middle. Ant
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