228 ME. W. PEECT SLADEN ON THE 



a lanceolate sbape, but with no terminal saccular prolongation. 

 Each series of spines is placed diagonally upon its plate, or oblique 

 to the line of the furrow. Aperture-papillae large and broadly 

 subspatulate or even stibrhomboid, expanded somewhat obliquely, 

 the pedicel seeming to be attached rather on one side. 



Mouth-plates rather broad, prominent aborally, having 5 or 6 

 short mouth-spines attached to the lateral aliform extensions, and 

 directed horizontally. Two short, robust, subcorneal secondary 

 mouth-spines are borne on the superficies of each plate — one near 

 the adoral extremity, and the other, which is thickest, placed mid- 

 way between this spine and the aboral extremity of the mouth- 

 plate. 



Actino-lateral spines long and well spaced, about 40 on each 

 side of a farrow, the 11th or 12th from the mouth being longest. 

 The spines within the disk do not quite meet in the median inter- 

 radial line ; and those along the outer third of the ray diminish in 

 length very rapidly ; they are, however, rather irregular in their 

 length throughout, which gives a ragged appearance to the fringe. 

 The spines are pointed at their extremity ; and the web is very 

 slightly indented between. 



Colour, in alcohol, yellowish grey. 



Station 158. Lat. 50° 1' S., long. 123° 4' E. Depth 1800 fms. ; 

 bottom temperature 0°"3 C. ; Globigerina-ooze. 



Hymekastee anomalus, n. sp. 



Marginal contour stellato-pentagonal ; interradial angles wide 

 and rather sharply and angularly indented, the lesser radius being 

 in the proportion of 63-65 per cent.; iE = 15 millim., r = 9-5 

 millim. approximately. Eadii subtriangular in outline, and 

 tapering to a fine extremity. Form very depressed, only slightly 

 elevated in the centre of the disk. Marginal fringe quite incon- 

 spicuous when seen from above. 



Supradorsal membrane with uniformly thick fibrous bands 

 closely reticulated, the network exhibiting a certain incipient re- 

 gularity of construction. The meshes or interspaces are large and 

 equidistant ; and a more or less distinct grouping round centres 

 is distinguishable, where the fibres become massed together — ■ 

 these thickened portions corresponding usually with the tips of 

 the spinelets, upon which they form a cap. Six to eight bands 

 usually radiate from these centres ; and if the plan just indicated 

 were regularly carried out, an arrangement of more or less dis- 



