A NEW CUTANEOUS PARASITE, THE ENTOZOON FOLLICULORUAI. 
319 
men is remarkable for the abundance of cells contained in its interior; it 
measured ^ of an inch in length. 
Fig. 26. A more advanced stage of growth, rudiments of a fourth pair of legs being 
perceptible. The animal measured - 8 y- of an inch in length. 
Fig. 27. The most advanced gradation of the six-legged young. The head is yet 
very imperfect, as are the fourth pair of legs. This specimen measured 
of an inch in length. 
Figs. 28, 29. Forms which the young animal assumes when it contracts its thorax 
and withdraws its head. Fig. 28 is the animal represented in figure 26. 
Fig. 30. A young animal with four pairs of legs casting its exuviae. This specimen 
measured -yy of an inch in length. 
Fig. 31. The ordinary form of the four-legged young of the long variety. The speci- 
men measured^ of an inch in length. 
Fig. 32. The same animal turned a little to one side. 
PLATE XVII. 
Fig. 33. An animal approaching maturity. Its perfection is indicated by the fig'ure 
and segmented structure of the thorax. It still, however, retains the long, 
taper and cylindrical abdomen of the imperfect forms. This specimen 
measured 5^ of an inch in length. 
Fig. 34. A mature form, somewhat contracted in length and unusually full of nucle 
ated granules. The specimen measured - 8 -y- of an inch in length. 
a. The anal aperture. 
Fig. 35. The smallest young animal of the short variety I have yet examined ; it re 
sembled an ovum from which legs were in progress of development. It 
measured only y^g- of an inch in length. 
Fig. 36. More advanced form ; the lines indicating abdominal segments were appa- 
rent on this specimen. It measured in length -yyy of an inch. 
Fig. 37. An animal undergoing the exuviating change. Its cellular structure is shown. 
It measured ^^-5 of an inch in length. 
Fig. 38. - A more advanced stage ; the absence of phalanges in all the figures is a pro- 
minent feature. They are all cellular in structure. This specimen measured 
yyy of an inch in length. 
Fig. 39. The young state of the perfect animal of the short variety. This specimen 
is enclosed in its exuviae ; it measured yyy of an inch in length. 
Fig. 40. The young state of the perfect animal ; the abdomen is perfect, but the legs 
are rounded and without phalanges. This specimen measured yyy of an 
inch in length. 
Fig. 41. A portrait of the texture of a young specimen of the present form. It is not 
drawn to the scale. 
Fig. 42. A perfect form of the short variety. The animal is turned a little upon its 
side ; it measured yyg- °f an inch in length. 
mdcccxliv. 2 T 
