Thompson. — Metamorphoses of Hermit Crab 
PLATE 7. 
As before Roman numerals indicate‘thoracic limbs and abdominal segments 
and subscripts mark the stages. 
Fig. 20. 
Fig. 27. 
Fig. 28. 
Fig. 29. 
Fig. 30. 
Fig. 
31. 
Fig. 32. 
Fig. 33. 
Curves showing amount of variability and range of variations m 
sixth-stage larvae. The ordinates indicate the conditions of rearing; 
the abcissae the percentages. Continuous line = amount of varia¬ 
bility ; broken line = range .of variations. Conditions are: nor, 
normal; net, naked ; sin , sinistral ; ind, indifferent. See page 189. 
Part of abdomen, first zoea; living material, showing ganglia and 
nerves. 
Development of ophthalmic scale. a, first antenna; e, eye. 
Ventral surface of infra-oesophageal ganglion, adult, ar, ascending 
arterioles; comm , thoracic commissures; oes, oesophageal commis¬ 
sures ; st a, sternal artery. 
Eupagurus pollicaris ; abdominal ganglia to show arrangement of 
these parts in the genus Eupagurus. gn , ganglionic nerve from fifth 
ganglion; comm n , commissural nerve from fourth commissure; 
cp , columella prominence ; nv , nerve to fifth thoracic limb.. 
Development of telson and uropods; 31 15 31 2 , and 31 4 show the 
ventral, the others the dorsal surface. Drawn to common size, nr, 
anlagen of uropods. 
Curves showing duration of the glaucothoe stage, normal and delayed. 
Ordinates represent days, abcissae percentages. Continuous line = 
A, normal; broken line = Bl, delay of three days; dotted line = B2, 
delay of four days. 
Same, naked and sinistral. Continuous line — C, crabs kept with¬ 
out shells; broken line= E, sinistral shells ; dotted liner= A, plotted 
with the day and half day percentages added together. 
