On the bone in Crocodilia which is commonly regarded as the os pubis, and its representative among the extinct Reptilia / by H.G. Seeley.

  • Seeley, H. G. (Harry Govier), 1839-1909.
Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: On the bone in Crocodilia which is commonly regarded as the os pubis, and its representative among the extinct Reptilia / by H.G. Seeley. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    “ On the Bone in Crococlilia which is commonly regarded as the Os Pubis, and its representative among the Extinct Reptilia.” By H. G. Seeley, F.R.S., Professor of Geo- graphy in King’s College, London. Received October 24, 1887. Normally three elements enter into the construction of the pelvic girdle, each of which unites with the other two, and contributes to the formation of the acetabulum for the femur. The ilium and ischium are always more or less ossified, but sometimes the pubis remains represented by cartilage throughout life. Among the Amphibia the pubis is often in this cartilaginous state in its living representatives, so that only two bones and a cartilage usually contribute to form the articular cup for the femur. Among Urodeles the pubic cartilage is perforated by a foramen, which corresponds with the foramen in the ossified pubis of a lizard, and appears to carry the obturator nerve ; so that its identification with the pubis is established. But the pubis and ischium are often connate ; by which term I designate that embryonic state in which no division of the primitive cartilage into separate dements has occurred. It is not quite so evident that the similarly ©laced cartilage in certain Anura is homologous with that of Urodeles, smce it is not perforated in the same way; and it becomes smaller in ^ed specimens by the ischium encroaching upon it. It is absent in