ME J. W. GEEGOEY ON THE MALTESE FOSSIL ECHINOIDEA. 



603 



Length, 









30 mm 



Width, 









26 „ 



Height, 









13 „ 



Height of posterior margin, . 







4 ., 



Anterior ambulacrum, 



length, 







8 „ 



>> ?» 



width, 







3 „ 



Anterior ambulacrum, 



number 



of 



pores, 





ant. zone, 









20 



Anterior ambulacrum, 



number 



of 



pores, 





post, zone, 









32 



than the inner series ; pores conjugate. The antero-lateral petals shorter than the 

 postero-laterals. 



Mouth subcentral ; floscelle rather indistinct. 



Anus small, oval on the low posterior margin. 



Dimensions — 



Posterior ambulacrum, number of pores, 



ant. zone, , . . 35. 



Posterior ambulacrum, number of pores, 



post, zone, . . . 27 



Posterior ambulacrum, length, . 10'5 mm. 



„ „ width, . 3 „ 



Mouth, distance from anterior margin, 13 ,, 



Apical system, distance from anterior 



margin, . ' . . 11 ,, 



Type.— Brit. Mus., E. 3404. 



Distribution. — Pembroke Camp, Malta — Lower Coralline Limestone. 



Remarks. — This species differs from Breynella vasalli (Wright) in that the apical 

 system is more anterior, the petals shorter, and the highest point is further from the 

 posterior margin. A perhaps more important point is the great inequality in the length 

 of the poriferous zones in the paired ambulacra. In fact, this may be of generic value. 

 Professor F. Jeffrey Bell has established the genus Palceolampas * for those species of 

 Echinolampas in which the poriferous zones on each side of an ambulacrum are equal in 

 length. Tf this genus be accepted, as has been done, though with a different interpreta- 

 tion, by M. Pomel t and by Professor Duncan,| then Breynella must be subdivided on 

 the same lines. Breynella will be the equivalent of Palceolampas, and a new division 

 made to correspond with Echinolampas. M. de Loriol, however, has advanced some 

 weighty objections to the adoption of Palceolampas, and as I agree with him, I leave 

 those who believe in the value of this character to apply it to the subdivision of 

 .Breynella, Catopygus and other allied forms. 



Synonymy- 



Genus Studeria, Duncan, 1889 (as subgenus). 



Species Studeria spratti (Wright), 1864, n.d. 

 Var. elongata, n. var. 



Pygorhynchus spratti, Wright, 1864 (name and figure only), "Foss. Echinidse Malta," Quart. Journ. 

 Geol. Soc, xx., pi. xxi. f. 6. 



* "On Palceolampas, anew genus of the Echinoidea," Proc. Zool. Soc, 1880, pp. 43-49, pi. iv. 



t Classif. meth. et Gen. des Itchinides, p. 62. 



% Revision, Journ. Linn. Soc. Zool, xxiii. (1889), p. 194. 



