42 R. KIRKPATPJCK. 



The inconspicuous oscular papillae are only about 4 mm. high, and are tightly 

 contracted. 



The tissue of the cortex is crowded with branched collencytes immersed in a 

 gelatinous matrix. 



I am indebted to Professor Dendy for pointing out to me certain resemblances 

 between the poral and oscular papillae of Latrunculia and the present species ; in the 

 case of both genera, too, the tissues are rich in pigment. Possibly we may have here 

 a clue to the true position of Latrunculia, the discasters of which appear to be spined 

 oxeas, or styles, the spines of which have become verticillate. 



The specimens were dredged near Winter Quarters, Flagon Point, 10-20 fms. 



Joyeuxia viridis Topsent was obtained from the Azores, 454-845 metres ; 

 /. tulndosa Topsent, also from the Azores, from 200 metres ; and /. ascidioides 

 (Fristedt) from Baffin Bay, 169 fms. (7. p. 445). 



CERCIDOCHELA Kirkpatrick.* 



1907. CercidocMa Kirkpatrick (10a. p. 2*4). 



Mycalinae with peculiar shuttle-shaped chelte or canonochelae,f with the single 

 central teeth from each end of the shaft joined together, and with a semi-circular 

 vertical lamella extending inwards from the shaft and from the dental bridge, so as 

 nearly to meet. 



CERCIDOCHELA LANKESTERI.| 



(Plate XIX., figs. 5, 5 A, and Plate XXIII. , fig. 5a-l.) 

 1907. Cercidochela lankesteri Kirkpatrick (10a. p. 284). 



Sponge elongated, slender, fusiform. Colour white ; consistence soft. Surface 

 smooth to the naked eye, but finely hispid under a lens. With several small scattered 

 oscules about 1 mm. in diameter, level with the surface. Flagellated chambers 

 aphodal, oval, 31 x 21 fj.. 



Skeleton formed of long longitudinal lines of spicule fibres about 100/ thick, not 

 forming a definite central axis, radiating out in plumose manner to the surface ; with 

 a few isolated spicules arranged in a scalariform manner at right angles to main fibres. 

 Spongin not perceptible. 



Spicules. Megascleres. Oxeas 452 x 19'5/j, curved at centre, attenuating 

 gradually to sharp points slightly planed away on inner aspect. Microscleres. 

 Canonochelae, somewhat shuttle-shaped, 45'5/x long by 22'75/w broad, with the two 

 teeth fused to form a bridge, and with a semi-circular lamella passing upwards from 



* KfpKis, t'So?, a shuttle. 

 t Kavtav, ovos. a shuttle. 



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



The canonochelae are, in this species, shaped like an oval basin with a truncated bottom, but they look 

 shuttle-like as commonly seen in balsam slides, viz., lying on one side with the lamellae uppermost (see XIX. Of). 



