. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Pelvis of the Mysticete Whale. Muscles of the anterior Jin of a Dolphin. a. Rhomboideus. e. Sterno-mastoideus. b. Levator scapulae. /. Costo-humeralis or latissimus dorsi. c. Infra-spinatus. g. Portion of pectoral. d. Humero-mastoideus. h. Splenius. (2) four, the digitus medius (3) five, the annu- laris (4) four, and the digitus parvus (5) three bones; all are terminated by a cartilaginous dilatation: they form collectively a large and short paddle, obliquely rounded. The muscles which characterize the arm of the Mammali
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Pelvis of the Mysticete Whale. Muscles of the anterior Jin of a Dolphin. a. Rhomboideus. e. Sterno-mastoideus. b. Levator scapulae. /. Costo-humeralis or latissimus dorsi. c. Infra-spinatus. g. Portion of pectoral. d. Humero-mastoideus. h. Splenius. (2) four, the digitus medius (3) five, the annu- laris (4) four, and the digitus parvus (5) three bones; all are terminated by a cartilaginous dilatation: they form collectively a large and short paddle, obliquely rounded. The muscles which characterize the arm of the Mammalia exist generally also in the Dolphin, and doubtless in the other Cetaceans, but with modifications which have not been so satisfactorily described as could be wished. The great pectoral muscle (a part of which is seen atg, fig. 256) presents the sternal portion, which is called the mmculus communis,QT mus- cle common to the' two arms. The latis- simus dorsi (J]') is represented by a little muscle, the digitations of which are attached to the ribs; the supra-spinatus and infra- spinutus are nearly of equal size, but the sub- scapularis is very large. The coraco-brachiulis is very short. The muscles of the other parts of the arm, that is, of the fore-arm and hand, appear in a rudimental state, and seem to exist less on account of the movements of the parts to which they are attached, than to shew the analogy of the anterior members of the Cetaceans with those of other Mammalia. [In our dissections of the common Porpesse we have found the supra-spinal is of small size, corresponding to the size of the supra-spinal fossa. It is covered by the deltoid muscle (i). The infra-spinatus (c) is consequently of much larger size, but is a thinner muscle: behind this muscle is seen the teres major ( k) and minor (/).] As we have already said, the posterior extre- mities are wanting; all that remains of them are the rudiments of a pelvis. These rudiments are found in the Dugong to b
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