MR J. W. GREGORY ON THE MALTESE FOSSIL ECHINOIDEA. 



621 



Fascioles : The peripetalous is very sinuous ; in the antero-lateral interradii it makes 

 either one or two sharp inward bends. The subanal is distinct. 

 Mouth close to the anterior margin ; strongly bilabiate. 

 Dimensions (average of five specimens) — 



Posterolateral ambulacra: length, . 19 mm. 



Distance of apical system from anterior 



margin, . . 27 „ 



Type.—'&nt. Mus., E. 3428. 



Distribution. — Malta — Upper Coralline Limestone. 



Remarks. — This species differs from B. oblongus, Wr., the only form on the island 

 with which it could be confused, by the less excentric position of the apical system and 

 by the much greater width. In the former character it tends to approach Brissopsis. 



Length, .... 



66 mm. 



Width, .... 



56 „ 



Antero-lateral ambulacra : length, . 



24 „ 



Genus Metalia, Gray, 1855. 



Species l. Metalia melitensis, n. sp, 



Plate II. fig. 5 «- c - 



Diagnosis. — Test of moderate size, thin, depressed ; the posterior margin is continued 

 back as a projection overhanging the anus. Actinal surface flat, except for a prominence 

 on the posterior end of the amphisternum. The outline is well rounded, except that the 

 anterior border is flattened and very slightly indented. The highest part of the test is 

 half-way between the apical system and the posterior margin. 



Apical System excentric in front. 



Ambulacra : Anterior in a very shallow groove ; pores small and few. Antero-lateral 

 strongly divergent ; pores large and close. Petals closed ; interporiferous areas of medium 

 width. Postero-lateral pair much the longer ; pores smaller and closer. Interporiferous 

 areas proportionally narrower. Petals almost flush with the test. Of the six pairs of 

 pores on each side of the area within the subanal fasciole, only four pairs are well marked. 



Anus transverse. 



Mouth rather far from the front margin ; semilunar. 



Dimensions — 



Length, . . . .49 mm. 



Height, . . . . 19 „ 



Width, . . . . 45 „ 



Apical system : distance from anterior 



margin, . . . . 18 „ 



Mouth: distance from anterior margin, 12 „ 



Antero-lateral ambulacra 



length, 



15 mm 



)> j> 



width, 



. 5 ,. 



Postero-lateral „ 



length, 



17 „ 



>) » 



width, 



6 „ 



Inter-subanal plastron : 



width, 



. 8 „ 



)> » 



height 



• 14 „ 



Type.— Coll. Mus. Pract. Geol. 



Distribution. — Malta — Globigerina Limestone. 



Remarks. — Of the species with which this has been compared it agrees most with 



