292 COLE 
Family PYCVOGON/IDA. 
Chelifori and palpi both absent; ovigera present in the male only 
Genus Pycnogonum Briinnich (1764). 
Trunk stout and square-set. Ovigera small, present only in the male, 
g- or 10-jointed. Legs comparatively short, stout, tapering. First tarsal 
joint small; claw powerful; auxiliary claws usually absent. 
Remarks.—There seems to be a disagreement among authors as to 
whether in this genus the ovigera are g-jointed or 1o-jointed. This is 
probably due to the fact that some count the terminal claw as a joint, 
while others do not; but as it differs from the others only in being smaller 
and more chitinous, I see no reason why it should not be considered a 
joint the same as the terminal claw of the legs. 
PYCNOGONUM STEARNSI Ives. 
Plate xiv, figs. 13-15; plate xxv, fig. 10. 
Pycnogonum stearnst IVES, '92, p. 142, pl. X, figs 1-4. 
Trunk broad, somewhat depressed ; lateral processes with scarcely any 
interval between them. Each trunk segment with a prominent tubercle 
at its posterior border on the mid-dorsal line (considerably smaller on the 
last segment), and a somewhat smaller tubercle on the outer edge of each 
lateral process. First trunk segment about two thirds the length of the 
proboscis, slightly constricted just ahead of the lateral processes; second 
and third segments each equal to the portion of the first back of the con- 
striction; the fourth somewhat shorter. Posterior borders of the 
segments slightly elevated. 
Caudal segment clavate, or nearly cuneiform, truncated at its ex- 
tremity, sometimes slightly swollen in the middle; somewhat longer than 
the fourth trunk segment, about equal to the third. The anus is a 
longitudinal slit on the ventral side of the caudal segment near the tip. 
Eye tubercle bluntly conical, placed just behind the constriction of the first 
segment ; eyes black or dark brown, distinct, or in some cases indistinct and 
without pigment; the posterior pair usually farther apart than the anterior. 
Proboscis subcylindrical, slightly swollen at or a little anterior to the 
middle; somewhat longer than the first trunk segment. 
Ovigera (pl. xxv1, fig. 10) small and rather slender; ro-jointed, the last 
joint a strong, straight, or nearly straight, claw. The joints do not 
diminish gradually in length; the first, second, fourth, seventh, and 
eighth are approximately as long as broad, while the others are propor- 
tionately longer. The diameter does not decrease greatly until the ninth 
