MR J. W. GREGORY ON THE MALTESE FOSSIL ECHINOLDEA. 609 



Remarks. — This species is somewhat doubtfully retained in the Maltese fauna on the 

 strength of an imperfect specimen collected by Mr Cooke. It was recorded from Malta 

 by Dr Wright, and M. Cotteau has accepted the figure given in the Annals as correctly 

 identified. Nevertheless, I feel bound to cast Dr Wright's specimen out of this species 

 owing to the great difference in shape and in the length of the petals. In M. Cotteau's 

 admirable figure the petaloid portions of the ambulacra are seen to reach nearly to the 

 ambitus when the specimen is examined from above, whereas in Dr Wright's figure of 

 the upper surface of his specimen, the petals close at some distance from the margin. 

 Moreover, Desor in his diagnosis (Synopsis, p. 308), says that the species is " renflee, 

 subconique ; " Dr Wright describes his specimen as " depressed at the dorsal surface," 

 and "dorsal surface not so elevated as in E. scutiformis." One has only to look at the 

 following measurements and compare them with those of E. scutiformis (notice especially 

 the specimen described by M. Cotteau) to see that Dr Wright's specimen is of a different 

 species. As I have failed to identify it with any described form, a new species must be 

 founded to receive it. 



Dim ensions — 



Length, Breadth, Height, 



mm. mm. mm. 



Specimen from Corsica (M. Cotteau), . . .53 49 30 



Malta (Cooke's Coll.), . . .35 30 19 



„ „ (E. clesliayesi, Wr.), . . .21 19 8 



Species 5. Echinolampas posterolatus, n. sp. 



Echinolanvpas scutiformis, T. Wright, 1864 (non Leske), "Foss. Echinidae Malta," Quart. Journ. Geol. 

 Soc, xx. pp. 481, 482, pi. xxi. f. 4. 



Diagnosis. — Form elliptical, well rounded ; widest at the posterior part of the 

 postero-lateral interradii ; highest point coincident with the apical system. The anterior 

 slope is short and curved, the posterior is long and gradual. 



Apical system excentric anteriorly ; four genital pores. 



Ambulacra: Petals long, extending more than two-thirds of the distance to the 

 ambitus. In the anterior the interporiferous area is narrow and the left pori- 

 ferous zone the shorter. In the antero-lateral petals the interporiferous area is wide, 

 owing to the curve of the posterior poriferous zone ; the anterior zone is straighter and 

 shorter. In the postero-lateral pair the anterior poriferous zone is the longer and more 

 curved. 



Interradii: The postero-lateral pair occupy an exceptionally large amount of lateral 

 margin. The posterior interradius is depressed. 



Mouth in a deep depression, before the centre. 



Anus transversely oval, almost marginal. 



VOL. XXXVI. PART III. (NO. 22). 4 Z 



