SEA LILIES, STARFISHES, ETC. CLARK. Ill 



Genus Parechinus, Mortensen. 



Parechintjs notius,! 5^. nov. 



(Plate xli., fig. 1-3.) 



Test 28 mm. h.d. and 18 v.d. ; height, therefore, is .64 h.d. 

 Coronal plates thick, rough, though not actually sculptured, 

 20 in a column, each with a primary tubercle whose areola is 

 about half the height of the plate (in midzone) and on each 

 side of which are two secondary tubercles, not much smaller 

 than primary ; the 5 tubercles form a horizontal series ; 

 above midzone on a few plates the secondary tubercles are 

 somewhat more numerous and less regularly arranged, but 

 the uppermost 4 or 5 plates have only 3, 2, 1 or ; inter- 

 ambulacra about 12 mm. broad at ambitus. Ambulacral 

 plates 22, but little lower than the interambulacral, each 

 (in midzone) with a primary and 1 large secondary tubercle ; 

 the latter is near the inner end of the plate and disappears 

 abactinally ; ambulacra 7 mm. wide at ambitus ; poriferous 

 zones narrow (1 mm. wide), the arcs of pores vertical. 

 Abactinal system small and compact, 7.5 mm. across ; all 

 oculars exsert but I nearly in ; anal system large (4 mm. across) 

 nearly circular, covered by numerous (about 30) plates, 

 among which the nearly circular suranal is very distinct and 

 much the largest ; each genital plate carries 3 or 4 secondary 

 tubercles, each ocular, 1. Actinostome rather large, 11 mm. 

 across ; gill shts very slightly indicated ; buccal membrane 

 thin and perfectly bare, except for the 5 pairs of primordial 

 ambulacral plates, which are very near the mouth, but do not 

 form a closed ring ; they are densely covered with ophi- 

 cephalous pedicellarise. Primary spines 7-8 mm. long, abruptly 

 and not sharply pointed, each with about 10 longitudinal 

 ridges, low, rounded and close together ; secondary spines 

 similar but not so long and often somewhat swollen at tip ; 

 mihary spines very few, most of the relatively few mihary 

 tubercles bearing pedicellariae. Globiferous pedicellarise fairly 

 common, very similar to those found on the New Zealand 

 form {albocinctus) of P. magellanicus ; the blade is narrow, 

 slightly widened near tip, with a long and conspicuous end- 

 tooth and a smaller and more slender tooth on the left side, 

 below tip ; base of valve wider than in Mortensen's figure of 

 P. albocinctus ; tridentate pedicellariae very rare or wanting, 

 for I failed to find one ; ophicephalous pedicellariae very 

 abundant ; the valves are broadly rounded at tip and not at 

 all constricted. Colour of test, very pale brown ; spines 

 white. 



1. »'oT*os=southern ; in reference to its geographical position. 



