164 T. GiSLÉN, 



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

 great importance (compare Sp. 5 and 7), Considering tliat tlie locali- 

 ties for the two 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.; ?— 00 or f)4 in 

 M- cyaneus, 50 — 65 mm.] and radiais (5 — 6 in M. rotundm 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. Caupenter. 



Fig. 157, 158; Photo 13—15. 



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

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

 Mich. Acad. Sei, 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 (4j, 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 

 cases; 10—12 mm. Ill Br— s 11 (3 + 4) 4 cases, 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. 1 Br series smooth. 11 Br — s and the following segment 

 a little overlapping distally. 



