. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 173 usually contributed to by the pubes and ischia. In Fishes, a supporting arch from the spinal column to the posterior limbs* is not wanted, but rather a free ami unimpeded motion for the caudal extremity, used in propelling the body. In the Angler there are two pelvic bones, eacli consisting of a vertical portion, which, in this instance, seems to represent the ilium, and a horizontal one, which meets in a symphysis with the one on the opposite side, and is the homologue of the pubis, the pectoral rays being a
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 173 usually contributed to by the pubes and ischia. In Fishes, a supporting arch from the spinal column to the posterior limbs* is not wanted, but rather a free ami unimpeded motion for the caudal extremity, used in propelling the body. In the Angler there are two pelvic bones, eacli consisting of a vertical portion, which, in this instance, seems to represent the ilium, and a horizontal one, which meets in a symphysis with the one on the opposite side, and is the homologue of the pubis, the pectoral rays being attached to the angle of union of the two portions. In the Rays and Sharks, where the pelvic extremities are better de- veloped than in other fishes, the pelvic bones consist of one piece, placed transversely, resembling that which supports the pectoral fins, and suspended loosely, like it, by a ligament to the spine. In the Sharks and Chimera are found, articulated to it, by means of an intermediate cartilage, two club-shaped bones, called claspers, which are used to em- brace the female in the generative act. In the Torpedo, and also in the Cyclobatcs oligo- dactylus, an extinct Ray, the pubic bone sends forward two processes, somewhat resembling marsupial bones. In the Sturgeon, the pelvic bones are almost entirely separated from each other, and consist of small triangular pieces, with their apices directed forwards, and sup- porting the cartilaginous fin rays. In the Cod-fish there are two. sub-triangular bifur- cated bones, connected to each other by liga- ment, and suspended from the coracoids, the rays of the ventral fins springing directly from them. In the Trout, the pelvic bones are also two in number, flat and of an elongated tri- angular shape, with the base directed pos- teriorly, and supporting the ventral fins (see jig. 111. c). In the Haddock, there is a single bone, presenting a central oval opening with the shorter diameter transverse. In the Cyprinus, Scomber
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