1879.] MR. F. J. BELL ON THE ECHINOIDEA. 249 



tluhf S RTTT!:'^f'^ '^'^''■'"^^ P'-^^^"*^ 't«^l^' ^hich shows 



o / Initfaaf^^ ^''"^ ^' °°°f '" " "^^ «P^^i^«- Altliough similar 



to I. mit>ata in its general coloration and white-edged quills it is 



lore part of the cheeks are also chestnut. 



16. TURDUS FALLENS. 



Turdus pallens, Pall. ; Salvad. torn. cit. p. 256. 

 An adult specimen sent by Mr. Treacher. 



1 7. MONTICOLA SOLITARIUS. 



^^ontieola aoHtaria (P. L. S. Miill.), Walden, Tr. Z. S. ix. 



A specimen sent by Mr. Treacher. 



This is the second occurrence of the bird in Borneo the first 



(Ibis 18/7, p. 13) from Mr. Alfred Everett's Biutulu collection 

 Mr. Treacher s specimen is in full blue-and-red pluma-^e with the' 

 usual margins to the feathers found in the winter dreT.' 



3. Observations on the Characters of the Echinoidea -I On 

 the Species of the Genus Brissus, and on the allied forms 

 Meoma and Metalia. By F. Jeffrey Bell, B.A Mag- 

 dalen College, Oxford, Zoological Department, British 

 Museum. 



[Eeceiyed February 18, 1879.] 



In an examination of the specimens of Echinoidea in the British 

 Museum I have had as my chief aids the « Catalogue of the R c n t 



J. E. G ay (London 1855), and the ' Revision of the Echini ' of Prof 



U S 1872^'""itr'"f '' ''A' y^"^^'^^^^ P--' ^-bHdgt 

 u fe., l»/2-/3. It has been a difficult matter at times to hold a 



balance between systematists of such widely different prLcinles 

 Vefjr«' '"""^T' '^r^'^^'^^' o( the genus ^n-..L_r;6,,„, 

 Veirill, S. cannatus, and B. unicolor. As the Museum collection doe 

 not contain any specimen of B. obesus, I shall confine wha I have 

 p 35Vv "Vh? ^f"-'-'-\-e thus distinguished by igassL 

 (p. 35/).— The only features by which I am able to separati the 

 two undoubted species oi Brissus (B. carinatus and B u£color) are 

 the proportions of the anterior and posterior pair of a nbulacra^nd 



01 tne test. In B. carinatus the posterior ambulacra are much 

 shorter than the anterior pair, while they are nearly equal iiV^^ 

 color There is but one reentering angle in anterior Jart o fe ciok 

 tSouIT -^-^-'-'^^ra, while there are two iniJ. carinat^ 

 1 hough Dr. Gray distinguishes a larger number of species Cjust 

 the same, indeed as Agassi^ and Desor;, he seems to have had a beUer 



