1040 THE VOYAGE OF H.M.S. CHALLENGER. 



6. Dendrospyris ramosa, n. sp. 



Shell nut-shaped, spiny, with irregular roundish pores. Basal plate with three pairs of pores. 

 Apical horn cylindrical, spinulate, twice to three times as long as the shell. Feet as long as the 

 horn, S-shaped, widely divergent, irregularly branched, with widely distant pointed branches. 



Dimensions. Shell 0'08 long, 012 broad ; horn and feet 0'2 to 0'3 long. 



Habitat. North Atlantic, Station 353, depth 2965 fathoms. 



7. Dendrospyris arborescens, n. sp. (PI. 85, fig. 9). 



Shell nut-shaped, tuberculate, with subregular circular pores. Basal plate with four central 

 larger and ten to twelve peripheral smaller pores. Apical horn cylindrical, twice as long as the 

 shell, in the distal half spinulate or tuberculate. Feet about three times as long as the shell, 

 cylindrical, nearly vertical, in the distal half irregularly branched, with dense bunches of aggregated 

 blunt branches. 



Dimensions. Shell 0'07 long, 0'09 broad ; horn and feet 012 to 018 long. 



Habitat. Equatorial Atlantic, Station 347, depth 2250 fathoms. 



Genus 448. Dorcadospyris, 1 Haeckel, 1881, Prodromus, p. 441. 



Definition. Zy go spy rid a with two free lateral feet armed with a series of 

 secondary spines. Apex with a horn. 



The genus Dorcadospyris and the closely allied Stephanospyris differ from the other 

 Dipospyrida in the development of a series of secondary spines on the convex outer margin 

 of the two large curved lateral feet, which therefore appear semipinnate. In some species 

 this peculiar armature attains an extraordinary size, whilst the shell itself is very small, 

 as in Dorcadospyris dinoceras (PI. 85, fig. 4). 



1. Dorcadospyris dentata, n. sp. (PI. 85, fig. 6). 



Shell subspherical, tuberculate, with small regular circular pores. Basal plate with four larger 

 pores. Apical horn three to four times as long as the shell, slender, conical, smooth. Feet more 

 or less convexly curved towards one another ; the distal ends not crossed. In the convex edge of 

 each arm a series of five to ten smooth conical teeth, not longer than the shell. This common 

 species is very variable and often asymmetrical ; the figured specimen is an asymmetrical one, in 

 which the two arms exhibit different curves ; in the normal form both arms have the same curve, 

 now more, now less convex. 



Dimensions. Shell 0'06 long, 0'08 broad ; horn 0'2, feet 0'03 long. 



Habitat. Central Pacific, Stations 267 to 274, depth 2350 to 2925 fathoms. 



1 Dorcadospyris = Basket with two horns, similar to an antelope ; Sojxa?, awi/j/f. 



