OP NEW SOUTH WALES. 159 



Swansea, Tasmania. Agassiz gives also West Coast of Australia, 

 New Zealand, and the Mauritius, as habitats. It was not obtained 

 during the Chevert's dredgings. 



Family Echiniixe, Agassiz, 1846. 

 Arcs of pores of three pairs only. 



Genus 1. — Temnopleurus, Agassiz, 1841. 



Small urchins, test generally regularly arched, and somewhat 

 conical. Actinal part more or less concave, tubercles crenulate, 

 imperforate, forming two principal vertical rows in each area, 

 pores in simple rows, but undulating and irregular, deep lateral 

 and vertical grooves at the angles of the plates. Spines long, 

 slender, fluted, those above shorter ; auricles broad, with high 

 connecting ridges and small foramen. 



Temnopleurus toruematicus. Klein. 



This, says Mr. A. Agassiz, is one of the earliest species figured 

 by old authors. It is easily recognized by its furrows. In the 

 I. space there are for each plate along the horizontal suture, two 

 deep rectangular furrows, separated by the principal row of 

 primary tubercles. Spines, long flattened, of a pink color, with 

 three or four purplish transverse bands. Actinosome, small, cuts 

 scarcely visible ; membrane, bare ; ten buccal plates, small, 

 prominent. Auricles, high, thin, with a high connecting ridge 

 and minute foramen. 



Specimens of this interesting urchin were dredged by the 

 Chevert expedition at Cape Grenville, Endeavour River, Darnley 

 Island and New Guinea. Generally occurring on sandy mud, 

 at from 10 to 20 fathoms. It was not hitherto known in 

 Australia, though not uncommon in the Indian Ocean, China, 

 Japan, &c. Diam. from 23 to 55 mil. 



Genus 2. — Microctphus Agass, 1841. 



Test stout ; tubercles few, small, leaving marginal bare spaces 

 in the I. area, but regular in the A. Porif. zones, narrow ; pores 



