DESCRIPTION OF SPECIES 61 



They are of a regular stellate shape, with about eight rays in optical section (Text-fig. 13 B). Small 

 spindle-shaped and irregular cells are also present in the test, but no pigment cells. 



Zooid (Text-fig. 1 3 A). The thorax often reaches 2 mm. in length. The abdomen, including the 

 long waist, is about the same length, or slightly more. These zooids are larger than Michaelsen's 

 (1924), which had a total length of 2-5 mm. In most zooids the oral siphon (o.s.) is quite long, tubular 



7.0 mm 



Text-fig. 13. Leptoclinides diemenensis Michaelsen (St. 935): A, zooid; B, spicule. 



to conical, and muscular, with six shallow pointed lobes. The base of the atrial siphon (a.s.) is at or 

 slightly posterior to the middle of the branchial sac. The siphon varies in length in different zooids, 

 but often is longer than the oral siphon. It is frequently, but not always, backwardly directed. Five 

 or six slender longitudinal muscles pass along each side of the thorax. Near the posterior end of the 

 thorax there is a conspicuous lateral thoracic organ (l.t.o.) on each side. The mass of spicules occupying 

 the cavity of the organ is about 125 ju in diameter. 



Branchial sac. There are twelve to fourteen long narrow stigmata in each of the four rows. The 

 dorsal languets are short, triangular, and blunt. 



