Prof. R. Owen on rare Extinct Vertebrates. 177 



Fig. 19. D. intortus, sp. nov. 19 a, 19 b, nat. size ; 19 d, proximal por- 

 tion, magn. Glenkiln Shales, Glenkiln Burn and Wanlockhead. 



Fig. 20. D. divaricatus, Hall, sp., var. rigidus. '20a, nat. size; 20b, magn. 

 Glenkiln Shales, Birnock Water, Leadhills district. 



Fig. 21. Bryogrdptus Callavei, sp. nov. 21 a, nat. size ; 21 b, magn. ; 

 21 c, branch, magn. Shineton Shales, Shineton, Salop. Col- 

 lection, Dr. Callaway. 



Fig. 22. B. Kjcndfi, sp. nov. 22 a, nat. size ; 22 b, magn. After Prof. 

 Kjerulf ( Veiviser, fig. 6, a, &c. p. 3). 



Fig. 23. Diplograptus {Idiograptus) aculeatus, sp. nov. 23 a, normal 

 aspect, nat. size ; 23 d, ditto, magn. ; 23 b, 23 c, deprived of 

 test, lateral views, nat. size ; 23 e, 23/, ditto, magn. Lower 

 Girvan Rocks, Myoch Bay, Girvan, Ayrshire. 



Fig. 24. Lasiograptus retusus, sp. nov. 24 a, nat. size ; 24 b, magn. 2 ; 



24 c, distal portion, magn. 5 ; 24 d, proximal portion, magn. 5. 

 Upper Llandeilo, Llandrindod Wells, Radnorshire. 



Fig. 25. Diplograptus perexcavatus, Lapworth. 25 a, complete, partly 

 restored, nat. size ; 25 b, 25 c, fragments in relief, nat. size ; 



25 e, proximal portion, magn. ; 25 d, distal portion, magn., 

 showing overlapping bases of the hydrotheeas ; 25 f, ditto, 

 magn. Lower liartfell Shale (Wilsoni zone), Bobb's Linn. 



Fig. 26. D. physophora, Nicholson. 26 a, complete specimen, nat. size ; 



26 b, proximal portion, magn., showing form and mode of at- 

 tachment of proximal "vesicle." 



Fig. 27. Cryptograptus tricornis, Carr., sp. 27 a, complete specimen, show- 

 ing normal appearance of polypary (Hartfell Spa) ; 27 c, ventral 

 aspect, magn. (the lower portion is an impression only) ; 27 b, 

 reverse aspect, magn. ; 27 d, ditto ; 27 e, profile, partly restored, 

 magn. Balcletchie beds, Laggan, near Girvan, Ayrshire. 



Fig. 28 a. C. tricornis, var. Schceferi : a, nat. size ; b, proximal portion 

 magn. Upper Llandeilo, Llandrindod Wells, Radnorshire. 



XV. — On the Occurrence in North America of rare Extinct 

 Vertebrates found fragmentarily in England. — No. 3. By 

 Prof. R. Owen, C.B., F.R.S., &c. 



[Plate VIII. ] 



[Continued from ser. 5, vol. iv. p. 61.] 



Part IV. Supplements to Restoration of Lewdon anceps. 



I have been favoured by Prof. O. C. Marsh, of Yale College, 

 New Haven, Mass., with a copy of his paper " On the new 

 Characters of Mosasauroid Reptiles," based on an examination 

 of "remains of not less than 1400 distinct individuals"*. 

 Knowing the riches of the Professor's collection, I have looked 

 with much interest for the results of his examination as bear- 

 ing upon and probably dissipating any remaining doubts as 

 to the affinities and place in the Reptilian series of the huge 



* From the ' American Journal of Science,' vol. xix. (January 1880). 

 p. 83. 



