THE AUSTRALIAN MUSEUM. 



Podoclavella,* Herdman, 1890. 



Body extremely long and narrow, divided into thorax and abdomen, 

 and placed on the end of a long slender stalk. 



Test on the body thin, on the stalk thick and cartilaginous or horny. 



Mantle thin, musculature slight. 



Branchial sac with no internal longitudinal bars, and no papilliform 

 connecting ducts ; transverse vessels all equally wide, and bearing broad 

 horizontal membranes. Stigmata large. 



Visceral mass extending behind the branchial sac to form a distinct 

 abdomen as large or larger than the thorax, and followed by a well- 

 marked post-abdominal peduncle. 



There are two species in the genus, which may be separated as 

 follows : 



Colour light bluish green, tentacles in two rows, P. borealis, Sav. 

 (Arctic). 



Colour purplish, tentacles in one row, . . P. meridionalis, Herdm. 

 (Australia). 



Podoclavella meridionalis, Herdman | (1890). PI. Clav. II., figs. 14. 



External appearance. Body claviform, on a long slender stalk. 

 Anterior end narrow but truncated, bearing both the branchial and the 

 atrial apertures. Attached by lower narrower end of stalk. Surface 

 of upper part of body smooth, of stalk slightly corrugated transversely. 

 Colour of stalk yellow, of upper part of body grey, with a bluish purple 

 tinge in centre. Length over all about 7 - 5 cm. Length of stalk about 

 4-5 cm. Breadth of upper part of body 7 mm , average breadth of stalk 

 2 mm. 



Test thin but tough and cartilaginous over the wider part of the 

 body, thicker and more horny on the stalk. 



Mantle of a purplish colour, but thin and with little musculature, 

 probably continued down the stalk as a slender tube. Siphons well- 

 marked, with sphincter muscles. 



Branchial sac large. The transverse vessels are wide, and all of the 

 same size ; they bear wide horizontal membranes. The stigmata are 



* A new genus formed for one of the species in this collection, along with the Clnceliim 

 borealis of Savigny. First characterized in my paper on Ectcinascidia and the Clavelinidae 

 read before the Biological Society of Liverpool, in December, 1890 (.see Trans. Biol. Soc. 

 L'pool, vol. V., p. 144); denned more fully in "Revision," Journ. Linn. Soc, Zool., 

 vol. XXIII., p. 603, 1891. 



t Briefly diagnosed in "Revision," p. 603; the full description is now given. 



