Miscellaneous, 459 



Myomorphiis, Megdlonyx. 



Length of dentary ramus from the last 



molar to the anterior margin 115 mill. 150 mill. 



Space occupied by the three serial teeth 63 „ 60 „ 



Length of the bar 30 „ 40 „ 



Depth of the dentary ramus below the 



serial molars 70 „ 100 „ 



Interior separation of the two rami to- 

 wards the last molar 18 „ IB „ 



— Comptes Bendus, tome Ixvii. September 28, 1868, pp. 665-668. 



On Capillary Vascular Systems in the Gasteropoda. 

 By Professor C. Wedl. 



The theory proposed by Milne-Edwards, that in the Mollusca 

 the arterial and venous systems are not united by a capillary system, 

 but that a system of lacunae destitute of proper walls intervenes be- 

 tween them, is not confirmed in the Gasteropoda investigated by the 

 author. In Helix, Limax, Turbo, Lymnceus, and Murex he has 

 ascertained the existence of closed capillary systems, with proper 

 walls and characteristic of the different organs ; these may be dis- 

 played by injection either from the arterial or the venous side. The 

 existence of a lacunar system must be denied even in the respira- 

 tory organs. Nor could he convince himself that the vascular sys- 

 tem is open either towards the cavity of the body or the outer sur- 

 face. Hence the theory of the imperfect circulation of the blood 

 in the Gasteropoda is at least not of universal application. — An- 

 zeige der Akad, der Wiss. in Wien, July 23, 1868, p. 179. 



On some new Fossil Fish from the Lias of Lyme Regis. 

 By Sir Philip de M. Grey Egerton, Bart., M.P., E.K.S., F.G.S. 



1. Osteorachis macrocephalus , gen. et spec. nov. — A Sauroid fish, 

 chiefly remarkable for the massive dimensions and complete ossifica- 

 tion of the bodies of the vertebrae, and characterized by the large 

 size of the head and the multiplicity of the teeth. 



2. Isocolum granulatum, gen. et spec. nov. — For elegance of form 

 this fish can vie with the salmon of modern times, its contour being 

 very similar. It bears the greatest resemblance to the Sauroid genus 

 Caturus, but in the absence of the teeth it cannot be assigned with 

 certainty to any particular family. 



3. Holophagus gulo, spec. nov. — A coelacanth fish, remarkable 

 for its resemblance, especially in the contour of the head, to the 

 Cretaceous genus Macropoma, and for substantiating Prof. Huxley's 

 demonstration of the persistence of type presented by this family, 

 which ranged from the Coal-measures to the Chalk. 



4. Eulepidotus sauroides, gen. et spec. nov. — This first represents 

 a genus uniting the Lepidoid and Sauroid families of Agassiz's 

 Ganoid order ; the teeth and the tail being Sauroid in character, 

 while the fins are Lepidoid, and the scales partake of the characters 

 of those structures in both families. — Proc. Geol. Soc. June 17, 1868. 



