8 



EUGASTER CONCINNUS (N. Sp.). PI. I, fig- 3- 



Disk flat, thin, alated, composed of very fine granulose plates. 

 Rays broad at their base ; flattened, rapidly tapering for two- 

 thirds of their length ; terminal third attenuate, rounded ; plates, 

 if any, undefinable. 



Dorsal side with four series of plates: two median and two 

 lateral ; the transverse sutures dividing the outer series are con- 

 tinuous with every other transverse suture dividing the central 

 series. Medial series with twice the number of plates of the 

 outer, and are raised above them. 



Sutures depressed. Surface of the plates rounded and finely 

 granular. 



The lateral series of plates decrease regularly in size after 

 reaching the disk until they end in a pronounced elevation 

 formed by the last pair of the medial series at a point about half 

 way from the border towards the center of the disk — measuring 

 at the narrowest part — where both series end. Between these 

 elevations the disk has a shallow, stellate depression with the 

 points opposite the several rays. The two outer rows of plates 

 apparently disappear towards the attenuate tip before the median 

 does so. The imperfect cast of the upper part of one of the rays 

 is all that is known of the ventral side ; this shows traces of an 

 alternating series of ambulacral plates. 



Marginal plates spiniferous. 



Length of ray one-half inch. 



This species agrees with the genus Eugaster in general form, 

 in the alate and granulose character of the flat disk, and in the 

 alternate arms. 



LECANOCRINUS SOLIDUS (N. Sp.). PI. i, fig. 4. 



Calyx funnel-form, evenly tapering from the arms to the base, 

 which is just the size of the column on which it rests. Column 

 large, massive. Arms wide. Entire surface granulose. 



Basal plates three, large, angles normal in number, upper angles 

 obtuse ; sub-radials five, medium size, about as high as wide ; 

 intercalated plate regularly quadrangular, somewhat oval in out- 



