Biometrika, Vol. XIII, Parts II and III 
I'ciirsuii ■X; l)aviii, Si:ui///o/iis 
Plate I 
Fig, 1, First iittempt at illustration of the fnht'lhw in the two heads of gust roriicii: iiix. 
Fioin Casseiius' Tabulae (Uialomirai', l(j32. 
Fig. 3. Fahcll(( liiti-r((li^ as figured by Gillette, 1872. 
See description of plates. 
