NO. 1G03. FOVR NEW f^PECIES OF CRINOIDS— CLARK. 575 



RHIZOCRINUS BREVIS, new species. 



1S8S. RhizocriiiKs ntwsoni V. II. Carpenter, ChalhiKjcr Reports, XX\I, 

 Zoology, i». 2«7, Hr. 19; p. 2(;2 (iwirt) ; p. 263 (SS. Investigator, 15 miles 

 X. by E. i)f ranaiua ; 300 fatlioms). 



The two specimens figured by Carpenter, which were dredged by 

 Capt. E. Cole, of the cable ship Investigator, off Colon (not Panama), 

 appear to be well worthy of specific recognition. They are not 

 merely an extreme variety of rawsonii as supposed by Carpenter, but 

 represent a definite type, presenting valid characters. 



The calyx may be described as very short, conical, the width at 

 the distal ends of the radials twice that at the distal (lower) end of 

 the basals, one-fifth greater than the length ; the radials are slightly 

 longer than to half again as long as broad ; the basals are separated 

 by sutures. 



The stem is not figured ; but it is probably much like that of 

 R. roht(stus. 



The two figured specimens (of which the one represented by figure 

 19A may be considered the type) are in the zoological department of 

 the British Museum; two others are in the geological department of 

 the same institution. 



RHIZOCRINUS SAB^ffi, new species. 



Calyx four times as long as the diameter of the proximal part of 

 the column, and about three times as long as the diameter across the 

 radials; the basal cup is somewhat swollen, so that the greatest diam- 

 eter of the calyx is between the topmost columnar and the radials, 

 usually nearer the latter, instead of across the radials as usual; this 

 diameter is one-fifth greater than that across the radials, and is 1.8 

 times the diameter of the upper part of the stem ; basals separated 

 by distinct sutures. The calyx measures 4.5 mm. in length from the 

 top of the stem to the distal end of the radials. 



Stem very stout, as in R. rawso7in, the longest columnars being 2.6 

 mm. long by 1.7 mm. broad, with a rather prominent constriction. 



The arms resemble those of R. rawscmli, and are 19 mm. long from 

 the radials. 



Type-specimen.— Cat. No. 22700, U.S.N.M., from off Saba, 200 

 fathoms, taken by Capt. E. Cole, of the cable steamer Investigator. 



RHIZOCRINUS ROBUSTUS, new species. 



Calyx conical, moderately long, expanding evenly from the distal 

 portion of the basals to the radials; summit of stem proportionately 

 small, causing the calyx to appear disproportionately large; calyx 

 three-fifths to nine-tenths again as long as the diameter at the radials 

 and about five times as long as the proximal diameter of the stem. 



