328 Mr. Weaver's Geological Observations on 



Of chambered univalves we meet with orthoceratites, the Conularia of 

 Mr. Miller, and one species of ammonite. Of the last, however, there has 

 occurred only one incomplete specimen, which was found by Dr. Cooke in a 

 detached state near Falfield quarry. Orthoceratites are not uncommon, 

 affording three or four, if not five, species, smooth and annular, obtuse and 

 conical or pyramidal, with the chambers generally disposed at right angles 

 to the siphuncle ; but in one species they form an oblique angle. The ortho- 

 ceratites are in general ill displayed ; among them, however, may be observed " 

 Orthocera circularis (Sowerby, PI. LX. fig. 6 and 7.) and Orthocera annulata 

 (Ibid. PI. CXXXIII.). I found only one small specimen of Conularia quadri- 

 sulcata, (Ibid. PI. CCLX. fig. 3 and 4.) ; in Whitefield quarry. 



Of univalves not chambered, there occur occasionally euomphalites (namely, 

 Euomphalus discors, E. angulosus (Sowerby, PI. LII. fig. 1 and 3.) * ; neri- 

 tites, helicites, melanites, turbinites, and dentalites ; patellites, if such they be, 

 very rarely. Of these last I can record only a few specimens, one of which, 

 found in Whitefield quarry, has some resemblance to the Patellites primi- 

 genus of the Baron Von Schlotheim, which occurs in the transition limestone 

 of the Duchy of Berg {Nachtrage zur Petrefactenkunde, PI. XII. fig. 1. b.) ; 

 but as my specimen is merely an impression, it may possibly be only a cast 

 representing in relief the concave surface of one of the vertebrae of a fish ; 

 the fish bones above noticed also occurring in the same bed. A second speci- 

 men found at Pyrton, and two others at Long's quarry, are widely different ; 

 none of these, however, are sufficiently distinct to enable me to speak with 

 decision on the subject f . 



The dentalites appear to be of two species ; one annulated, the other resem- 

 bling in form the tubes of a telescope drawn out at short distances ; but both 

 terminate conically. They are similar to those organic remains found in the 

 transition rocks of the Continent, which have been described by some writers 

 as Tubulites geniculatus and as orthoceratites, and latterly, by Baron Von 

 Schlotheim, as Tentaculites annulatus, and T. scalaris {Petrefactenkunde 

 PI. XXIX. fig. 8. a. b. and fig. 9. b.). But Mr. Miller informs me that on 

 rubbing down two diluvial boulders of transition limestone, containing similar 

 remains, met with near Dantzig, he found them destitute of chambers, and 

 consisting merely of hollow slender cones, externally annulated. Yet, if the 



* The Euomphalus rugosus also, depicted in fig. 2. of the same plate, is found in the transition 

 tract of the north-west of the county, particularly at Longhope. 



t It appears, however, that patellites occur in the transition tract of Wales, having been 

 noticed by Dr. Gilby junr. in his valuable account of a part of that tract, extending from Bre- 

 conshire into Radnorshire. (Edinb. Philos. Journal, Vol. II.) 



