38 



ECHINODEEMATA. 



Class — Kehinodermata. 



Obdee — Geii^^oidea. 



Body fixed during the whole or a portion of the life of the animal 

 by means of a jointed stalk. 



Family — Peis^t aceinid^ . 

 Chalice small, stem pentagonal, surmounted by long arms. 



PENTACRINUS. 



Chalice composed of two series of plates, the lower ones small, the 

 upper large. 



1. P. StellatUS, sj). nov. Stem formed of pentagonal plates, the 

 sides of which are deeply indented, leaving five acute points ; from 

 each point radiates inward a double row of transverse teeth forming a 

 five-petaloid star, the median lines from the centre to the points being 

 smooth. Diameter, •4. 



Localities. — Curiosity Shop ; Chatham Islands. 



2. P. rotatUS, sp. nov. Stem sub-pentagonal, or nearly cylin- 

 drical ; joints with a five-rayed raised star, and a raised ring round the 

 margin, the rays of the star radiating to the sides of the pentagon, 

 making the interspaces sub-quadrate ; middle of each ray grooved, 

 centre depressed ; a series of teeth round the inner side of the raised 

 margin. Diameter, "3. 



Localities. — Pakau. 



ASTKOPECTEN. 



3. A. sandersoni, sp. nov. Eays not much longer than the 

 diameter of the disc, tapering rapidly with straight sides, and bordered 

 with tubercles ; lower surface with thick transverse plates, which are 

 shorter than in A, armatus. Diameter, 2| inches. 



Localities. — Waikari Eiver. Presented by W. Sanderson, Esq. 



CIDARIS. 



4. C. striata, sp. nov. Tubercles large, perforated, about five or 

 six in a row ; one tubercle on each interambulacral plate, none on the 

 ambulacral j depressions surrounded by small tubercles, and separated 



