Mr Menon, Notes on tempers Larvae. 
417 
EXPLANATION OF PLATE IV. 
Fig. 1. Semper’s first larva, x 5. 
Fig. 2. Nematgcysts of same. a. small x 330 ; b. large x 200. 
Fig. 3. Transverse section of same (diagrammatic). 1 — 6, first six 
pairs of mesenteries. 
Fig. 4. Sterrogastrula of same, x 50. 
Fig. 5. Transverse section of 4. ec. ectoderm ; m. mesogloea ; 
en. endoderm mass ; vac. vacuoles ; y. yolk. The cilia 
of the ectoderm are not shown in this or in any of the 
drawings. 
Fig. 6. Transverse section of a stage later than 4. Letters as 
before, coel. coelenteron. 
Fig. 7. Longitudinal section of a still later stage. Letters as 
before, stom. stomodaeum : mes. mesentery. 
Fig. 8. Youngest specimen of Semper’s second larva, x 30. 
Fig. 9. Nematocysts of an older larva, a. small x 1000; b. large 
nematocyst x 800. 
Fig. 10. Transverse section (diagrammatic) of 8. 1 — 3, mesenteries 
(macro. ). 
Figs. 11 and 12. Transverse sections of two later stages. 1 — 6, 
the six pairs of mesenteries (macro, and micro.). 
