lo2 Jones—Note on some Specimens from Malta. 



2. — From the Marl, a. Grey marl, probably Foraminiferal, but 

 not examined yet. h. Ferruginous nodules; that is, pyrites decom- 

 posed into concentric nodules of iron-oxide and ochre, with traces 

 of sulphur. 



3. — From the Calcareous Sandstone. (" Freestone " of Captain 

 Hutton's memoir), a. Shell-grit, or friable limestone, with No- 

 dosaria, Dentalina, Cristellaria, AmpJiistegina, Lituola Soldanii (large, 

 coarse-shelled, greenish-grey, abundant), Polyzoa, Shells (Pecten, 

 etc,), Echinoderms. h. Two small greenish-grey lobulated pebbles 

 (water- worn) of hard limestone; one compact (polished outside), 

 the other shelly. One of these pebbles has been drilled by boring 

 animals, and the hollows have been filled compactly with greenish 

 calcareous grit. c. Nodular masses, or rather, water-worn honey- 

 combed patches of hard ferruginous shell-limestone, full of Polyzoan 

 fragments. In some specimens this is adherent to a water-worn 

 surface of softer and whiter limestone, composed of similar materials. 

 Polyzoa, Shells, Echinoderms, Orbitoides, etc. I do not know whether 

 & or c (or both) belong to the bands of " nodules " mentioned in 

 Captain Hutton's memoir.^ d. Ferruginous nodules, like those from 

 No. 3. 



4. — From the Lower Limestone, a. Some specimens of Shell-grit, 

 some of compact Limestone ; with Polyzoa, Orbitoides Mantelli,^ 

 Heterostegina depressa, AmpJiistegina vulgaris, &c. b. A white 

 Orbitoidal Limestone, with pisolitic structure (looking somewhat 

 like an Alveolina-limestone at first sight), and with crystalline 

 carbonate of lime irregularly distributed in the interstices through- 

 out the mass. A hard limestone from St. Gl-eorge's Bay, given me 

 by Captain Hutton, also has this quasi -stalagmitic arrangement of 

 calcite among the constituent particles, c. Pieces of the tube of a 

 large Teredo, abundant in portions of the lowermost rock, especially 

 such as are broken up for lime-burning. Near Marsa Sirocco one 

 part of the Limestone is almost entirely composed of these tubes 

 (Adams). 



Lastly, found only in the breccias and gravels of Malta, a hard, 

 dark-grey, siliceous limestone, formed almost entirely of Amphis- 

 tegincB, and ossicles of Starfishes ; the latter are strikingly con- 

 spicuous as white subangular spots on a blackish ground.^ Treated 

 with acid, this rock exhibits a delicate siliceous skeleton. 



I have to add, that, after careful comparison of specimens, I find 

 no true Operculina in the Maltese Limestones and Shell-grits. The 

 Foraminifers that I alluded to as 0. complanata ("Geologist," vol. 

 vii. p. 134) are really Heterostegince of old and strong growth (see also 

 foot-note, GrEOLOGiOAL Magazine, vol. i. p. 104). The " Lenticulites 

 complanatus, Def.," alluded to by Dr. Adams in his remarks on the 

 so-called " Sand-bed " in the Quart. Journ. Geol. Soc, vol. xx. p. 

 472, is also the same Heterostegina depressa. 



1 See Plate VIII. Fig. 4, ted Ko. 3, a, a. 



2 See Geological Magazine, vol. i. p. 104. 



* This black limestone is without doubt the same as that alluded to above by 

 Captaia Hutton, when describing the " Elephant-bed." 



