Captain P. P. King on the AnimaUy ^c, 9t 



centrum superne attingentes. Inter-scapulares minimse. Amhii* 

 lacra elongata, gradatim superne latiora, ad basin prominentia. 



In general form this species is elliptical, or oblong ; truncated and pen- 

 tagonal at the base; Xho. 'pelvis is small and concave; the scapulars large, 

 elongated, decussately striated and longitudinally rugose, reaching to 

 within a short distance of the upper centre. The interscapulars are very 

 small, and the ambulacra elongated, increasing, in vndth towards the 

 upper part, and prominent at the base. 



Mr. Gilbertson observes, "the upper division of the plates" (inter- 

 scapulars) " of this Pentatrematite is very near the apex, and can 

 *' scarcely be distinguished without a good magnifier; one of the top 

 " plates has been removed by accident, and will direct your attention to 

 " the division of the others," The species may, moreover, be distin- 

 guished from P, elUptica by the greater width of the ambulacra at the 

 ppper than at the lower part. 



Besides the three new species described above, which will be figured in 

 the supplementary plates, Mr. Gilbertson has communicated another, 

 which appears to be an elongated variety of P, eUipticas,. inasmuch as it 

 differs merely in general form from the ordinary specimens of that 

 species. 



Art. X. Extracts from a Letter addressed by Capf. 

 Phillip Parker King, R.JV,, F,R,S. and L.S., to. 

 N. A. Vigors, Esa., on the Animals of the Straits of 

 Magellan, 



[Concluded from Vol. III. p. 432.] 



38. A species of Columha.'—So many species of this femily have 

 lately been described, and particularly from South America, that I hesi- 

 tate in assigning this bird a new name. It is different, however, from 



