61 
EXPLANATION OF PLATE I. 
Skull and Mandible of Hybodus Delabechei, Cliarleswortli; 
Lower Lias, Lyme Regis, Dorsetshire. 
Fig. 1. Side view, one-fourth natural size. fo. fontanelle. md. 
left mandibular cartilage, orb. orbit, pla. postero 
lateral angle of cranium, ptq. left upper jaw (pterygo- 
quadrate). 
„ 2. Dentition, natural size. The successive transverse 
series of teeth numbered i.—x. 
,, 3—8. Upper teeth of series v.—x., outer aspect, natural 
size, partly restored. 
