Prof. Morris —Boring Mollusca in Oolites. 269 



profusely by several species of Lithodomi." The cavities formed in 

 the coral by the Lithodomi, and frequently their unoccupied shells, 

 contained one, two, or even as many as three double valves of Modiola 

 enveloping one another. 1 



Mr. Hull 2 mentions that, near Burford, the upper rock bed (Great 

 Oolite) is frequently pierced by Lithodomi, and affords evidence of 

 having been consolidated contemporaneously with its deposition. 

 Occasionally we find beds of conglomerate, formed by waterworn 

 fragments of the underlying limestone, loosely heaped together, as if 

 they had been broken up by a storm, dashed about, and then retained 

 in their places by the rapid formation of new calcareous matter. 

 Again, on the west side of the valley of the Churn, the upper white 

 limestone is pierced by Lithodomi, and contains sandy druses in 

 which Echini and other fossils frequently lie concealed ; it forms a 

 marked geological horizon, the only one which offers a line of de- 

 marcation between the Great Oolite and Forest Marble. 



Mr. Lycett thus describes 3 the section of the quarry at Minchin- 

 hampton Common, in descending order : — Planking, a shelly coarse 

 oolite limestone, 10 feet; soft, thin-bedded, rubbly calcareous oolite, 

 10 feet ; oven-stone, soft yellowish oolite, shelly, the testacea being 

 arranged in layers which assume every kind of inclination ; numerous 

 holes, bored by Lithodomi, pervade it, 6 feet ; weather-stone, grey- 

 ish brown oolitic shelly limestone ; basement bed, a brown and 

 blue band, 6 feet ; argillaceous limestone, full of oysters, 4 inches. 

 Mr. Lycett 4 also observes that "it is a common occurrence to find 

 isolated pebbles of hard calcareous freestone in the shelly beds of 

 the formation ; but at the Hyde, one mile from Minchinhampton, a 

 small road- side section discloses conglomerate of the Great Oolite ; 

 the rolled calcareous hard pebbles having a matrix of fine-grained 

 limestone." 



M. Eugene Deslongchamps 5 describes a section at Lion-sur-Mer 

 (Calvados) as follows : — 



Oxford Clay, four metres. 



Great Oolite, with many Gasteropods and Lamellibranchs (Lang- 

 rune beds), upper surface hard and perforated (chien superieur), 6 

 15 metres. 



Marly limestone, full of Polyzoa, with Ter. digona, T. cardium 

 (Caillasse of Eanville), six metres. 



Eanville building stone, a little oolitic, surface hard and perforated 

 (chien inferieur), 15 metres. 



Caen limestone, representing the Fullers-earth, surface hard and 

 perforated, 20 metres. 



1 Mag. Nat. Hist. 1839, p. 551. 



2 Hull, Geology of Country around Cheltenham, pp. 64, 65 ; Mem. Geol. 

 Survey, 1857. 



3 Lycett, The Cotteswold Hills, 1857, p. 93. 



4 Lycett, ibid. p. 99. 



5 E. Deslongchamps, Notes pour servir a. la Geologie du Calvados, Caen, 1863. 

 Bull, de la Soc. Linn, de Normandie, vol. vii. 



6 The workmen of Eanville give the name of chien to these hard and perforated 

 surfaces, in allusion to the hardness of these bands. Bur comme du chien is a Nor- 

 mandy expression which indicates an extreme degree of compactness. 



