18/9.] ANATOMY OF HY^NA CROCUTA. 107 



of place to remark that the occurrence of this divergence from the 

 usual type, so far as its female organs are concerned, in an animal 

 which in all other respects so closely resembles its fellows, may well 

 serve to demonstrate the uncertainty of any scientific classification 

 founded on any thing short of the consideration of the entire struc- 

 ture of any animal. Had the comparative anatomist examined only 

 the female organs of H. crocuta, there can be little doubt that he 

 would have established a separate genus, if not a family, for the 

 reception of the animal to which they belonged. The necessity for 

 such a course, however, is, as already pointed out, obviated by the 

 more complete examination of the structural details of the animal. 



Lastly, it might be of interest to speculate as to how in the course 

 of evolution of three species so closely allied as the three species of 

 Eyana, two of these should have conformed to the normal mammalian 

 type in every particular, whilst the third diverged so remarkably 

 from that type in respect of the structural configuration of a single 

 group of organs. Such 'speculations, however, do not come within 

 the scope of a paper devoted exclusively to a record of facts. 



EXPLANATION OF PLATES V. & VI. 



Plate V. Right side of Hymna crocuta, to show the superficial layer of muscles • 

 drawn from the recent dissection -.—G.mx., gluteus maximus, its two 

 parts; G.md., gluteus medius ; B.f., biceps femoris ; T.v.f.', tensor 

 Taginae femoris ; 8a., sartorius, " its vertical fibres forming a super- 

 ficial rectus;" T.c, panniculus carnosus; Tr., trapezius; P.,platysma • 

 Ld., latissimus dorsi ; F.m., pectoralis major ; T., triceps ; L.h 

 levator humeri ; L.s., levator scapulte ; B., deltoid. ' ' 



Plate VI. Deeper muscles, on right side of H. crocuta : G.inx., gluteus maximus 

 reflected; G.mn}, gluteus minimus, its two portions; G.rnn?, in- 

 sertion of the anterior fibres of gluteus minimus ; B.f., biceps femoris 

 reflected ; G.q^., gluteus quartus ; Sa., sartorius ; BJ., rectus femoris '• 

 O.i., obturator internus and gemelli ; Q.f., quadratus femoris ; A.h., 

 adductor brevis ; A.m..-\-s.m., adductor magnus -|- semimembranosus ' 

 V.e., vastus externus, " hooked back ; " P., plantaris ; Ga., gastro-' 

 cnemius ; F.l.d., flexor longus digitorum ; P.J., pei-onseus longus ; B.h., 

 peronseus brevis ; E.ld., extensor longus digitorum ; I'.«.-|-£'J.;i., tibia- 

 lis anticu8-|-extensor longus hallucis ; E.g., external oblique; B.a.. 

 rectus abdominis ; B.C., panniculus carnosus, cut ; Ld., latissimus'dorsi; 

 D.e., dorsi epitrochlearis ; T., triceps; T.m., teres major; S.m. ser- 

 ratus magnus; Tr., trapezius, cut; 8c}, 8c?, scaleni ; T.c, trans- 

 versalis cervicis, "its anterior slip;" 8f., splenius; L.s., levator 

 scapulae; L.h., levator humeri; B.a., brachialis anticus; E.c.r.b., 

 extensor carpi radialis brevior, " and origin of longior ; " E.cd., exten- 

 sor communis digitorum ; E.o.m., extensor ossis metacarpi pollicis ; 

 E.m.d., extensor minimi digiti ; E.c.u., extensor carpi ulnaris ; F.c.u., 

 flexor carpi ulnaris ; B., deltoid. 



