DR. J. MURIE ON THE ANATOMY OF THE SEA-LION. 591 
Fig. 17. Anterior segment of the same side of the skull, displaying the deepest naso- 
facial muscles. The dotted line in front marks the limits forwards of the 
nasal cartilages, which were removed along with the skin; n, openings of 
nares. Letters of cut muscles apply as in preceding fig. 16. 
Fig. 18. Transverse and vertical section of the narial cartilages one inch behind the 
muzzle: w./.c, upper lateral cartilage; », patent narial orifice of left side, 
remainder closed by spring of lower lateral cartilage; a, alar cartilage ; 
sé, septal cartilage. 
Fig. 19. Reduced view of the thoracic surface of the diaphragm after removal from the 
body: ¢, central tendon; 7, right alar tendon; J, left alar tendon; v.¢c, 
opening of vena cava ascendens; , esophagus; J.c, left crus; p/, pericardial 
attachment, cut through; ao, aorta; ¢, dotted line indicating the diaphrag- 
matic tendon, which arises from the bodies of the lumbar vertebre (in the 
present case it is represented as if turned upwards or forwards). 
PLATE LXXI. 
Superficial and deep muscular layers of the spine and shoulder. 
Fig. 20. Partially dissected segment of body between the cranium and dorsal region. 
La.d. Latissimus dorsi (cut across). 
Simg. Serratus magnus. 
I.sp. Infraspinatus. 
D.ep. Dorsi epitrochlearis. 
T’. Triceps (first head), 
Rh.mi. Rhomboideus minor. 
h.c. Rhomboideus capitis. 
Las. Levator anguli scapule. 
O.h. Omo-hyoid. 
Co, Portion of complexus. 
Sp.c. Splenius capitis. 
Te’. Temporalis (first part). 
Di. Digastric. 
Ac. Auditory canal. 
Fig. 21. Same segment, but with the scapular and superficial muscles removed, and 
showing the next, deeper or third layer of thoracico-spinal muscles: Sp.d, 
spinalis dorsi; Lo.d, longissimus dorsi; S.J, sacro-lumbalis, its tendon reach- 
ing as far as the first rib; 7Z.c, transversalis cervicis tendons; C.a, cervicalis 
ascendens; img, serratus magnus, cut short, but exhibiting its costal and 
cervical attachments; Sct, supracostal muscle; Sca', Sca?, scaleni; Jt, 
intercostals; Sp.co, splenius colli; Sp.c, splenius capitis; St.m, sterno- 
mastoid. 
Fig. 22. Fourth layer of spinal muscles: Co, complexus; Bi.c, biventer cervicis; F./, 
rectus lateralis; *, trachelo-mastoid? F.a.ma, recticus anticus major; J¢r, 
intertransversalis; Ro,rotatores; 3sp,semispinalis; L.ct, levatores costarum ; 
Isp, interspinalis. 
Fig. 23. View of the skull from behind, with three whole and part of the fourth 
cervical vertebra zn situ, to show attachments of deep, short neck-muscles : 
L.p.ma, rectus capitis posticus major; R.p.mi, rectus capitis posticus minor, 
VOL. VII.—PART VIII. January, 1872. 22 
