JURASSIC AND TRIASSIC BRACHIOPODA. 165 



Portlock in 1843, and in later years more frequently with T. punctata." The specimen of 

 the so-termed T. ornithocephala, ' Min. Con./ Tab. 101, fig. 4, from the Blue Lias Marl of 

 Pickeridge, evidently belongs to W. perforata of Piette ; and I prefer to refer it to that 

 species, as D'Orbigny's Ter. Sarthacensis is involved in some confusion, and none exists 

 with respect to Piette's species. It is very questionable whether the true W. Sarthacensis 

 of D'Orbigny has been found in our Liassic strata. W. perforata is remarkable for its 

 sub-pentagonal shape and small umbo ; and, as stated by Mr. R. Tate, it is nearly allied 

 to W. indentata, although specifically separable. Dr. Wright quotes it under the name of 

 T. psilonoti (Quenstedt) in his paper " On the Zone of Avicula Contorta, and the Lower 

 Lias of the South of England " (' Quart. Journ. Geol. Soc.,' vol. xvi, p. 403, 1860), and 

 from the zone of Am. BucMandi. Professor R. Tate mentions its occurrence in the zone 

 of Am. angulatus (a portion of the Hettangian Series of French Liassic Geologists) 

 at Market Weighton and Redcar. It was also found in a similar position by the Rev. 

 F. Smithe, near Churchdown, in Gloucestershire. Much credit is due to the Rev. P. 

 Smithe for having been able to isolate this zone, which had been often classed by British 

 geologists with either the Am. planorbis or A. Bucklandi zone. The Am. angulatus zone, 

 near Churchdown, has afforded the Rev. P. Smithe between seventy and eighty species. 

 W. perforata has also been found in the Middle Lias (zone of Am. Jamesoni), at Hunt- 

 cliff, Coatham, Normandy, Upsall, and Easby, and in the A. spinatus zone at Grosmont, 

 Yorkshire (Tate). The same author quotes it from the Am. armatus zone of Robinshood 

 Bay (Yorkshire). It has been found likewise near Radstock, near Bristol, Bath, Stone- 

 house, Charmouth, and in many other places. It occurs in the Am. BucMandi beds at 

 Hallaig, in the Island of Raasay, Scotland (Tate) ; and it is very abundant in the same 

 horizon in France, also in Wurtemberg. 



Waldheimia ornithocephala, W. lagenalis, W. Cadmonensis, W. lampas. 



In August, 1815, James Sowerby published his description of Terebratula ornitho- 

 cep/tala in the following words : " Ovato-rhomboidal ; depressed when young ; elongated 

 and gibbous when old ; front straight, bounded by two obtuse lateral depressions similar 

 in each valve. The aperture in the elongated beak is large. Breadth of shell equal to 

 four fifths of its length ; the sides, being rather depressed, produce an obtuse angular 

 projection on the front. I have specimens from the Cornbrash Limestones at Chatley 

 from Thomas Meade, Esq., and others picked out of the Blue Lias (Marl) at Pickeridge, 

 by favour of Miss Hill. The left-hand figure is from a Cornbrash Limestone specimen, 

 and figure 4 is a young depressed shell from Pickeridge." 



