34 DR. J. MUEIE OX 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 

 radii 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 repi'esentative of 

 adductor pollicis. 



Of the short deep muscles of the neck (see dissection, PI. 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 vertebrae. The insertions met with in the former specimen^ 

 were three dorsal vertebra and head of second rib. In this animal the rectus anticus 

 minor oficrs 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 vertebrae 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 vertebra; ; 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. 



1 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. Soo. vol. viii. p. IGl, pi. ssii. figs. 13, 14. 



= Op. cit. p. 148, pi. sxiv. fig. 29. ' Op. eif. p. 147, pi. ssiv. fig. 29. 



