i86 
ZOOLOGY OF THE FAR EAST 
group from the lateral body-margin of the same side. Scattered in the interspace 
between them are a sparse number of cerebral eye-spots. Further, numerous mar- 
ginal eye-spots are found completely around the body, more than one deep in the 
head region but in a single layer in the more posterior parts. 
Body-wall (pi. VIII, fig. 3). — The epidermis (ep) consists of ciUated columnar cells 
which are much higher on the dorsal than on the ventral side, and which are full of 
minute rhabdites (rh), those on the former side being much more abundant than those 
on the latter. In the median parts of the ventral surface there exist sometimes no 
rhabdites at all. Besides, numerous eosinophil glands, deeply imbedded in the paren- 
chyma, open externally in the narrow submarginal zone of the ventral surface. 
The basement membrane (bm) is very thick. The dermal musculature, which is 
1. 
Tkxt-fig. I. — Eye-spots, tentacular, cerebral and marginal, of Shelfordia annandalei. x 30. 
better developed on the ventral than on the dorsal side, consists of (i) the outermost 
circular layer (cm') of very delicate and somewhat indistinct nature, (2) the outer 
longitudinal layer (Im'), (3) the middle circular layer (cm^), of great thickness, (4) 
the inner longitudinal layer (Im'), and (5) the innermost circular layer (cm *). Dorso- 
ventral fibres (dvm) occur in all parts. 
Digestive System (PI. VIII, fig. i).— The mouth (m), situated at the commencement 
of the middle third of body, opens nearly into the middle of pharynx, which is nearly 
one-third as long as the body and is provided with about six folds of a moderate size 
on each side. The main gut (mg) is narrow but of a considerable length, and gives 
rise to numerous pairs of lateral intestinal branches, the subdivisions of which do 
not undergo anastomosis. The gut-epithelium is exceedingly poor of Minot's glands^ 
