164 T. GiSLEN, 



of the proximal p — s is subject to too great a variation to be given any 

 great importance (compare Sp. 5 and 7). Considering that the locali- 

 ties for the tAvo species are widely separated, it is highly probable that 

 the differences in the number of cirrals [45 in the type specimen, 47 

 mm.: (32 — )43 — 53 in my specimens (37 — )46 — 57 mm.; ? — GO or 64 in 

 M- cyaneus, 50 — 65 mm.] and radials (5 — 6 in M. rotwidus type; 4 — 12, 

 usually 7, occasionally 5 or 8, in my specimens; and 4 — 7, usually 6, 

 often 7, occasionally 5, in M. cyaneus will turn out in the future to be 

 deviations of merely edafic value. For the present M. cyaneus ought 

 to be considered as a variety of M. rotundus. 



Metacrinus interruptus P. H. Carpenter. 



Fig. 157, 158; Photo 13—15. 



Syn. Metacrinus interruptus 1884 P. H. Carpenter Chall. Exp. Vol. 11, p. 



367; Trans. Linn. Soc. London Ser. 2. Vol. 2. p. 438 ff.; 1902 (04) Sperry Proc. 



Mich. Acad. Sci, p. 195; 1908 A. H. Clark Proc. U. S. Nat. Mus. Vol. 34, p. 528; 



1912 Crin. Ind. Oc. p. 269. 



From St. 9 (1 sp.), 45 (10), 56 (4), 58 (2), 59 (3) = 20 specimens. 



Sp. 1 (St. 45) For the L of the stem, the number and L of the 

 internodes and internodal joints, and the thickness of the stem in 

 this as in the following specimens see the table. The medium height 

 of the internodal joints l,i — 1,3 mm. 3 proximal nodals without cirri. 

 Full number of internodals in the 4"' internode. The distal face of the 

 nodal round. The intercirral tubercle on some nodals slightly promi- 

 nent. Stem rounded, tolerably smooth, but with small radial promi- 

 nences. Interarticular pores to the 8"' internode. 



Cirri 36 (VHP" cirrus-bearing node) 32 mm.. 37 (XI) 32 mm., 

 37 (XV). Extending over 2—2 '/4 internodes. I Br-s 7 (1 + 2, 4 + 5) 

 5 cases; 9 mm. II Br— s 9 (3 + 4) 1 case, 10:1 case, 11 (3 + 4) 8 

 eases; 10—12 mm. Ill Br— s 11 (3 + 4) 4 eases, 13(3+4) 8 cases, 

 15 (3 + 4) 5 cases, 17 (3 + 4) 2 cases, 18 (3 + 4, 14 + 15) 1 case; 10— 

 14 mm. IV Br 17(3 + 4) 1 case; 13 mm. Arms XLI, total L 90 mm. 

 L of the undivided arm 55 mm. Part of the arm with rudimentary 

 p— s 20 mm. I Br series smooth. II Br— s and the following segment 

 a little overlapping distally. 



