348 Correspondence. 



LITHODOMOUS PERFORATIONS. 



Sir, — The subject of " Lithodomous perforations" in limestone 

 rocks above the present level of the sea, has for some time occupied 

 so large a space in the Geological Magazine as to furnish me with 

 an excuse for troubling you witb the following passage from the 

 "Natural History of South Devon," by J. C. Bellamy, Surgeon, 

 1839, pp. 114-5: — "The usual height of the ancient beach in 

 Plymouth Hoe (now nearly destroyed) is about 30 feet above 

 present high- water mark. The rock on which it rests is often 

 smoothened, and specimens of Pholas dactylus are found in it ; and 

 the roundness of the pebbles, and the existence of these shells in the 

 smoothened rock, sufficiently show that the sea rested there awhile." 

 I will only add that Mr. Bellamy resided in the neighbourhood, and 

 was one of the curators of the Devon and Cornwall Natural History 

 Society. — I am, etc., 



ToRauAY, June 13, 1870. Wm. Pbngelly. 



FOSSIL INSECTS. 



Sib, — In the March number of the Geol. Mag. (p. 141), a cor- 

 respondent refers to the Tertiary Insect-remains of Dorset. I am 

 thereby reminded that Mr. W. E. Brodie informed me some years 

 since that two of the fossil insects described in Mr. Westwood's 

 elaborate memoir in the Quart. Jour. Geol. Soc. vol. x., pages 378-96, 

 were, by inadvertence, wrongly located, namely, — Plate XIV. Fig. 4, 

 Doubtful elytron, is Tertiary, from Creech near Wareham, Dorset, 

 (not from the Lower Purbeck). Plate XIV. Fig. 8, Wing of Giant 

 Ant (not from the Lower Purbeck). 



Royal Military College, Sandhurst, T. Eupert Jones. 



IQth June, 1870. 



IVniS CIS XjL.A.35r:E] OTJS . 



Diamonds in Bohemia. — Dr. A. Fritsch informs us that a Diamond 

 has been found in Bohemia. The locality is on the southern part of 

 the basaltic mountains, on the fields near Dlaschkovic, between Pod- 

 sedic and Chrastan, on the road from Zobosic to Laun. Before its 

 examination this very hard stone was believed to be a Zircon, but the 

 careful investigation of M. Schafarik, Professor of Chemistry, at 

 Prague, has shown it to be a genuine diamond. The weight is 57 

 millimetres, colour yellowish, largeness 4 millimetres long, 21 milli- 

 metres broad, density 3-53. Indications of octahedral planes are to 

 be seen. A fragment was burnt in oxygen, and entirely disap- 

 peared ; this experiment was performed in the presence of numerous 

 reliable witnesses. The specimen has been presented by Count 

 Ervine Schmbom to the Museum of Prague. 



We have received specimen-plates of a new work, now in prepar- 

 ation by M. M. Fritsch and Schloenbach, " On the Cephalopoda of 

 the Chalk-formation of Bohemia," to contain about 14 quarto plates 



It is much to be regretted that we cannot obtain Artists or Litho- 

 graphic Printers able to compete, either in price or qualityof work> 

 with those of France, Germany, or Austria. 



