28 i Mr. E,. Klrkpatiick on the MonaxonelUda 



Flagellcated chambers 23x20/i; cliplodal. 



Skeleton, — Cortical skeleton formed of layers of strongyles 

 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 fine 

 pile of strongyles standing out at right angles or obliquely. 

 Choanosome without spicules. 



Spicules, — Slightly flexuous smooth strongyles 850 /* long, 

 10 /x in diameter at the ends, and 13 /u. 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 attached 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 

 ])artly because of the highly specialized poral papillae; but 

 apart from these characters, the new form evidently shows the 

 closest affinities to Joyeiixia. 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. Joi/euxia 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 chelaj. Accordingly Topsent 

 places the genus near Desniacidon. 



Tlie poral papillae attain a height of 1 to 1'2 cm. ; they 

 are expanded at the end. 



The inconspicuous oscular papillae are only about 4 mm. 

 high and are tightly contracted. 



Locality. Winter Quarters, 10-20 fath. 



Cercidochela *, gen. nov. 



Mycalinte with peculiar shuttle-shaped chelae or canono- 

 chelae f, 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. 



Cercidochela Lankesteri J, sp. n. 



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

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



* K€pKis, t'Sos, a shuttle. t Kovav, 6ms, a shuttle. 



:f Named in honour of Professor Sir E, Ray Laukester, K.C.B., F.R.S. 



