the ^ Challenger^ Monaxonida. 329 



Pachychalina elongata, n. sp. 



Digitate, ramose ; branches long, diameter about ^ incli. 

 Compressible and elastic, tough and fibrous. Dermal mem- 

 brane with its supporting skeleton-reticulation forming a 

 tough skin. Vents small, scattered, chieflj on one side. 

 Skeleton: — {a) dermal, close-meshed, fibre echinated by 

 projecting spicules ; {b) main, a rectangularly meshed reticu- 

 lation of spiculo-fibre. Fibre "07 millim. thick, with much 

 spongin, spicules not confined to centre. Spicules slightly 

 curved acerates ; size "1 by 'OOGo millim. 



Locality. Station 162, Bass Straits, 38 fath. 



Pachychalina (?) punctata^ n. sp. 



Erect, flattened, lobate; thickness about \ inch. Dark 

 greyish yellow. Tough and leathery, compressible and 

 elastic. Surface uneven but glabrous. Vents minute, on 

 one side only. Pores unusually large, visible to the naked 

 eye as minute openings abundantly scattered on both sides, 

 lined by spongin, which projects into the cavity in large 

 bosses, frequently giving it a cruciform outline *. Skeleton : — 

 (a) dermal, close-meshed ; fibre echinated by projecting spi- 

 cules : (^) main, primary fibres '07 millim. thick, vertical to 

 surface, crossed by secondaries ; fibres polyspiculous, but with 

 a thick sheath of spongin ; numerous spicules occur scattered 

 between the fibres. Spicules sharp-pointed acerates j size 

 •09 by -0055 millim. 



Locality. Station 162, Bass Straits, 38 fath. 



Pachychalina (?) jpedunculata^ n. sp. 



Erect, stipitate, cylindrical, stalk short. Height ^\ inches ; 

 diameter of body | inch, of stalk \ inch. Greyish yellow. 

 Soft and spongy, elastic. Very minutely hispid. Dermal 

 membrane thin and delicate. Vents small, scattered. Skele- 

 ton of loose fibres and scattered spicules ; main fibres alone 

 distinct ; no special dermal skeleton. Spongin scanty. Spi- 

 cules rather slender, slightly curved, gradually sharp-pointed 

 acerates; size "5 by •017 millim. 



Locality. Kerguelen Island, 10-100 fath. 



Genus Dasychalina +, n. g. 

 Solid, coarsely spined on surface ; skeleton-fibres stout, 

 spicules polyserial ; amount of spongin variable, never very 

 great. 



* These projections doubtless serve to prevent the entrance of small 

 animals. 



\ baai's, rough. 



