CLARK: JAPANESE AND EAST INDIAN ECHINODERMS. 307 



Astriclypeus manni. 

 Verrill, 1867. Trans. Conn. Acad., 1, p. 311. 



3 specimens, 100-125 mm. in diameter. Sagami Bay, Japan. Owston 

 collection. 



Spatangus pallidus sp. nov. 



Test broad and flattened ; width (47 mm.) nearly equal to length (49 mm.), 

 but height little more than half as much ; greatest width just back of abactinal 

 system; greatest height (30 mm.) a trifle further back; at labrum, height only 

 26 mm. Cordate form of test not conspicuous as anterior ambulacral furrow is 

 shallow, only about 2 mm. deep at ambitus. Anterior petals a trifle sunken, 

 about 15 mm. long by 5 wide ; there are about 15 pairs of pores in anterior series, 

 and 18 in posterior. Posterior petals longer (17 mm.) and narrower (4 mm.), 

 scarcely sunken; there are about 18 pairs of pores in anterior series, and 19 in 

 posterior. Posterior end of test truncate, a trifle oblique, with slope downwards 

 and forwards; periproct 8 mm. broad and 6 mm. high, covered by 60-70 plates, 

 of which ten are much larger than others and form an outer marginal ring. 

 Ventral surface of test flat on each side of sternum, but latter conspicuously 

 keeled; keel about 11 mm. broad, 3 mm. high, and extending from labrum back- 

 ward 27 mm. to a point about 15 mm. from lower margin of periproct, which we 

 may call its posterior end ; keel is highest, 9 mm. in front of this posterior end ; 

 seen from side, therefore, in natural position of test, keel slopes downward 

 markedly from labrum for 18 mm., then slopes upward slightly for 9 mm., to its 

 posterior end, whence test curves abruptly upward 10 mm., to a point on upper 

 margin of subanal fasciole, about 5 mm. below periproct. Labrum slightly 

 curved, but little projecting, 13 mm. from ambitus in furrow. Actinostome little 

 sunken, about 8 mm. wide by 4 mm. long, covered by 30-40 plates, of which 

 most anterior are largest. Bare ambulacral spaces on each side of sternum, about 

 6 mm. wide. Remainder of test quite closely covered with tubercles, except 

 around actinostome; most of ventral surface is covered by primary tubercles 

 which, however, pass into secondaries posteriorly, laterally, and on crest of keel. 

 On dorsal surface, primaries few and inconspicuous ; there are about fifteen small 

 ones in posterior interradius arranged in half a dozen groups of two or three each ; 

 there are about ten slightly larger ones in each lateral interradius ; and in each 

 anterior interradius there are from twenty to thirty along margin of furrow, grad- 

 ually passing into secondaries near ambitus. Sutural lines on dorsal surface, 

 especially posteriorly, are sliglitly sunken and very distinct. Subanal fasciole 

 consists of a broad band (varying from 1.5 to 2 mm.), enclosing an oblong space 

 with rounded corners, about 13 mm. wide and about 8 mm. high (outside limits 

 of fasciole, therefore, 17 x 12 mm.). Uppermost point of fasciole is about 3 mm. 

 below periproct, while its lowest (or most anterior) point includes posterior end 

 of sternum. — Genital pores 4, close together, practically at centre of dorsal sur- 

 face. Whole test (except around mouth and on bare ventral ambulacra) thickly 



