Olson • THE EXTINCT HAWAIIAN GENUS C1RIDOPS 
663 
FIG. 5. Hindlimb elements of Ciridops (A. B. C) compared with Vestiaria coccinea (D. E. F) (USNM 553205). (A) 
Ciridops xp., fossil from Oahu (USNM 255124. image reversed to facilitate comparison): (B, C) Ciridops anna (MCZ 
10995). Groupings are femora in posterior view, tibiotarsi and tarsometatarsi in anterior view. Note the shorter but much 
more robust limb bones in Ciridops. 
iliac crest, to which also were strongly attached fibers 
from the cranial portion of M. iliolibularis (Fig. 6)— 
unlike either VC or HS. The origin extended as a 
broad aponeurosis over Mm. iliotrochantericii 
(Fig. 6B). Fleshy fibers did not approach the iliac 
crest except in the anterior 2.5 mm, where the origin 
was almost fleshy. The width of this muscle at its 
origin was 13.0 mm. as in VC'. 
M. iliotroclumtericus caudciUs (Fig. 6D).—This 
muscle was strikingly different in Ciridops. being 
much larger with a distinctly squared posterior 
margin (Fig. 6D), causing the cranial portion 
of the iliac shield to assume a conspicuously 
different shape (Fig. 4) as compared with VC or 
HS. A portion of this muscle in Ciridops extended 
into the gap between the corner of the iliac crest 
and the antitrochanter, unlike the other genera 
compared. With its greater area and thickness, this 
muscle easily had twice the volume of that in 
either VC or HS. The tendon of insertion was 
considerably stronger and extended farther cau- 
dally than in those genera, leaving a deeper scar 
on the femur. 
Mm. iliotroclumtericus cranialis et medius — 
These muscles were essentially similar to those of 
VC and HS hut were larger and more robust. The 
origin of M. iliotrochantericus cranialis was more 
extensive posteriorly in Ciridops. 
Mm. femorotibialis externus et medius .—These 
fused muscles did not differ greatly from those of 
VC or HS but some of the fibers of the externus 
originated farther proximally, about half way up 
the shaft of the femur, possibly correlated with the 
shortening of the femur. 
M. femorotibialis interims .—Similar to VC and 
HS but larger and considerably thicker. 
M. iliofibu/ciris .—The origin in Ciridops ap¬ 
peared proportionately shorter but was more 
aponeurotic: the belly w-as larger and thicker than 
in VC or HS. 
M. flexor cruris lateralis.—The posterior por¬ 
tions of both pars pelvina and pars accessoria had 
been disturbed in skinning. Differences from VC 
and HS w'ere difficult to detect, but the insertion 
seemed to extend farther mediad and distad. 
M. caudiliofemoralis .—The belly had been cut 
in skinning and the origin was lacking. The 
muscle was similar in size and position to that in 
VC or HS but the insertion was more distad (the 
gap between the tendons of insertion of M. 
