282 Mr. E. Kirkpatvick on the Monaxonellida 



My cale intermedia (O. Sell.), from East Greenland, noticed by 

 Thiele. The Arctic specimen consisted only of a fragment; 

 l)Ut the spicules, ■which are all considerably smaller than in 

 the Antarctic species, have the following dimensions : — Oxeas 

 4.^0 yu, long, 10-12 fi thick ; large anisocheles 50-60 fx long ; 

 small anisocheles 18 /u, long. 



Locality. Winter Quarters, 25-178 fath. 



Desmacidon mceandritia, sp. n. 

 The material consists of three subcylindrical fragments 

 tapering at the distal end. 



The consistence is hard and dense. The colour iu spirit 

 is dirty brownish grey. 



The surface is fairly uniformly level, and presents flattened 

 papillae or meandrine ridges, slightly roughened at the top by 

 ])rojecting oxeas (best seen on side view with a lens). 



The dermal membrane roofs over the grooves and spaces 

 between the papillse and ridges. The pores are mostly 

 circular and about 95 yu, in diameter. 



The small circular oscules, numerous and scattered, are 

 about 1 mm. in diameter. The skeleton is formed of a thick, 

 main axis, consisting of rather loose longitudinal strands ; 

 from this are given off at right angles cylindrical or lamellar 

 bundles of loose strands, which proceed to the surface and 

 form the papilla and ridges. 



Spicules. — Megascleres: oxeas, 579 X 39 /x, curved (usually) 

 or bent at the centre, with sharp, pointed ends. Microscleres : 

 isancoraj unguiferse, 26 fj, long and 15*8 fj, broad ; shaft 

 strongly curved and 3-52 /jl thick ; with usually five teeth or 

 claws, about 5*28 /x long, at each end, viz. a central, single, 

 and two lateral bifurcated teeth. 



The largest of the three pieces of this sponge is 6*2 cm. 

 long and IG mm. in diameter. The fragments appear to be 

 broken off from some branched specimen, and I shall refer to 

 them as branches. They are subcylindrical, being slightly 

 compressed in one plane. The chamber system is aphodal, the 

 flagellated chambers (44 x 29 /x) being pyriform. There is a 

 considerable amount of variation in the teeth of the isancorse, 

 the number varying from three to six, the most usual number 

 being five. 



In some respects the new species resembles Desmacidon (?) 

 ramosa (R. & D.), obtained by the 'Challenger'' from the 

 Cape of Good Hope and Marion Island. In both species 

 there is a central axis of longitudinal fibres, whence fibres 

 proceed to the surface at right angles. In the ' Challenger ' 



