Archive image from page 88 of A descriptive catalogue of the. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London .. descriptivecatal02brit Year: 1910 PELONEUSTES. 59 a little in front and behind, where probably cartilage was interposed between them. The anterior border is concave, and forms the posterior margin of the obturator foramen. The outer border is gently concave, while the posterior end is rounded. The line of the ischial symphysis in the sagittal plane makes a very obtuse angle with that of
Archive image from page 88 of A descriptive catalogue of the. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London .. descriptivecatal02brit Year: 1910 PELONEUSTES. 59 a little in front and behind, where probably cartilage was interposed between them. The anterior border is concave, and forms the posterior margin of the obturator foramen. The outer border is gently concave, while the posterior end is rounded. The line of the ischial symphysis in the sagittal plane makes a very obtuse angle with that of the pubic symphysis, so that the visceral aspect of the complete pelvic symphysis is convex dorsally in a longitudinal direction, while ventrally it is concave (text-fig. 26). The ilium (text-figs. 24, 25) consists of a much-expanded upper portion, a constricted shaft, and a massive articular head. The expanded upper portion varies in form to a Text-fig. 24. cet. acetf. Pelvis of Peloneustes philarchus: A, pelvis from above ; B, left ilium from inner side. (E. 3318, \ nat. size.) aeet, acetabulum ; , acetabular surface of ilium ; il., ilium ; is., ischium; , ischial facet of ilium ; , obturator foramen ; pu., pubis ; sacs., surface of ilium for sacral ribs. remarkable degree; probably this variation is the result of a varying degree of ossi- fication of a cartilaginous upper border, but it is possible that when we know the skull of the animal to which the ilium shown in text-fig. 25, B, belongs, it may be found to be specifically different from P. philarchus. In undoubted specimens of this species (text-fig. 25, A) the upper end of the ilium is much more expanded than in any of the Elasmosauridae. The upper border () is convex and passes into the
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Keywords: 1900, 1910, andrews_charles_william_1866_1924, archive, book, bookauthor, bookcentury, bookdecade, bookpublisher, booksubject, bookyear, british_museum_natural_history_dept_of_geology, drawing, historical, history, illustration, image, london_printed_by_order_of_the_trustees, page, picture, print, reference, reptiles_fossil, vintage
