1867.] J^DD — LIXCOLNSHIEE WOLDS. 227 



and tichorhine Ehinoceros, that it had an extended range from York- 

 shire, through the eastern counties, into South 'Whales and the south- 

 Trest of England, that it was very much inferior to those species in 

 point of numbers, and, lastly, that it lived in the yalley of the Thames 

 along with R, megarliinus and EJeplias jpriscus, and throughout its 

 British range with Hipjpojpotamus major. 



9. Living JRe^presentative SiDecies. — The living species that most 

 closely resembles the extinct leptorhine is the bicorn Ehinoceros of 

 Sumatra {R. Sumatranus). They agree in the suppression of the 

 anterior comhing-plate (g), so persistent in the tichorhine species, in 

 the excavation of the base of the external lamina, in the presence of 

 a third costa (Jc 3) in the upper premolar series, in the presence of 

 a cusp on the tliird collis (/)^ in the stoutness of the guard, and the 

 pyramidal shape of the colles (d, e, f) . They differ in that in the 

 Sumatran species the ^posterior combing -lolate (h) is suppressed, and 

 the guard is feeble in the upper premolars. A reference to the 

 analysis of the dental peculiarities of the other existing species of 

 Hhinoceros in the article on the megarhine Ehinoceros obviates the 

 necessity of its repetition in this place. The dentition of the 

 tichorhine agrees with that of the leptorhine Ehinoceros remarkably 

 in one point, that it is more specialized, or, in other words, more 

 closely allied to that of living species than the megarhine, — a fact 

 that seems to me to indicate that both came into being after the less 

 specialized R. megarliinus had existed for some time upon the earth. 



EXPLANATION OF PLATE X. 



Wig. 1. Bight upper milk-molar 2, nat. size. Wokey Hole. 

 2. Left lower milk-molar 3, nat. size. Wokey Hole. 



. ■ I Eight upper premolar 4, nat. size. Crawley Eocks. 



5. L^pper true molar 2, nat. size. Peckham. 



3. On the Sieata ivliicli form tlie Base of the Lixcolxshiee ^\'oli)s. 

 By JoHX W. Jtjdi), Esq.^ F.G.S. 



Contents. 



I. Introduction. c. Fossils of the Louth Eed Chalk. 



II. The Hmistanton Limestone. ! d. Other beds of Eed Chalk. 



a. Outcrop of the series in Lincoln- 

 shire. 

 h. Outliers. 

 c. Inliers. 



lY. The beds below the Hunstanton 

 Limestone. 

 a. Unconformity at the base of the 

 Hunstanton Limestones. 



• d. General Eemarks on the Hun- ; h. Succession of beds 



Stanton Series in Lincolnshire. c. The Upper Ferruginous sands, 



e. Fossils of the Hunstanton series . d. The Tealby series. 



in Lincolnshire, j e. Fossils of the Tealby Series. 



m. The beds above the Hunstanton j /. The Lower Sand and Sandstone 



Limestone. | Y. Faults, kc. 



a. General Eemarks on the Chalk of i YI. Conclusion. 



Lincolnshire. i YII. Notes on some of the Fossils. 



h. The Louth Eed Chalk. 



