the ' Challenger ' Monaxonida. 475 



Clathria ? inanchoraia, n. sp. 



Erect, slender. Surface proliferating into inosculating 

 ridges. Dull yellowish brown. Tbugli and fibrous. Surface 

 minutely liispid. Fibre stout ; primary lines alone cored by 

 smooth acuates. Spicules : — (1) smooth acuates, size variable, 

 up to -54 by '024 millini. ; (2) sharp-pointed, entirely spined 

 acuates, size '072 by '006 millim. (echinating) ; (3) smooth 

 tricurvates, size '029 by "0016 millim. 



Locality/, Station 163 A, Bass Straits, 120 fath. 



Genus Ehaphidophlus (Ehlers). 



Differs from Clathria only in the possession of a distinct 

 dermal crust of outwardly-projecting spicules. 



Ehaphidophlus Jlltfer J n. sp. 



Irregularly ramose, gnarled. Greyish yellow. Hard. Sur- 

 face rugose and uneven. Dermal brushes densely packed, 

 arranged reticulately. Spicules : — (1) straight, slender, 

 gradually sharp-pointed acuates, base usually slightly spined, 

 size '2 by '0065 millim. (dermal) ; (2) smooth, slightly 

 curved, stout acuates, size "3 by '018 millim. ; (3) straight, 

 entirely spined acuates, size "1 by '01 millim. (echinating) ; 

 (4) minute palmate equianchorates, '016 millim. long ; (5) 

 long hair-like tricurvates, length '16 millim. 



Locality, Station 208, Philippine Islands, 18 fath. 



Genus PlumohalichONDRIA (Carter). 



Skeleton arranged in plume- like columns. Spicules of the 

 main skeleton acuate and acerate ; no special dermal spicule. 

 Equianchorate flesh-spicules. 



[Plumohalichondna mammillafa, Carter. 

 Locality. Station 162, Bass Straits, 38 fath.] 



Genus Plocamia (Schmidt). 



Skeleton-spicules dumb-bell-shaped and acuate j flesh- 

 spicules equianchorate and (usually) tricurvate. 



[Plocamia coriacea, Bowerbank, var. 

 Locality. Station 75, off Azores, 450 fath.] 



