S. YOSHIWAEA. 



tinetly greater width than height. The inner plates of anal system are not very 

 small compared with outer plates ; width of interambulacrum generally greater 

 than that of ambulacrum, being 4 — 5.4 times as measured at ambitus from tests 

 of 25.5 — 66 mm. in diameters. Ambulacrum very slightly wavy, with very 

 slightly sunken poriferous zone, and never so strongly curved as in 6'. grandis, 

 Död. [nterporiferous area tuberculated with two outer and four inner longitudi- 

 nal rows, the latter carrying very small scaly spines less than one quarter as 

 long as the outer ones. All miliares on the test and abactinal system smaller in 

 size than in S. grandis, Dud. Js'eck of primary spine white. Spines near peri- 

 stome not flattened even in comparatively young specimens (25.5 mm. diam). 

 Loc. : Sagami Sea. 



3. Cidaris (Porocidaris) mieakïèiws, nov. sp. 



Test more flattened than in C. elegans, A. Ag. Covering membrane (is- 

 pecially on abactinal side) and the collar of spine deep brown. Basais not ex- 

 tending to peripheral margin of anal system. Both ambulacral and interambu- 

 lacral plates at ambitus without any bare median space. There is one vertical 

 row of tubercles between the scrobicular circle and median interambulacral 

 suture. Primary spines white, with a brownish collar 4 mm. high in the longest 

 spine belonging to a test of 39 mm. in diameter, which measured 100 mm. 

 Secondary spines brownish ; those on ambulacrum arranged in a single vellicai 

 row in each zone. 



Loc. : Sagami Sea. 



4. Mespüia levüuberculatus, nov. sp. 

 Test globular, reddish with yellow or green bare space. Actinal side not so 

 swollen as abactinal side, but not depressed. Primaries and secondai ics very 

 small, not perforated or crenulated, thus differing from any other species of 

 Mespüia, arranged in each interambulacral zone in two horizontal rows (adorai 

 row having only secondaries) and in five vertical rows at ambitus. Ambulacral 

 pores three in number in each plate, forming two vertical rows. Poriferous zone 

 traversed by two regular or irregular vertical rows of tubercles. On the am- 

 bulacrum and interambulacrum there are found bare median spaces crowded 

 with brown pedicellarue. On the actinal side, however, these bare spaces together 

 with the pedicellarue are absent. Spines longitudinally striated with orange 



