712 
EDWARD W. SHANN. 
parallel to the surface of the lobe which they subtend. In 
the centre of the lobe there is a fatty tissue {F.t.'); the 
connective tissue here is loosely and irreg’ularly arranged to 
allow space for the fat-globules. The latter have been 
dissolved by the action of alcohol in the preparation depicted 
in fig. 3; they will be described later when fig. 5 is examined. 
The accessory scale {Sc. A.), can be seen as a band of 
refringent substance running parallel to the vertical outer 
wall of the lobe throughout its entire height. It is 
surrounded by a scale pocket {Sc. 2').). A normal body-scale 
{Sc.) is also shown in fig. 3 ; on comparing the accessory scale 
with this, it is seen that the former is very much the larger, 
but does not show the characteristic concentric markings. 
In thicker sections from this region of the lobe a few lai’ge 
pigment-cells were observed embedded deep in the outer 
vertical wall. 
Fig. 4 represents a transverse section taken through the base 
of the adipose lobe quite close to its origin, where it is scarcely 
to be distinguished externally from the body-wall. Two scales 
{S.c.) are seen lying in their pockets {Sc.p.), close beneath 
the outer wall. The accessory scale {Sc. a.) is cut close to its 
root, and appears shorter and thicker than in the section 
shown in fig. 3 ; the arrangement of the tissues is similar in 
the two sections. Near the inner aspect a round space is 
seen {Sp.h.)-, this is due to the removal of the bony splint 
(Text-fig. 1, Sp.) which supports the adipose lobe. It Avas 
noticed above, under the description of the dissection of the 
lobe, that the splint lay in a pocket of connective tissue ; now 
in the section, the hole {Sp. h.) is seen to be surrounded by 
concentric stands of connective tissue, which give it the 
appearance of a scale-pocket. This resemblance will receive 
further notice in the section on homology. 
Proceeding towai’ds the middle of the length of the lobe, 
where it is entirely free from the body-wall, we obtain a cross 
section which is still roughly triangular; such a section is 
shown in fig. 5. The outer vertical wall (0.), is approxi- 
mately straight, the dorsal angle (D.) is acute, the ventral 
