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but perceptibly coarser. The plates next the adambulacrals, with 

 very few exceptions, bear each one valvate excavate pedicellaria 

 placed either parallel or obliquely to the ambulacral furrow, 

 forming a conspicuous series. Many of the other plates also bear 

 similar pedicellariœ, which are larger and more numerous around 

 the mouth. 



One of the specimens, which had lain in formalin for some 

 tim.e, and was subsequently transferred to alcohol has a soft 

 pale rosy colour. It was probably red in life. 



One specimen in S.C. ; one sent to Dr. W. K. Fisher of 

 Stanford University, Cahfornia. 



Pentagonaster arcuatus Sladen. 



(PL XI, figs. 171-177.) 



This species was first described by Sladen as follows [ '89, p. 277] : 



" Pentogonastcr arcuaim, n. sp. (PI. LII. figs. 1 and 2 ; PI. XYIII. figs. 

 5 and 6). 



" Piavs five. Pt=45 mm. ; r = 23.5 mm. Pt==1.9o r. The miuor radius is 

 tlir.s in the proportion of 52.2 per cent. 



" General form flat, but moderattJy thick. Marginal contour stellato- 

 pentagonal, with the radial angles produced and tapering to an acute 

 extrem it}-, Avhicli is slightly turned upward. Intcrbracliial arcs widely 

 rounded. INIîirgins equally rounded abactinally and actinally. Abactinal area 

 not elevated above the level of the marginal plates; slight depressions 

 are x^i'^sent in tlics inten-adial areas near the margin, which are probably 

 indicative of a hmited capability of inflation. Actiual area subplane, with 

 small well-deÊLued depressions external to the mouth-plates. 



"The abactinal area is covered with small, subcircular plates, closeh' 

 placed, united by slioi-t, narroAV prolongations, which leave interspaces for 

 comparative!}' largo papuliX3 in the radial regions. The abactinal plates ex- 



