DESCRIPTION Of THE 60MA6TER ABBEN6I8. 79 



10. Lepidium latifolium. On sandstone rocks, above the Old Ford 



at Norham, on the N. Durham side. F. Douglas, 



11. Senebiera coRONOPUs. Waste ground at Haddon village, abun- 



dant ; and the only station in the interior of our district where 

 it has been observed. F. Douglas. 



12. Boyista oigantea. A specimen was gathered this autumn in 



the neighbourhood of Fowberry, which measured 4 feet 9 inches 

 in circumference. G. Darling, 



Description of the GONIASTER ABBENSIS, By Edward 

 Forbes, Esq., Professor of Botany in King's College, &c. 



Goniaster abbensis. 



G, corpore planiusculo, orbicularly angulis in hrachiis productis, 

 infra et supra tuherculiSf granulis stomatibusque vestito. 



Description. Upper surface. — Disc round, interrupted by the bases 

 of five short arms, each of which is as long as a third of the breadth of 

 the disc. Surface plane, thickly covered by granules, among which are 

 irregularly interspersed numerous mammilliform tubercles (transformed 

 spines), and at intervals spinules in pairs forming stomata (transformed 

 pedicellarice ?) of an ovate form. No appearance of an anal pore. Madre- 

 poriform tubercle nearer the margin than centre large, rugose. Upper 

 surface of arms (which are prolongations of the angles of disc) similarly 

 covered with the centre. 



Margin bordered by a double series of irregularly quadrate plates, 

 somewhat arched at their free borders, and each edged by a single row 

 of minute square granules. The upper series bear from one to four 

 mammiform tubercles : when more than one, two are usually larger 

 than the rest. On the lower series, the tubercles are usually more 

 numerous than on the upper. 



Under surface, — The triangular spaces between the avenues are 

 granulated ; among the granulations numerous large stomata, in form 

 linear and compressed, each placed in a smooth space surrounded by a 

 close border of flattened mammiform tubercles, those forming the lateral 

 borders largest. The avenues are linear, contracting towards the arms. 

 Suckers biserial. Border of avenues formed by transverse plates, each 



