REPORT ON THE ECHINOIDEA. 199 



Station 75. July 2, 1873. Lat. 38° 37' N., long. 28° 30' W. ; 450 fathoms ; sand. 

 Off Fayal. 



Station 122. September 10, 1873. Lat. 9° 5' S. to 9° 10' S., long. 34° 49' W. to 

 34° 53' W. ; 350 fathoms ; mud. 



Metalia (Brissus). 



Plaijionotus, Agassiz, 1847 («o« j\Iuls., 18i2). 

 Metalia, Gray, 18.55, Cat. Rec. Ech. 



Metalia maculosa. 



Echinus maculosus, GmeL, 1788, Linn. Syst. Nat. 



Metalia maculosa, A. Agassiz, 1872, Eevis. Ech., part 1, p. 114. 



Stationl88. Sept. 10, 1874. Lat. 9° 59' S., long. 139° 42' E.; 28 fathoms; mud. 

 Metalia pectoralis. 



Echinus grandis, GmeL, 1788, Liun. Syst. Nat. 



Metalia pectoral is, A. Agassiz, 1872, Revis. Ecli., part 1, p. 144. 



Fragments of the abactinal surface of the test of a specimen of this species were 

 collected off Bahia, which show that the large tubercles within the peripetalous fasciole 

 carry large long curved spines like those of Breynia, Lovenia, Maretia, Eupatagus and 

 the like. The spines near the posterior extremity and close to the ambitus, as well as on 

 the actinal side, are stouter and longer than the uniform coating of spines covering the 

 greater part of the abactinal surface of the test outside of the peripetalous fasciole. The 

 size of the tubercles indicates well in a general way the proportion and character of the 

 spines. The colour of the spines in alcohol is a pinkish buff. 



Off Bahia. 



Schizaster. 

 Schizaster, Agassiz, 1836, Prod. 



It will evidently be extremely difficult when including the fossil species to separate 

 satisfactorily many of the fossil species of Lvnthia from Schizaster, the passage being very 

 gradual from species having the typical facies of Brissus with the lateral fasciole of 

 Agassizia and Schizaster, to species in which the sunken petals, more or less broad 

 and sunken anterior ambulacrum, and the general outline of the test approach the more 

 or less globular species of Schizaster. Yet among the recent forms the only two species 

 known seem to indicate very distinct generic differences. See more specially the descrip- 

 tion of a very typical and most interesting new species of Linthia, by Mr E. A. Smith 

 in Ann. and Mag. Nat. Hist, 1878, vol i. p. 67. 



From the species of Linthia, combining many of the characters of Schizaster, there is 



