196 DR. J. MURIE ON THE FORM AND STRUCTURE OF THE MANATEE, 
Fig. 10. Second layer of the muscles of the head, with portions of the panniculus cut 
short to show their cranial insertions. 
Te. Temporalis. 0.0. Orbicularis oris. 
Di. Digastric, seen in part. Bu. Bucecinator. 
Ma', Ma’. Masseter, two layers. D.a.o. Depressor anguli oris. 
L.l.s.an. The levator labii superioris D.1.. Depressor labii inferioris. 
aleeque nasi cut short and reflected. Pe', Pc’, Pc’. Cheek and lip insertions of 
L.s.p. Levator labii superioris proprius. panniculus. 
Cn. Compressor nasi &c. 
Px, Vascular plexus emerging from skull behind the mandibular condyle. 
Fig. 11. Third and deepest layer of cranial muscles as viewed in profile. The same 
lettering is used as in the preceding. Z, zygomaticus; MJ/d, Mandibularis 
muscle; Zy, tympanic bulla. 
Fig. 12. Muscles of face and muzzle seen from above. On the right side the levator 
labii superioris aleque nasi has been entirely removed, the dotted line 
indicating its outline. On the left side the levator labii superioris proprius 
and maxillary portion of panniculus have been dissected, cut short, and 
thrown forwards. Additional letters are:—Pn, Pyramidalis nasi; and Pz, 
infraorbital plexus of nerves, &c. 
PLATE XXII. 
Fig. 13. Pectoral limb, inner view. The upper layer of the forearm muscles in place, 
and insertions into scapula and humerus of some of the thoracic ones dis- 
played. 2h, rhomboideus; S.mg, serratus magnus; T.madé La.d, teres 
major and latissimus dorsi; P.ma &P.mi, pectorales major and minor; 
L.cl &C.h, levator clavicule and cephalo-humeral; B'd&5?, biceps, first and 
second heads; Z", T*, T°, triceps, three bellies; B.a, brachialis anticus ; 
P.y.t, pronator radii teres; F.c.r, flexor carpi radialis; Fc.d, belly and 
palmar distribution of the common flexor of the digits; F.c.w, flexor carpi 
ulnaris; P/, palmaris longus; Ad.m.d & Fb.m.d, abductor and flexor brevis 
minimi digiti; Pc, aponeurosis from panniculus. 
Fig. 14. Upper layer, short palmar muscles. Letters as in preceding. J’, superficial 
interossei; 1 to 5, the digits. 
Fig. 15. A similar view, but with the superficial muscular expanse (J*) hooked forwards, 
exposing deep interossei: Jd, deep interosseous series. 
Fig. 16. Profile feetal skull of Manatee in the Amsterdam Museum. Nat. size. Fr, 
frontal ; Ma, maxillary; Pmx, premaxillary; Pa, parietal ; So, supraoccipital ; 
Sq, squamosal; Ju, jugal, and S an adjoining sesamoid bone; Zy, tympanic; 
Md, mandible. The dotted line indicates continuance of ascending contour, 
