the ' Challenger ' Monaxomda. 485 



size in cortex '35 by '01 millim., heads roundedly triangular j 

 in main skeleton 1-2 by '017 millim., heads pointedly oval. 



Localities. Off Marion Island, 50-75 fath. ; Station 320, 

 off the Rio de la Plata, 600 fath. ; Station 150, Southern 

 Ocean, 150 fath. (a slight variety with very minute, non- 

 tubular oscula) . 



Suhentes senilis ^ n. sp. 



Sessile, hemispherical ; covered with very long, delicate, 

 projecting spicules. Diameter, excluding spicules, ^ inch. 

 Skeleton composed of great divergent brushes of spinulate 

 spicules arising from various levels in the sponge, with shorter 

 spicules scattered between. Spicules spinulate : — (1) slender 

 with oval heads, length up to 3 millim., diameter '019 

 millim. ; (2) shorter, stouter, more fusiform, with constricted 

 neck and subglobular head, size about *5 by '015 millim. 

 (intermediate forms occur). 



Locality. Station 246, North Pacific, 2050 fath. 



Suherites perfectus, n. sp. 



Erect, lobose, but unbranched. Size 3^ by | inch. Brownish 

 yellow. Hard, firm, very minutely hispid. Dermal mem- 

 brane fairly distinct, but reduced to a network by numerous 

 pores. Oscula small, scattered, each on a small papilla. 

 Skeleton of radiating fascicles of large spinulate spicules, with 

 smaller ones in close-placed brushes at the surface. Spicules 

 spinulate, slightly fusiform, with well-marked subglobular 

 heads, sharply and rather abruptly pointed. Size in dermal 

 crust '28 by •0120 millim., in main skeleton 1*0 by '025 

 millim. (but* very variable). 



Locality. Port Jackson, 30-35 fath. 



Suherites axiatus, n. sp. 



Irregularly lobose or digitate. Soft and spongy, with a 

 thick dense axis ; hispid. Skeleton, a thick central axis of 

 longitudinally and closely-placed spicules, from which bands 

 of spiculo-fibre radiate to the surface, where they diverge. 

 Spicules spinulate, fusiform, with subglobular heads; size 

 variable, in the deeper parts 1*75 by '03 millim., towards 

 the surface '7 by '0126 millim. 



Locality. Station 320, off the Rio de la Plata, 600 fath. 



Suherites durissimus^ n. sp. 



Pedunculate, rounded, lobate. Light yellow. Hard, woody, 

 Ann. db May. N. Hist. Ser. 5. Vol. xviii. 33 



