162 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



Salmacis sulcata. Agass. 



This species is closely allied to S. bicolor. It differs according 

 to A. Agassiz in having a more deeply lobed and slightly longer 

 actinosome ; the abactinal system is less prominent, and some 

 other details. The test when dry, a yellowish green, with 

 sea green band on the I. area, with spines of the same 

 color at the base tipped with dark violet ; they are sharper, 

 and more uniform in size. In some, however, they were 

 cream colored, and banded with 5 or 6 dusk brown lines. Diam., 

 48 to 67 ; height, 27 to 40 mil. New South Wales coast. 

 Agassiz says that the young, figured by Savigny, would be 

 readily mistaken for young Echinus, as the difference in size of 

 the vertical rows of the primary tubercles is not seen at that 

 age. 



Genus 4. — Mespilia. Desor, 1846. 



Small ball-shaped urchins, with a thin test, and the median 

 areas quite bare as far as the ambitus, and whole lower surface 

 tuberculated and covered with spines. Porif. zones broad ; pores 

 arranged in two irregular vertical rows. Spines short, hair-like, 

 slender. Actinosome decagonal, small, membrane bare. Auricles 

 high, ridge low, foramen large. 



Mespilia globulus. Agass. 



This beautiful urchin is easily known. It is small, and round 

 as a ball. The bare spaces are dark grey green, the spines, closely 

 packed, and of uniform length, are light green at the base, and 

 banded at the end with white or reddish purple. The bare spaces 

 have a silvery appearance on the dry specimens from the 

 pedicellarise. It is not common ; there are specimens in Mr. 

 MacLeay's Museum from New Caledonia. Agassiz gives the 

 Pacific, Japan, China, and Philippine Islands as its habitat. It 

 has been found between Brisbane and Rockhampton — at Lady 

 Elliot Island. 



Genus 5. — Amblypneustes, Agass, 1841. 



Urchins spherical, or even with a greater altitude than breadth. 

 Test thin, anal system small but prominent ; actinosome small 



