NORTH PACIFIC HOLOTHURIANS— EDWARDS. 



51 



however, they range from 20 to 40 mm." Consequently this new 

 species is over twice the greatest and seven times the average length 

 of 0. Isevis. 



Color. — In alcohol, vinaceous with spots of burnt sienna scattered 

 all over the body and the tentacles. 



Tentacles. — Twelve, generally with 8 to 12 digits; in one specimen 

 some tentacles have 6 digits; in another, 14. 



Spicules of the Ijocly wall. — \^4ieels in all respects like those of C. 

 Icevis. (See Duncan and Sladen, 1881, Plate I, tig. 18.) Diameter, 0.08 

 to 0.12 mm.: average, 0.1 mm. The wheel-papillae are arranged in 



Fig. 1.— Chiridota albatrossii. a-c, Calcareois rods, (x 340.) 



three rather irregular, more or less distinct, longitudinal rows in the 

 dorsal inter-radii, while ventrall}^ they are few and scattered. In the 

 fragment of the body, 17 cm. long, there are about 68 to 7.5 in each 

 row. In C. Imids there are 20 to 30 in each of the three rows 



Iiods. — In the anterior l>od3" wall. In the longest specimen with 

 tentacles these rods are at the posterior end of the piece, 4 cm. from 

 the tentacles. The rods are straight to crescentic (tig. 1^/), ends 



Fig. ^. — Chiridota alb.\trossii. r/-/, Calcareoi's bods. ( x 340. 



spinose, now one (tig. lb) and then both (tig. Ic) bifid, while very 

 rarely the branches unite to make pei'f orations. Often there is a 

 small cluster of spines at the middle (tig. '2<I). 



Occasionally the rod has compound curves (fig. 2e^), and very rarely 

 it is triradiate (fig. 2/). 



Size of rods in rnilUm.ete7's. — Length, 0.05- to 0.15, average, 0.1; 

 width, 0.007 to 0.02; average, 0.01; width of branched ends, up to 0.06. 



Sjncules of the tentacles. — Rods similar to those in the body wall. 



Calcareous ring . — Like C. Isevis. 



Polian vesicles. — In the four specimens, 10, 16, 17, and 18, scat- 

 tered from right to left dorsal radius. In one specimen the longest is 



