133 
Notes on some of the Chief Muscles of the Head and some Glands. 
Owing to my sudden departure from England in 1912, my de- 
scription of the anatomy of Geotria was brought to a standstill at a 
very early stage and I was not even able to complete my examination 
of the musculature. Other work commanding my attention in India 
and zoological libraries being conspicuous by their absence, these 
notes on the muscles must remain as they are. I publish them because 
I believe that they, and especially the figures, will prove of use in 
supplementing the description of the muscles of Petromyzon provided 
by P. Firprineer (12); also because the muscles of Geotria exhibit 
some differences. 
I must also state that in my description I have of course re- 
tained P. FÜRBRINGER'sS names for the muscles, despite the fact that his 
terminology of the skeleton is very different from that now in vogue 
and employed by me (as being non-committal in reference to any 
theory of the ancestry of the Marsipobranchs). It is perhaps hardly 
necessary to compare the old and new terms applied to*the various 
parts of the skeleton but nevertheless, to prevent possible confusion, 
I will here enumerate the names of those parts of the skeleton the 
modern terminology of which differs from that formerly employed 
and add after each (in brackets) the corresponding term employed 
by P. Firprincer:—Anterior Dorsal (semi-anularis), Posterior Dorsal 
(ethmoid), Anterior Lateral (lateral), Posterior Lateral (rhomboid), 
Styliform (processus spinosus), Median Ventral (copula), Anterior 
Pillar of the Subocular Arch (palatine), Posterior portion of the Sub- 
ocular Arch (quadrate), Styloid Process (hyomandibular), Cornual Pro- 
cess (hyoid), Piston (present author’s term), Cartilage (lingual cartilage). . 
If we remove the skin from the side of the head of Geotria, the 
structures shown in figure 19 come into view. The most conspicuous 
of these are the greatly developed anularis musculature (VJ) of the 
buccal funnel, the large blood-containing cavity of the gular sac (G.S.) 
with its muscular walls, the dorsal (indicated by III, IV and V) 
and sub-branchial (indicated by J and II) myotomes, the eye, a 
small glandular mass (G.E.E.) situated just above and in front of 
the eye, the basilaris muscle and its derivatives (VII—X) placed 
immediately in front of this and the gill-apertures (G.A.) situated in 
a groove. The gular sac I have already mentioned in connection 
with the external characters, This figure well shows its great capacity. 
Those dorsal Myotomes, the normal ventral extension of which has 
