BoWELL. — Vitrhia pytenaica. 
211 
e. eye. 
r.m. retractor (penis) muscle. 
d.vJ. (really the) penis. (Sec above). 
atr. atrium. 
v.d. vas deferens. 
oe. oesophagus. 
s.g. salivary glands. 
P-g-' P-g' P^'dal ganglia. 
sth. spermatheca. 
s.d. spermathecal duct. 
{d.v.d. just below this should be deleted). 
p. and 7?. are placed on the proximal and distal parts of 
the dart sac organ. 
p.g. (below this) pedal groove. 
v.d. (under the spermatheca), vas deferens. 
J.e. " female epididymis." 
m.c. male epididymis. 
In Fig. F, besides those already explained : — 
a.gl. albuminiparous gland. 
Ji.d. hermaphrodite duct. 
In Fig. G, o.f. ovotestis. 
The large cells in this dart sac organ are ver^' much 
like those met with in flagellar dilatations, but I was too 
hasty in presuming that they afforded a kind of histological 
test. That was in fact the beginning of my error. Dr. 
Boycott has kindly permitted me to see his paper (now 
published) in MS., and I agree entirely with his conclusions. 
South Norwood, London, S.E. 
REVIEW. 
THE DUBLIN DISTRICT. 
Geological Survey of Ireland.— Sheet ii. Map to scale of 4 miles 
to one inch, reduced from the One -Inch Maps of the Geological Survey, 
1910, under the supervision of \V. B. Wright, B.A. Ordnance 
Survey Office, Southampton, 1-913. Price 2s. 6d. net. 
This clearly printed map showing the country from Baldoyle to Leighiin, 
and from the coast to Portarlington and Castlecomer, will prove 
a great boon to geological students. It is a reproduction with a few 
necessary corrections from the former work of the Geological Survey of 
the district. 
