76 ICHTHYOPTERYGIA. 



on p. 55 of his ' Beschreibung des Ichthyosaurus trigonodon,' 

 refers most of a the skeletons of Ichthyosaurs from the 

 Upper Lias of Wiirtemberg and Banz in Bavaria to 1. acuti- 

 rostris, and a drawing by him in the Museum copy of 

 that work of a skull from Banz shows the separation of 

 the premaxilla and lachrymal beneath the nares charac- 

 teristic of this and the next species. In the absence of 

 the exact contour of the rostrum and the form of the 

 supratemporal fossa, it is, however, impossible to deter- 

 mine to which of the two species these specimens belong. 

 The strong ridge on the anterior border of the scapula is 

 very apparent. Purchased, 1857. 



R. 972. Slab showing the right lateral aspect of- a smaller and 

 nearly entire skeleton ; from the Upper Lias of Holzmaden. 

 The skull is crushed, the limbs have been somewhat dis- 

 located, and the posterior caudal vertebrae are thrown out 

 of place. . Same history. 



39489. Slab showing the ventral and part of the left lateral aspect 

 of the crushed skull of a much larger individual, probably 

 referable to this or the next species ; from the Upper 

 Lias of "Wiirtemberg. So far as can be seen, this specimen 

 agrees very closely with the sketch of a cranium by Theo- 

 dori mentioned above. Purchased, 1864. 



R. 1198. Slab showing the right lateral aspect of an imperfect skull 

 of medium size, probably belonging to this species ; from 

 the Upper Lias of Boll, Wiirtemberg. The anterior cervical 

 vertebras still remain in position. The outline of the skull 

 seems to accord closely with the above-mentioned drawing 

 by Theodori ; and, so far as can be determined, the maxilla 

 seems to enter the lower border of the nares. No history. 



Ichthyosaurus zetlandicus, Seeley \ 



Syn. Ichthyosaurus longifrons, Owen 2 . 



Cranial rostrum straight and of moderate length and thickness 

 (fig. 28) ; supratemporal fossae (figs. 28, 29) long, large, and ap- 

 proaching the form of an isosceles triangle ; fronto-nasal region long 

 and narrow, with the median part of the nasals depressed and their 



1 Quart. "Journ. Geol. Soc. vol. xxxvi. p , 635 (1880). 



2 Liassic Reptilia (Mon. Pal. Soc), pt. iii. p. 118 (1881). 



