■iG4 



s. (iOTO 



I have only one specimen of tins species, which was ori- 

 ginally in alcohol, but has since heon dried after treatment with 

 caustic potash. The dimensions are r==36 mm., E=:90 mm., giving 

 the radial ratio 2.5. 



Superoiiuirr/inah. — There are twenty of these, and the plates 

 are nearly triangular in form when viewed from the side, except 

 in the most terminal part of the arms, where they are nearly 

 square. They are completely covered over with flattened poly- 

 gonal granules, which are slightly larger in the central part and 

 smaller towards the periphery of the plates, and are entirely des- 

 titute of pedicellariœ. As seen from the surface the plates are 

 smaller in the interbrachial arcs than in the middle of the arms. 

 When denuded of the superficial granules the plates of the 

 interbrachial arcs are more than twice as broad as long, as meas- 

 ured on well exposed plates. The lateral margin of the body is 

 formed almost entirely by the superomarginal plates, and only in 

 the terminal upturned portion of the arms do the inferomarginal 

 plates show to any extent on the sides. 



Inferomargimils, — The inferomarginals are entirely confined to 

 the actinal side, and are rectangular or nearly square in the 

 greater part of the arms. In the interbrachial arcs they are nearly 

 twice as l)road as long. They are entirely covered over with 

 flattened granules exactly similar to those of the inferomarginals 

 and are like them entirely destitute of pedicellariœ. When the 

 granules are removed from the marginals, there is seen a series 

 of small intercalary plates between the two series. There are ten 

 or twelve of these in each interradius, but exceedingly small ones 

 may sometimes be seen stretching out to near the tip of the arm. 



Adamhulacral plates. — The adambulacral plates are narrow and 



