AMPHINEURA 221 



Sculpture of ovate to almost triangulate pustules arranged in diagonal and longitudinal 

 rows. There are thirteen longitudinal rows on each side of the dorsal area and the 

 innermost ones merge into folds along the sides of that area. The surface of the dorsal 

 area is sculptured with irregular longitudinal incised lines and pittings. A weak diagonal 

 fold traverses the lower part of the valve, commencing at the umbo and terminating at 

 the sutural slits. Colour of tegmentum in the holotype pale pink at sides, variegated 

 light brown and green medially, and pale buff with faint brownish longitudinal lines on 

 the dorsal area. Tail valve small, tegmentum broadly-ovate. Dorsal area broadly wedge- 

 shaped, mucro at lower third of height. Sculptured with six longitudinal rows of pro- 

 minent ovate to triangulate pustules. Sutural laminae, dorsal area and most of the 

 pustules pale buff to white, ground colour between pustules on lateral areas light brown 

 mottled with green. 



Length (tegmentum) 4 mm. ; breadth (tegmentum) 5 mm. ; maximum breadth 

 5-4 mm. ; height 2-5 mm. (Holotype, one median valve). 



Length (tegmentum) 1-5 mm.; breadth (tegmentum) 1-9 mm.; maximum breadth 

 2-6 mm.; height 1-3 mm. (Paratype). 



Habitat: Off Three Kings Islands, St. 934, 92 m. 



This is a benthic species allied to the littoral and shallower-water mariae (Webster, 

 1908). The new species differs in having a much wider sinus, more broadly wedge- 

 shaped dorsal area, and distinctive sculptural details, the pustules being more openly 

 spaced and the dorsal area with deeply incised lines and pittings reminiscent of 

 Craspedochiton. 



