DESCRIPTION OF PLATE XI. 



Fig. I. — The head detached and viewed from behind : t.a. = tergal alse ; s.a. = sternal 

 alae ; mxp. = maxilliped ; m. = ventral muscle close to its insertion into the 

 cephalon : natural size. 



Fig, 2. — The same viewed from above, the dorsum being partly removed : p. = pharynx ; 

 o.n. = the optic nerve ; n. i a. = nerve to ist antenna ; n. 2 a. = nerve 

 to 2nd antenna ; e. = the eye ; m. 2 a. = muscle of 2nd antenna ; d.p. = 

 dilator muscle of the pharynx ; s.g. = the salivary gland ; g. = cephalic 

 groove ; t.g. = groove separating anterior and posterior portions of sternal 

 alae ; / /. = fibrous union between right and left halves of sternal alae ; 

 s.o.g. = the ist thoracic ganglion : x 2. 



Fig. 3. — The same viewed from the side : a. 1 = gap exposed by removal of the ist 

 antenna, beneath it is a similar gap for the 2nd antenna ; /./. = frontal 

 lamina ; c. = clypeus ; lb. = labium ; a.t. = antennary tubercle ; p — a pit 

 in which the downward prolongation of the cephalic groove g. comes to an 

 end : natural size. 



Fig. 4. — View of the nervous system after removal of the alimentary canal : s.o.g. = 

 ist thoracic ganglion ; g.t. 1 = the 2nd thoracic ganglion ; g.t. 7 = ist abdom- 

 inal ganglion ; g.a. i = 2nd abdominal ganghon ; — the lettering in the 

 figure is erroneous ; h.g. = hind gut : natural size. 



Figs. 5 — -8. — Various views of the gizzard : 0. = oesophagus; p.a. =posterior ampulla; 

 a.a. = anterior ampulla; u.v.p. = upper valvular process; l.v.p. = lower 

 valvular process; (i ^. a. = depression forming the posterior ampulla; 

 d.a.a. = depression forming the anterior ampulla; d. = depression forming 

 the upper valvular process; t.r. = transverse ridge (ossicle); t.c. = 

 thickened cuticle. Figure 5 is from above; fig. 7 from the side; fig. 8 

 is a view of the inner surface of the organ after division in the mid line ; 

 fig. 6 is a transverse section of half of the organ at the level s.s. in fig. 8 : 

 all X 2. 



