28 Pl. KIRKPATRK'K. 



There are also several isoclieLu arciiat;i,' in wliirh the alse and (Icnticle are replaced 

 at one eud by a spoon-like lamella. 



The presence in Mya-iUa of chelate bijjocilla similar in many respects to those 

 found in the new species loplion spatulatus and /. Jliibdlo-dtgltatus is exceptional ; some- 

 what similar structures occur, however, in Alyxilln iophonoidef^ Svartzevsky (Mem. Soc. 

 Nat. Kicff, Tome XX., p. 340, PI. XV., fig. 27g-l) from the White Sea, but there are no 

 isochelse arcuataj. In other respects the spiculation of the new species is that of 

 a typical Myxilla. The isochelse arcuatae, though only half the length, resemble in 

 shape those of Myxilla nobilis R. and D., from ntf the Rio de la Plata, and M. diij'itdtK 

 R. and D., from the Cape of Good Hope. 



The specimen incrusting the rock was dredged from 254 fathoms, due west of 

 Balleney Island ; and the specimen incrusting the Polyzoon from AVinter Quarters, 

 No. (■) hole, 125 fathoms. 



LiSSODENDORYX Sl'ONCJIOSA. 



1887. MyxiUa spongiosa It. & 1). (15. p. l;!J, PI. XXVII., fig.s. ;3-;5f). 



1901. LissoclemJoryx sponyiosa, Topsent (29. p. 18). 



One small specimen and three minute fragments were obtained from three localities 

 in the neighbourhood of Winter Quarters. The complete specimen is cylindrical, 2 cm. 

 long, and • 5 cm. in diameter, and is attached by part of its length to the branch of a 

 I'olyzoon. The specimen is well preserved. The colour is white, an opaque white axis 

 showing through the transparent dermal layer. 



The spicular elements are similar to those of the Challenger type, and sigmata 

 occur in all, though in varying proportion. Topsent describes a variety of this 

 species from the ' Belgica ' collection, viz., L. spongiosn, var. as/(/inata, which is 

 wholly without sigmata. 



The specimens were dredged near Winter Quarters, (l) from near the ship, 20 fms. ; 

 (2) No. 12 hole, 25-30 fms. ; (3) McMurdo Bay, 4-10 fms. The species has been 

 found also off Rio de la Plata, GOO fms., Voy. 'Challenger.' The ' Belgica' collected 

 the var. asiymata in Lat. 71° 14' S., Long. 89° 14' A^^ in 450 metres. 



lOPHOX RADIATUS. 

 (Plate XXI., figs. 3, 4, 4a-c, and Plate XXV., fig. 4 a-c\) 



1902. luplion rudiatus, Topsent (29. p. 21, PI. 111., fig. 18). 



Specimens and fragments come from five dift'crent localities. They are mostly in 

 the form of small cylinders about 4 mm. in diameter and varying in length up to 5 cm. 

 The longest (XXI. 4) is 5 cm. long and 4 mm. broad, tapering to a point at one end. 

 The colour is dark brown, a dark axial core of choanosome showing throuo-h the semi- 

 transparent dermal meml)rane. One specimen, the largest (XXL, fig. 3), has broadened 

 out into an oblong loose rather flabby mass, torn at each end, 4 cm. in length and 

 2*5 cm. in breadth, and with a branch given ofi" on each side near one of the ends. 



