124 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 
matter of those tissues which are atrophied and undergo the regenera- 
tion of the fat benefits the organism in three ways: First, in transmitting 
that matter by means of the amcboid blood cells, which assim- 
ilate and plasmatically digest it,! essentially after the regeneration 
of grease becomes less intense, and even appears to have touched 
its limit. Second, in transmitting the matter by means of the red blood cells 
which assimilate it by absorption. Third, by means of globules of grease, 
which in themselves present certain forms whose role is to transport the 
nutritive matter into the whole body. 38. It is doubtful whether, without 
codperation of blood cells, regeneration of fatty tissues would proceed to 
complete disappearance; if it could occur it would be after a considerable 
and indefinite time. 4. The process of degeneration of muscular tissue in 
spiders, in its general traits, suggests that of vertebrate animals. 
Deduc- 
tions. 
VI. 
In the descriptive matter to which the second part of this volume is 
devoted certain terms and abbreviations are used that require explanation 
MR y MR and illustration, which it seems best to 
‘, ees Nomen- insert together at this point for con- 
ites of venience of reference. The quadrilat- 
escrip- F : 
aR “on: eral described by the middle group of 
four eyes (MF and MR) is called the 
ocular quadrilateral, or more commonly “ ocular 
. quad” (Fig. 87, oc.q), as at once a brief and 
‘or definitive term. The ocular area or eye space 
ten an sada ob hare ay, (es) is that part of the face over which the eight 
clypeus; es, eye space; MF, MR, eyes are distributed. The curvature of the eye 
midfront and midrear eyes; SF, P 
SR, sidefront and siderear eyes; TOWS forms an important characteristic in deter- 
SP OOMAr quate Si VEER: mining species. The rows are said to be pro- 
curved when the concavity is directed forward toward the mandibles, and 
recurved when the concavity is directed backward. When the row is 
straight, or nearly so, it is said to be “aligned,” or nearly so. In deter- 
mining the curvature the 08 
eer eye rows have been looked © ©) E2e D 
at from the front, and a little be- Y 
low the horizon of the front row. ite cas > tesa, Pie. caer 
It is often difficult to determine the CURVATURE oF EvEs. 
exact curvature, especially as it dif- 7g, @, Prost rom rere, Fons row promurye, 1 
ers with the point of vision. In _ Slightly recurved, rear row procurved. 
Fig. 88 the front row of eyes is recurved, the rear row slightly procurved ; 
in Fig. 89 the front as well as the rear row is procurved; in Fig. 90 the 
front row is nearly aligned, the rear procurved. 
1See Wagner, “Du Sang des Araignées.” 
