124 Reviews — W/iiiaker's Memoir on apart of t fie London Basin. 



11. G. multiserialis, Giimb. — Mendola Dolornite. 



12. G. aqualis, Giimb. — Wetterstein Limestone, &c. 



13. G. curvata, Giimb. — Alpine Dolomite, &c. 



14. G. vesiculifera, Giimb. — Alpine Dolomite, &c. 



Two small problematical organisms, probably allied to Gyroporella, 

 are also figured and treated of, namely :- — 



Ci/lindrella Silesiaca, Giimb, from the MuscTielkalk ; and Uteria encrinella, 

 Michelin, from the Lower Tertiary beds of Guisse la Motte, France. 



The difficulty of working out the characters of these Gyroporellce 

 imbedded in hard limestones has been very great. Dr. Giimbel 

 himself looks forward to still more complete results being obtained 

 from continued research. Evidently, these organisms are to be 

 looked for in other Jurassic and Cretaceous strata, besides the Neo- 

 comian Limestone of the Wetterstein : the Verticellipora anastomo- 

 sans, and its varieties, in the Farringdon Beds, would repay the 

 labour of careful examination by a Dactyloporist. The great dif- 

 ference between the Triassic forms [GyroporelliB) , without true 

 " chambers," and the Tertiary Haploporellie and Dactyloporellie (with 

 true " chambers " ) is very striking. But certain Tertiary forms 

 (Thyr sopor ell ce) approximate to the Gyroporellce ; and if the last be 

 simple in some respects as to structui'e, nothing can be simpler in 

 make than several of the latest Haploporellce, mere rings or half-rings 

 of adherent sacs. 



That these little creatures have mightily aided in the construction 

 of all limestones is of great interest to the Geologist ; as lowly 

 links of life they are worthy subjects of study for the Zoologist. 



T. E. J. 



III. — The Geology of the London Basin. 



Memoirs of the Geological Survey op England and Wales, 

 Vol. IV., Part I. — The Chalk and Eocene Beds of the 

 Southern and Western Tracts of the London Basin. By 

 W. Whitaker, B.A., etc. 8vo. London, 1872. 



MANY a good deed passes unnoticed, and many a good work gets 

 little praise. They are none the worse for that ; and yet when 

 heard of thej become ensamples to many and good food for 

 the healthy inquiring mind. Thus one of the most important 

 geological publications of the past year was nnostentatiously pro- 

 duced by Her Majesty's Stationery Office ; and, not being announced 

 in circulars and advertisements, it makes no noise, though a standard 

 work and without a rival on its own ground. True it is, that prac- 

 tical geologists have had access to the maps to which it relates, and 

 to their divisional Explanations appearing from time to time, and 

 ultimately incorporated with the larger work,— and, more still, to 

 the author-in -chief of this comiDrehensive book, and his colleagues, 

 Messrs. Bristow and Hughes, — and thus, having benefited by fore- 

 taste and anticipation in the imparted knowledge, we forget to be 

 grateful when all the store of hard-won information is at last put 

 before us in a systematic form. The amount of general and special 

 geological informatiori amassed in this thick and well-illustrated 



