MUSCLES OF HEAD AND NECK. 115} 
A flat strand of muscle from 2 to 5 mm. wide (Plate 4, fig. 1, e) arises from 
above the articulation of the 14th rib on each side and passes forward for about 
60 mm. to become inserted into this great tendinous sheet some 30 mm. posterior 
to the axilla. This appears to be the dorso-cuticularis, and is apparently nar- 
rower than in Gymnura or Potamogale. 
MUSCLES OF HEAD AND NECK. 
Compared with Centetes, Gymnura, or Potamogale, the anterior muscles 
of the snout seem to show less complexity in Solenodon, but resemble more 
nearly those of Myogale as figured by Dobson, whose specimen of Solenodon 
cubanus was in too poor a state of preservation to permit of exact determination 
of these muscles. 
The platysma myoides is a flat superficial muscle, well developed and firmly 
attached to the skin from the lambdoid crest forward along the sides of the face 
and lower jaw. 
The zygomaticus major (Plate 5, fig. 1, b) is a relatively small muscle arising 
from the bony ledge of the antorbital pit just above the last premolar. It 
passes into a small round tendon at about the level of the anterior incisors, and 
running just to one side of the midventral line, inserts on the ventral portion of 
the tip of the cartilaginous proboscis. Its action is to depress the snout, but it 
evidently is of limited use, as the vertical play of the proboscis is not very great. 
The levator labit swperioris proprius (Plate 5, fig. 1, c) is a large muscle 
attached along the entire anterior edge of the orbit from the ventral border of 
the eye nearly to the dorsal line. It passes forward as muscle to the tips of the 
nasals where it becomes a flat tendon and runs to the tip of the proboscis below 
the median line. 
The levator labit superioris et erector vibrissarum (Plate 5, fig. 1, a) originates 
anteriorly to the orbit, between the two muscles just described and ectal to the 
opening for the facial nerve. It is likewise more or less firmly attached to the 
antero-lateral face of the maxillary where it breaks into numerous small thread- 
like tendons that pass to the bases of the vibrissae with which the snout is 
well supplied. These fibers are firmly united by investing tissue and muscular 
strands to the side of the cartilaginous proboscis, to which they are undoubtedly 
able to impart a slight lateral motion. Ventrally this muscle is closely con- 
nected by tendinous tissue to the orbicularis oris. It is richly supplied with 
nerves. 
