1857.] WRIGHT LIAS FOSSILS FROM SKYE. 33 



Middle Lias near Cheltenham ; with G. crassa, Buckm., from the 

 Lower Lias, it has no affinities whatever. 



I dedicate this fine species to the memory of Dr. Macculloch, to 

 whom we are indebted for much valuable information on the geology 

 of the Western Islands of Scotland. I am the more desirous of con- 

 necting that eminent geologist's name with the Pabba-beds, seeing 

 that the Gryphcea dedicated to him proves to be a previously- 

 described species. 



Gryphcea cymbium, Lamarck, 1816. 



Gryphcea cymbium, Lamarck, Animaux sans Vertebres, vol. vi. 

 p. 198 ; Goldfuss, Petrefacta Germanise, t. 84. f . 5 ; t. 85. 



Gryphcea Maccullochii, Sowerby, Mineral Conchology, t. 547. 

 f. 1, 2, 3. 



This species has long been misunderstood by English palaeontolo- 

 gists, as it is not an abundant shell in England ; I have collected it, 

 with Ammonites Henleyi, Sow., at Charlton near Cheltenham, and 

 I have received specimens from near South Petherton. The shells 

 collected by Mr. Geikie from the Pabba-shales enable me to clear 

 up a doubt which has long existed relative to Gryphcea Maccullochii, 

 Sow., being a variety of Gryphcea obliquata, Sow. ; for these speci- 

 mens, collected, like the types of Sowerby' s species, from the Lias 

 at Pabba, enable me to state that Gryphcea Maccullochii, Sow., from 

 Pabba is the true Gryphcea cymbium, Lamk. 



One of the Pabba specimens represents Goldfuss' var. y, dilatata ; 

 it is 3| inches in height by 3 inches in breadth ; other examples 

 nearly agree with Sowerby's figures 2 and 3. t. 547. In Gloucester- 

 shire this Gryphcea is found in general in the Middle Lias Clay ; but 

 in Yorkshire it occurs in the Marlstone. 



In France it attains a very large size, and is collected in several 

 Departments from the upper region of the Middle Lias with Ammo- 

 nites margaritatus, Montfort. 



Gryphcea obliquata, Sowerby, 1818. 



Gryphcea obliquata, Sowerby, Mineral Conchology, t. 112. f. 3. 

 obliqua, Goldfuss, Petrefacta Germanise, t. 85. f. 2. 



Although this shell is sometimes mistaken for Gryphcea arcuata, 

 Lamk., aud sometimes for Gryphcea Maccullochii, Sow., it is never- 

 theless distinct from both. In Gloucestershire it is found in the 

 Obtusus-bed of the Lower Lias, and ranges upwards to the base of 

 the Middle Lias. It has a similar distribution at Lyme Regis, Dor- 

 setshire, and at Robin Hood's Bay, Yorkshire ; and is found in the 

 lower beds at Pabba. 



In Gloucestershire Gryphcea arcuata, Lamk., is found in the 

 lower beds of the Lower Lias ; Gryphcea obliquata, Sow., in the 

 upper beds of the Lower Lias ; Gryphcea cymbium, Lamk., in the 

 Middle Lias ; and Gryphcea gigantea, Sow., in the Marlstone. 



VOL. XIV. PART I. D 



