SCHn.TK, SKI WIIALK. 



Fig. 9. Section of carpus. Camera lucicla tracing. 1, 

 Radius. 2, Ulna. 3, Pisiform. 4, Radialo. 5, Intermedium, 

 6, Ulnare. 7, Carpale 1. 8, Carpalia 2 and 3. 9-12, Meta- 

 carpalia 2-5. 



I, 1 is represented by a very minute cartilage at the preaxial border of the metacarpus inter- 

 posed between the radiale and the metacarpal of 

 digit II, with which latter it is partially fused. 

 A second element of this row is of larger size. 

 Proximad it articulates with radiale and inter- 

 medium, distad with the metacarpalia of digits II 

 and III, by its postaxial border with the fourth 

 metacarpal. This element is imperfectly separate 

 from metacarpale II. It probably represents the 

 fused carpalia II and III. 



I)i(/itx: In all the metacarpalia are assimi- 

 lated in form to the phalanges. Those of digits 

 IV and V articulate with elements of the first row 

 of the carpus; metacarpale IV with the interme- 

 dium and ulnare, metacarpale V with the ulnare 

 and pisiform. There is no sign of a first digit. 

 The number of elements in each digit, the metacarpal included, is as follows: II-4; III-7; IV-7; 

 V-4. 



Pelvis: The os innominatum is embedded in the junction of the ischio-caudalis and the 

 rectus muscles, so that only the pubic region is exposed in ventral view, and this is situated 

 close to the lateral margin of the neuro-vascular foramen in the latter muscle. The extremities 



of the ilia are connected by ligaments, the prepelvic 

 bands of Struthers, 2 to the termination of the linea 

 alba. In shape the -innominate bone resembles that 

 of B. rostrata figured by Eschricht 3 more closely than 

 that of B. borealis in Struthers' illustration. 4 The 

 ilium is slender and rod-like, the ischium expanded 

 and dorso-ventrally flattened. Entally the two por- 

 tions fall into one continuous curve, while ectally the 

 region of junction is marked by the small projection of 

 the pubis. The total length of the cartilage is 9.5 

 mm.; the breadth of the ischium is 2 mm., that of the 

 ilium about half as much. The ischia of the two sides 

 are separated by an interval of 10 mm., the tips of the ilia by a distance of 6 mm. There was 

 no femoral cartilage. 



Fig. 10. Pelvic rudiments. 2X nat. size. 1, Ilium. 

 2, Pubes. 3, Ischium. 4, Insertion of rectus abdominis. 

 5, Origin of ischio-caudalis. 6, Origin of ischio-cavernosus. 



' Leboucq, H. Recherches sur la morphologic de la main chez les mammifercs inarms, Pinnipedes, Sireniens, Cetaces. Arch, de 

 Biol ., T. IX. ' 1889, p. 571. Cf. pi. xl, figs. 50-52. 



'- Struthers, John. On the rudimentary hind limb of a-great fin-whale (Balasnoptera muscul 13) m comparison with those of the hump- 

 back and the Greenland right-whale. Jour. Anat. and Phys, N. S., Vol. XXVII, 1893, p. 293. 



Eschricht, D. F. Untersuchungen iiber die nordischen Waltiere, I. fig. 42. Cf. Abel, O. Die Morphologie der Huftbeinrudimente 

 der Cetaceen. Denkschr. der Akad. der Wiss, Math.-Naturw. Klasse, Bd. 81 . 



4 Id. Plate XX, Wien 1908, Fig. 7. 



