288 Chronicles of Science. [April, 



E.E., is another work wliicli cannot fail to be acceiitable at tlie 

 present time, containing as it does an account of their rise, progress, 

 and construction. It has been compiled Irom the records of the 

 India Office, and is stamped -with additional authority from the fact 

 of its author having formerly been Deputy Consulting Engineer 

 for Eailways to the Government of Bengal. 



7. GEOLOGY AND PALEONTOLOGY. 



(Including the Proceedings of tJie Geological Society, and Notices 

 of Recent Geological Worhs.) 



The Palaeontographical Society have just issued their twenty-second 

 annual volume, and, as usual, it is a bulky one ; but, though large, 

 it is good. It consists of a series of six parts, all continuations of 

 Monographs now in progress. 



(A.) In the first Dr. P. Martin Duncan introduces us to the 

 corals from the White Chalk, the Upper Green-sand, and the Pied 

 Chalk of Hunstanton. 



Twenty-eight species are illustrated in the nine plates which 

 accompany this part, and many more are enumerated which Edwards 

 and Haime figured and described in the Pala?ontographical volume 

 (VIII.) for 1853. Such forms as Trocliosmilia, presenting nume- 

 rous minor difierences of doubtful specific value, have been entered 

 as varieties under a common species. This trinomial nomenclature 

 proves exceedingly convenient where the amoimt of character to be 

 expressed is trivial. 



(B.) Mr. Henry Woodward contributes a second part to his 

 Monograph of the fossil Merostomata, belonging to the genus 

 Pterijr/otus. The specimens figured are all from the Upper Silu- 

 rian of Lanarkshire, where they are collected by a Mr. Slimon, who 

 ingeniously turns aside the stream of Logan AVater in the summer 

 season, and then excavates the beds which lie beneath. The fossils 

 are preserved (often in a wonderfully perfect state, considering their 

 extreme tenuity) upon the surface of olive-green and grey slates, 

 frequently with all then- appendages attached. 



Mr. Woodward has pursued the same course as Dr. Duncan, 

 and we find in this part figures and descriptions of four varieties of 

 Pteryijotus hilohus. Six plates are occupied with their illustration. 

 These queer creatures, with their chelate antenna^, large heart- 

 shaped lip-plates, great starhig compound eyes, and long fish-like 

 bodies, remind one strongly of larva; of some aquatic insect. The 

 largest of aU the Pterygoti is six feet in length ! 



(C.) Again we welcome Mr. Davidson, with his splendid suite of 



