NEW MARINE MYZOSTOMA—McCLENDON. 65 



MYZOSTOMA DEANI McClendon. 



One specimen, 2.3 mm. long, from Crinoid Cat. No. 21706, U.S.N.M. , 

 from Station 3449, Straits of Fuca, 135 fathoms, August 28, 1891. 



One specimen, 1.3 mm. long, from Crinoid Cat. No. 21701, U.S.N.M., 

 Station 3350. Point Arena, California, 75 fathoms, September 25, 1890. 



MYZOSTOMA CYSTICOLUM CYSTIHYMENODES, new subspecies. 



One cyst from Crinoid Cat. No. 21703, U.S.N.M., from Station 2853, 

 olf the Trinity Islands, 159 fathoms, August 9, 1888. 



This variet}^ differs from 21. cystlcolum. in size (being larger) and in 

 the character of the cyst, which is not calcified as in the latter. 



The cyst is ovoid and protrudes from the ambulacral groove of the 

 arm of the Crinoid. It is 7.5 mm. long, and, in the slightly com- 

 pressed state in which I received it, 4.5 mm. ])road. 



The larger individual in the cyst is 7 mm. long and the smaller 



1.4 mm. in diameter. 

 Type.—^2X. No. 5781, U.S.N.M. 



MYZOSTOMA CLARKI McClendon. 



One cyst from Mttacrlnm sp.. Station 3741, May 17, 1900. Length, 



9.5 mm. The individual in the cyst was 6 mm. long. 



These Myzostomes, and the Crinoids from which they were taken, 

 are in the U. S. National Museum. 

 Proc. N. M. vol. xxxii — 07 5 



