Karl Pearson and Adp:laide G. Davin 
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Fig. 57 b. Photograph of the posterior aspect of the right pelvic limb of Fiber zibetliicus, the 
Musquash, showing internal ((./.) and external {e.f.) fabellae together with a posterior external lunula 
(p.e.l.). Compare Figs. 61 a and 61 b. 
Plate XXIV, Fig. .58. Drawing of posterior aspect of left pelvic limb of Lepus cuniculus, the Common 
Rabbit, showing large external {e.f.) and smaller internal (i.f.) fnbellac and cyamella (cy.). The rabbit 
has usually (?) two anterior lunulae as well, but not in this specimen. 
Fig. 59. Drawing of lateral aspect of left pelvic limb of Potamogale velox from West Africa, showing 
the external fabella (e.f.). No sign of ossification in popliteal tendon. Fibula fused with tibia at 
distal end. 
Fig. 60 a. Drawing of posterior aspect of left knee-joint of Paraxerus jacksoni, African Squirrel, 
showing external {e.f.) and internal (i./.) fabellae, together with cyamella (cy.). 
Fig. 60 b is the anterior view of the same knee-joint showing an internal anterior lunula (a.i.lu.). 
Fig. 61 a and Fig. 616. Drawings respectively of the posterior and anterior aspects of the right knee- 
joint of Fiber zibethicus, the Musquash or Musk Eat. The former shows the internal (if.) and external 
(e.f.) fabellae with a posterior external lunula ; the latter besides the two fabellae shows external [e.a. hi.) 
and internal (i.a.lu.) anterior lunuhie, but no cyamella was present. Cf. Plate XXIII, Fig. 57 b. 
Fig. 62 a and Fig. 62 6 provide drawings of the posterior and postero-lateral aspects of right pelvic 
limb of Hylomys suillns dorsalis, a Tree Shrew from Borneo. Only internal (i.f. ) and external (e.f. ) fabellae 
were found. 
Fig. 63 a and Fig. 63 6. Drawings of the anterior and posterior aspects of the knee-joint of Tracliy- 
saurus rugosus, the Australian stump-tailed lizard. The former shows at a' the lateral anterior lunula, 
and at 6' the mesial anterior lunula ; the latter gives a the mesial and 6 the lateral posterior lunula, and 
the cyamella as indicated. The cijamella is on the anterior corner of the fibula, but is seen in both 
posterior and anterior aspects. The four lumilae all lie between tibia and femur, the cyamella between 
fibula and femur. 
Fig. 64 a and Fig. 64 6. Drawings of the posterior and anterior aspects of the right knee-joint of 
Varanus niloticus, the Nile Monitor. The former shows internal (p.i.lu.) and external (p.e.lu.) posterior 
lunulae and the latter external (a.e.lu.) and internal (a.i.lu.) anterior lunulae as well as a large cyamella 
or better parafibula (paraf.) on the head of the fibula. This parafibula has tendon in the popliteal groove 
and is also attached to the head of the fibula ; it lies just internal to the attachment of the external 
lateral ligament as shown in the drawing (Fig. 64 6). It will be seen that the cyamella is entirely 
anterior and this position is in partial agreement with that of Tracliysaurus rugosus, which, however, is 
also visible from posterior as well as anterior aspect. Cf. Figs. 63 a and 63 6. 
Fig. 65 a and Fig. 65 6. Drawings of the anterior and posterior aspects of the left knee-joint of 
Amphibnlurus barbata. The former shows two anterior lunulae, a small internal one (a.i.lu.) and a larger 
external (a.e.lu.) or rather mid-trochlear lunula. The latter shows an external (p.e.lu.) and an internal 
(p.i.lu.) posterior lunula ; both are on top of the tibia and the external is the larger. There is no trace 
of a parafibula. 
Plate XXV, Fig. 66. Photograph of the right knee-joint of Megatherium cuvieri or the Fossil Giant 
Sloth, in the Royal College of Surgeons' Museum. The photograph shows a sesamoid on the top of the 
fibula, which has usually been described as a lateral fabella. It lies close to the popliteal groove and 
there is little doubt that it is a cyamella. (cy.) or rather parafibula. On the top of the tibia is a second 
sesamoid which we have not hitherto seen referred to. It is undoubtedly an external anterior lunula 
(a.e.bi.). It lies externally from the base of the large patella (pa.). 
Fig. 67. Photograph of the left knee-joint of Manis aurita, the Chinese Pangolin. The knee-joint 
has been opened out for the purpose of photography, but the cyamella (cy.), usually described as a 
fabella, appears to have been mounted in the right position. When the knee is flexed the sesamoid does 
not lie on the top of the external condyle, but on the top of the fibula ; it is a parafibula, articulating 
with both fibula and the posterior face of the external condyle. 
Plate XXVI, Fig. 68. Drawing of the posterior aspect of left knee-joint of Simia satyrus, the Orang- 
utan, showing the cyamella (cy.) in position in the popliteal tendon. Inset, drawings of three cyamellae 
from three Orang-utans' knee-joints dissected in the Biometric Laboratory, posterior and anterior aspects, 
