422 DE. J. W. GEEaORT ON THE 



Pomel * has founded a species, G. suhoblongus, on some spe- 

 cimens from Corsica and Algeria, wliicli are closely allied to 

 G. Guentlieri, but they appear to me to be closer to G. gilhosus. 

 G. suhohlongus, at any rate, differs from G. Guentheri by having a 

 longer and more gradual posterior slope, without the separation 

 into the steep upper part and thin basal foot. In G. Guentheri, 

 moreover, the petals are proportionately longer, and the inter- 

 poriferous granules less numerous, and there are fevrer plates in 

 the petaloid portions of the ambulacra (about 40 instead of 

 about 60). 



Abich. included G. alius in bis synonyms of G. turritiis ; but in 

 bis explanation of plates he quoted the specimen as G. alius, 

 Lam., var. turritus, Philippi. That be vras right in identifying 

 G. turritus with G. alius I have urged previously f. Later on, 

 Abich figured another specimen of G. alius ; the specimen can- 

 not be determined satisfactorily from the figure, but the ecbinid 

 is certainly not a Glypeaster, and is probably a Gonoclypeus. 



3. Cltpeaster Martini, DesmouUns J. 



Abicb, in 1882, figured an echinid from the Lower Miocene of 

 Mamachatun which he referred to this species ; the specimen is 

 imperfect, and the ambulacra are so badly shown that the iden- 

 tification might have been questioned. But Mr. Giinther's 

 collection includes three specimens wbicb must, I think, be 

 referred to G. Martini, and thus support Abich's identification. 

 Mr. Loftus's collection in the British Museum includes another 

 specimen (E. 2446) which may be included in the same species, 

 though the petals are more tumid than in the other specimens. 



The five specimens in question are by no means identical in 

 form. One of Mr. Griinther's specimens is too fragmentary to 

 be of service ; but the dimensions of the other four specimens 

 and of Michelin's figured specimen of G. Martini are given on 

 the opposite page. The dimensions for G. melitensis, Mich., and 

 C. MicJieloiii, Ag. {fide Michelin) are also added. 



* A. Pomel, ' Pal^ontologie de I'Algerie : Zooph., Fasc. 2. Ecliinodermes,' 

 Livr. 2, 1887, pp. 192-3, pi. B xxiii. figs. 1-6. 



t J. W. G-regory, " The Maltese Fossil Echinoidea," Trans. E. See. Edinb. 

 vol. xxxvi. pt. 3, 1891, p. 594. 



\ C. Desmoulins, " Etudes sur les Echinides," Mem. 3, Acfces Soc. Linn. 

 Bordeaux, vol, ix. 1837, p. 64 ; Michelin, op. cii. p. 1.34, pi. xxxv. fig. 1. 



