60 ANATOMY OF MEGAPTERA LONGIMANA. 



Figs. 13 and 14. Pectoral fin of the 64-feet-long B. musculus, 

 reproduced from this Journal, 1871, for comparison with that of 

 Megaptera ; and for the muscles, flexor and extensor. Reduced to -^. 



Fig. 15. The pelvic bone and femur and their muscular and fibrous 

 connections in this male Megaptera longimana ; reduced to i. The 

 dissection carried deeper on the left side. P, pelvic bone ; F, femur. 

 The dotted line shows the position of the right pelvic bone ; a, great 

 interpelvic ligament, at its attachment to pelvic bone ; 6, part of 

 levator ani muscle ; c, part of the caudal muscular mass ; d, trans- 

 versus perinei muscle, only the posterior border seen ; e.e., retractor 

 penis muscle, right and left ; /, ischio-cavernosus muscle, lying on 

 interpelvic ligament and crus penis. The dotted lines show its position 

 covered by the interpelvic aponeurosis ; the inner dotted line shows 

 its line of termination on the under aspect of the corpus cavernosum 

 penis ; g, attachments of caudal muscular mass to pelvic bone and 

 interpelvic ligament ; A, prolongations of its tendon to the femur and 

 along outer side of pelvic bone ; i.i., attachments of anterior muscular 

 mass to pelvic bone, in Megaptera only by tendon ; k.k., great inter- 

 pelvic and interfemoral aponeurosis ; I, posterior ligament of femur, 

 bifurcated. A portion of the internal limb is seen on the right side ; 

 m, external ligament of femur ; n, femoral prolongation band. On 

 left side the thinner lateral parts of that band removed, showing o, 

 separate part attached on deep aspect of femur and joined by part of 

 tendinous prolongation from caudal mass. 



Fig. 16. Pelvic bone and femur and their ligaments reduced to . 

 The right femur is seen to be larger than the left. The letters refer 

 to the same parts as in fig. 15 \ r.m.j on right side, retractor femoris 

 muscle, contained in the inner limb of the posterior ligament. 



