PLATE 59. 



Fig. 1-2. Squalus acanthias. M. C. Z. 35 (Page 192). Fig. 3. Ginglymostoma cirr 

 M. C. Z. 819 (Page54). Fig. 4-6. Chlamydoselachus anguineus. M. C. Z. 1247, 1285 (Pap 

 Fig. 7-8. MoBULA HYPOSTOMA. M. C. Z. 683 (Page 453). Fig. 9-10. Rhinoptera ju> 

 M.C. Z. 863 (Pago 447). 



Figure 1, 7 natural size, and fig. 2, natural size, exhibit the outer and the internal yolk-s. 

 heart with arteries, the liver, the stomach, and the intestine. Figure 3, xV natural length, isthi 

 Ginglj'niostoma, the embryo showing through the shell. Figure 4-5, f nat., show the egg wi 

 embryo of Chlamydoselachus. Fig. 7-8 show the appearance of the gill plates of Mobula, ;i 

 9-10 those; of Rhinoptera. There is in the latter a longitudinal division of the plates into upi' 

 lower parts, in fig. 9 there are also seen modifications to some extent intermediate in character bi 

 the plates in fig. 10 and those of Mobula. 



Figure 6, of Chlamydoselachus, was made for comparison with the type and with figures i: 

 recent articles by Fiirbringer and Goodey. In a number of points it is at variance with the figun 

 tioned and agrees more nearly with the type. There is no point behind the middle of the first ba 

 as in Fiirbringer, 1903, Morph. jahrb. 31, pi. 27, f. 18 or in Goodey, 1910, Proc. Zool. soc. Lond., 

 f. 6 "bbr. 1 (?)." The basibranchials are more numerous and regular than in either of the meii 

 figures. The hypobranchials are present in five pairs, the hindmost pair being displaced and 

 below the junction of the sixth ceratobranchial and the basibranchial; these cartilages are those i 

 as the vestigial seventh arch, Goodey, loc. cit., pi. 43, fig. 6, "b a 7 (?)." The seventh arch w 

 covered and figured by Fiirbringer, 1903, as an ''eventuel Rudiment einer siebenten Kiemenbu 

 it is of much greater development in this Plate than in either of the other figures. 



