TRANSACTIONS OF MICROSCOPICAL SOCIETY, 
DESCRIPTION OF PLATE VIL 
Illustrating Mr. TufFen West^s paper on the Egg of Scato- 
pliaga and on the Cast Skin of an Ephemeron. 
Figs. I to 7 represent the structure of the Egg of Scatophaga. 
Fig. 
1. — Ventral as{)ect. 
2. — Lateral aspect. 
3. — The opening on side view ; p, the delicate pellicle investing the young 
larva. 
4. — Portion of the egg-case, about the middle, showing its reticulate and 
elevato-punctate structure. 
5. — Part of tip of one of the divergent appendages, to show the minute 
punctation on its surface. 
6. — Part of the dark portion of the cover, with its 4-5 angular reticulation 
and translucent spots. 
Figs. 8 to II illustrate the Notes on Cast Skin of an 
Ephemeron. 
8, — Cast skin entire, except the ends of the tails; p. ar,, pro-thorax 
m. s., mesotliorax; ni. t., metathorax; a. p., alar pellicle, &c. 
9. — Exuvise of head, under surface; a a, antennae; e e, pe, pe, eyes 
tr, tr, tracheae. 
10. — Profile view of head of an allied species; this is added as explanatory 
of the preceding figure ; similar letters apply to it, with the addition 
of 0, one of the ocelli. The grotesque appearance imparted by the 
upper pair of eyes, borne aloft on stout columns, is well seen. 
11. — End of foot, consisting of a recurved, sharply- pointed claw, attached 
to the side of a pedicellate oval pulvillus. The cast skin figured, 
when placed on a square of thin covering-glass, adhered sufficiently 
to bear removal upside down from the spot where it was obtained to 
a distant apartment. 
