Karl Pearson and Adelaide G. Davin 
175 
occurs regularly in the hare, should be noted. The cases of donhh pntella recorded by Gruber {Virchow's 
Archiv, Bd xciv, S. 358, 1883) and Wright (Jourmil of Anatinnij <ind Plii/nioloijij , Vol. xxxviii. p. 05, 
1904) are comparable with each other, but not atavistic in character like those of our skiagrams *. 
Both our Figs. 28 and 30, seem to suggest the existence of posterior luiiuhie. 
Plate XIII, Fig. 29 shows two sesamoids on the face of the lateral epicondyle, possibly related to the 
lateral femoro-fibular ligament. 
Plate XIV, Fig. 31 gives an indication of a single sesamoid in much the same position. 
Plate Xr, Fig. 32. Lateral 
Fig. 33. Lateral fiibclhi with a faint trace of a second sesamoid a little below it — possibly but 
improbably a hemisesamoid of the mesial condyle. 
Plate XVI, Fig. 34. Lateral /((/^fZ/<f. This knee-joint exhibits considerable patliological ossification 
of the semilunar cartilage. 
Fig. 35. Ldtersd fabella. 
Figs. 32 — 35 are from skiagrams taken by Dr Melville at the Orthopaedic Military Hospital, and are 
reproduced from the Monograph on the Longhones of the English Skeleton, by Pearson and Bell, 
Atlas n, CI A and CI b. 
Plates XVII and XVIII. Sections of the sesamoids in Foetal Forms. These confirm Gruber's view 
that a hyaline cartilago is the necessary precursor of a sesamoid. Neither hemisesamoid nor orthosesamoid 
appears to arise from fibrous cartilage. Fig. 36. Section of lateral fahella of newly-born kitten, 
(i) Magnification 45-5, (ii) Magnification 300; showing hyaline cartilage area (dad) bordered by fibro- 
cartilage (dcd). Fig. 37. Sectinn of the ctjamclla of a newly-born kitten, (i) Magnification 45'5, 
(ii) Magnification 300 ; a — lb liyaline cartilage ; hb — cc intermediate area showing typical rounded nuclei 
of hyaline cartilage and elongated spindle nuclei of fibro-cartilage, but no threadlike nuclei of fibro- 
cytes; dd — f fibro-cartilage showing spindle nuclei and threadlike nuclei. Fig. 38. Longitudinal section 
of metatarsial sesamoid of full-term human foetus, (i) Magnification 45'5, (ii) Magnification 300, see our 
p. 159. The metatarsial sesamoid has clearly a hyaline cartilago as precursor. Fig. 39. Longitudinal 
section oi patella of full-term human foetus, (i) Magnification 45-5, (ii) Magnification 300, see our p. 159. 
The precursor of the patella in man is clearly hyaline. 
* Tillmans and Bernays had found hemisesamoidal supernumerary patellae in cadavers [Morpho- 
logisehes Jahrhuch, iv. Supplement, 1878, S. 442). Presumably these double patellae were arranged 
tandem fashion for Bernays refers to those in cats, mice, and rabbits as similar. 
