a4 DR. J. MURIE ON THE MANATEE, 
occasion, excepting that there is an additional single belly to the radial side of the fifth 
digit. 
To the ulnar side of the superficial interossei there is another pair of muscles, which 
spring together from the cuneiform bone (ulna?), and pass on to the fifth digit, being 
inserted palmad respectively on the radial and ulnar edges. These may represent an 
opponens minimi digiti and abductor minimi digiti. I have already recorded* the pre- 
sence of a flexor brevis and abductor minimi digiti in the Manatee; but these muscular 
aponeurotic bands were not nearly so clear and well defined as in this Aquarium 
specimen. 
Absent entirely in the former instance, there is in this only one short muscle to the 
thumb. This arises from the fascia covering the end of the tendon of the pronator 
yadii teres and flexor carpi radialis muscles, and it occupies the metacarpal bone its 
whole length. The muscle may either be a flexor brevis pollicis or representative of 
adductor pollicis. 
Of the short deep muscles of the neck (see dissection, Pl. VIII. fig. 5) the rectus 
capitis anticus major has the usual cranial origin; and the two muscles of opposite 
sides thence diverge backwards, each with a thick fleshy belly flattened gradually pos- 
teriorly. A tendon of insertion is fixed to the transverse process of the fifth cervical 
vertebra, and partly to the sixth. Another middle-placed tendon goes on to the head 
of the first rib ; and still another, innermost and broadest, is fastened to the body of the 
first dorsal vertebra, there mingling with the periosteal fascia covering the bodies of 
that and the succeeding vertebre. The insertions met with in the former specimen” 
were three dorsal vertebra and head of second rib. In this animal the rectus anticus 
minor offers no variation worthy of mention. 
The longus colli I again found well developed, flat, tolerably muscular, and divisible 
into three portions. The first division, taken in the order formerly described®, com- 
prises fibres chiefly directed from without inwards, which pass between the transverse 
processes of the fourth, fifth, and sixth cervicals, some odd tendinous slips going to the 
first dorsal. The second division partly overlaps the third, and is inserted by short 
tendons into the extremities of the third and fourth vertebre and root of the fifth. 
Division third of the two sides arises in proximity from the atlas ; but they afterwards 
leave a fusiform space between them. Each moiety covers the body and transverse pro- 
cesses of the cervical vertebre ; and a flat broad tendon is continued over the body of 
the first to the anterior edge of the second dorsal. This multiple-bellied neck-muscle 
only shows variety in slightly more extensive attachment than formerly noted. 
I here find the rectus lateralis separate as a broad strong fleshy band extending from 
the occiput and root of stylo-hyoid to the transverse process of the atlas. The obliquus 
superior ?, lying within the last and deeper, is a small muscle which passes from the 
? Trans. Zool. Soe. vol. viii. p. 161, pl. xxii. figs. 13, 14. 
? Op. cit. p. 148, pl. xxiv. fig, 29. * Op. cit. p. 147, pl. xxiv. fig. 29. 
