POTERIOCRINIDyE PENTACRINUK. 125 



8. Species. Pentacrinus Fittonii. (Austin.) 

 PL \&,Jig. 5. a, and 5 h. 



The remarks in preeerling pages on Ibe questional)le propriety of founding species on 

 detached iVagnients of ciinoids are equally applicable to this, but at the same time we 

 have no doubt the fragments discoveied by Dr. F'itton in the Gault ol Kent and Wilt- 

 shire are portions of a Pentacrinus, difiering in many respects from established species, 

 therefore we have no liesitalion in dedicating it to its discoverer, and placing it among 

 its congeners. 



The column of this Pentacrinus is more acutely angular than the preceding species, 

 and is altogether less massive. The articulating floiiform ridges are also different. 

 They are not so strongly marked, nor are tlie depressions on the face of the joints, for 

 the attachment of the muscular integument so deeply impressed. 



Synonymes and References. 



—Dr. Fitton, Geol. Trans, vol. 4, Fl. \\,fig. 4, 

 p. 114, 130, and 2^9. 



Formation and Localities. 



The Gault at Copt Point, near Folkstone ; and in the Vale of Wardour, Wiltshire. It 

 is also said to occur in the Lower Green Sand, in the vicinity of Folkstone, Kent. 



In Dr. Fitton's paper on the strata below the Chalk, we find the following observations 

 respecting this J'entacrinus. 



"The stem only has been found, it is various in size, the sides are concave, the angles 

 rounded. Joints equal, the margins of their surfaces ornamented with short stri<E. 



Some specimens show the bases of lateral arms. It strongly resembles a species 

 found in the Chalk ; (Mantell's Fossils of the South Downs, p. 183; Geol. of the South 

 of England, p. 112); which is however much larger." Geol. Trans, vol. 4, p. 335. 



The Pentacrinus found in the Chalk is without doubt a distinct species, but as no 

 specimens have been discovered sufficiently perfect to furnish distinct specific characters 

 on, we at present abstain from attempting a more detailed description of it. 



In the stratigraphical table at page 352, vol. 4, of the Geol. Transactions, the 

 Pentacrinus Fitonii, is referred w ith a double note of interrogation to the P. scalaris, — 

 the Millerii of our monograph, from which it specifically differs. 



