46 NEW YORK STATE MUSEUM 
Woodward gave them a graceful backward curvature. Schmidt again 
drew them nearly straight. 
A perusal of the literature suggests that this conception of the many- 
jointed composition of the chelicerae is based on doubtful evidence. 
Woodward, for example, says of P. anglicus [p. 37] that 
“three joints at least may be observed”’ and of P. bilobus [p. 57] 
‘there appear to be five joints in the antennae of this species, but it 1s 
seldom that their true line of articulation can be readily distinguished. 
Five are clearly to be seen in one of the antennae figured inthe accompany- 
ing woodcut, figure 1o.”’ Schmidt states [p. 74] “ Von den Scheerenfuhlern 
sind in meinem Material nur die letzten beiden eigentlichen Scheeren- 
glicder vorhanden, die ersten Gheder, von denen 3-5 angenommen werden, 
fehlen uns bisher.’’ Laurie [p. 516] concluded that the question of the | 
number of segments is still unsettled, and that the markings resembling 
articulations on the proximal portion may be due to crumplings of the 
undoubtedly thin cuticle, adding: “‘I believe them to have consisted 
of three segments—a long straight proximal one, and the two distal ones 
which possess the toothed pincers.” 
Laurie’s contention is corroborated by our examples. of 
P.macrophthalmus and buffaloensis and its correctness 
is suggested by the rigidly straight direction of the chelicerae in both 
the European and American species which can only mean the lack of articu- 
lation in the long arms. Finally we have also been able to convince our- 
selves of the presence of but three articulations in a fine specimen of one 
of the principal English species, P. bilobus, in the possession of the 
American Museum of Natural History. Inthis specimen both chelicerae show 
long straight well preserved basal segments without any trace of articulation 
in them, the whole chelicera being distinctly composed of but three segments. 
Another problem in regard to the chelicerae of Pterygotus not yet 
solved by direct observation is their point and mode of attachment to’ 
the cephalothorax. A glance at the restorations of P. anglicus 
by Woodward, and P. osiliensis by Schmidt, both reproduced in 
