44 Proceedings of the Royal Physical Society. 



Height, 19 mm. Length, 46 mm. Diameter, 35 mm. 



„ 19 mm. „ 47 mm. „ 34 mm. 



14 mm. „ 36 mm. „ 26 mm. 



„ 11 mm. „ 29 mm. „ 22 mm. 



Distribution. — Only known from the Western Pacific — Japan to the 

 Sandwich Islands — and the Mergui Archipelago. 



20. Brissopsis luzonica, A. Ag. 

 A. Ag., Rev. Ech., p. 593. 



Locality. — V., Nauiegus Bay, mud and rocks. 



A solitary injured specimen belongs to this species. The anal plastron 

 is missing. The bare areas on the actinal surface with undiminished width 

 run from the mouth to the sub-anal plastron. 



Height, 23 mm. Long dia., 45 mm. (approx.). Trans, dia., 38 mm. 



Distribution. — Western Pacific, from New Zealand to Japan. This record 

 gives a great extension of range. 



21. Schizaster gibberulus, Agass. 

 A. Ag., Rev. Ech., p. 612. 

 Locality.- — VI., Kero-Nyuni Bay, sand, 5 to 10 fathoms. 



A single specimen. This species strongly resembles S. canaliferus. 

 The points of difference between the two species enumerated by 

 Agassiz (loc. cit.) are not of great value, for all are very slight. If anything, 

 the test of 8. gibberulus is narrower and more arched, the apical system is 

 slightly more anterior, and the bare abactiual surfaces are larger than in 

 S. canaliferus. The tubercles of the actinal plastron cannot be said to 

 be " coarser" and " more distinct," but the spines on the anterior half of the 

 plastron are conspicuously spathulate. The species is certainly very closely 

 allied to the Mediterranean S. canaliferus. 



Height, 18 mm. Length, ant. petals, 16 mm. 



Long, dia., 42 mm. Length, post, petals, 7 mm. 



Trans, dia., 35 mm. Length, odd petal, 22 mm. 



Distribution. — Red Sea and Ceylon. 



{Issued separately, 17th February 1!)10. ) 



