es 



28 i Mr. B. Kukpatiick on the Mojiaxonellida 



Flagellated chambers 23 x 20/i ; diplodal. 



Skeleton. — Cortical skeleton formed of layers of strongyl 

 crossing each other at right angles. The walls of the oscular 

 and poral papillae supported by a layer of longitudinal 

 strongyles. The surface of the sponge hirsute, with a line 

 pile of strongyles standing out at right angles or obliquely. 

 Choanosome without spicules. 



Spicules. — Slightly flexuous smooth strongyles 850 /a long, 

 10 /* in diameter at the ends, and 13 /a in diameter at the 

 centre. 



There is one adult specimen 5 cm. long, 3"5 cm. broad, 

 and 3 cm. thick, with a deep groove on the under aspect, by 

 which it was probably attaclied to a worm-tube or stem of a 

 hydroid. There is also a small conical specimen, 6 mm. high, 

 attached to a piece of rock. 



I was at first disposed to regard this remarkable species as 

 a member of a new genus, partly on account of its very thick 

 rind, which is in places over a millimetre in thickness, and 

 partly because of the highly specialized poral papillae ; but 

 apart from these characters, the new form evidently shows the 

 closest affinities to Joyeuxla. The three hitherto described 

 species all have a rind enclosing a soft pulp, the latter being 

 without or almost without a skeleton ; then, too, the pulp is 

 highly coloured. Joyeuxia tubulosa, Topsent, and J. ascidoides 

 (Fristedt) have fistulas, which, however, appear to be oscular. 

 Two of the species, J. viridis and J. tubulosa, have strongyles ; 

 J. ascidioides has tyles and also chelai. Accordingly Topsent 

 places the genus near Desmacidon. 



The poral papillae attain a height of 1 to 1-2 cm. ; they 

 are expanded at the end. 



The inconspicuous oscular papillce are only about 4 ram. 

 high and are tightly contracted. 



Locality. Winter Quarters, 10-20 fath. 



Cercidochela *, gen. nov. 

 Mycalina3 with peculiar shuttle-shaped chelce or canono- 

 chelfe t, with the single tooth from each end fused, and with 

 a semicircular vertical lamella extending inwards from the 

 shaft and from the dental bridge, so as to nearly meet. 



Cercidochsla Lanlcesteri %, sp. n. 



Sponge elongated, slender, fusiform. Colour white ; con- 

 sistence soft. Surface smooth to the naked eye, but finely 



* KfpKis, ihos, a shuttle. t Kavav, ovos, a shuttle. 



X Named in honour of Professor Sir E. Ray Lankester, K.C.B,, F.R.S. 



