CLARK : CRINOIDS. 239 



specimen, in regard to the disposition of the syzygia, most nearly agrees with 

 the first. 



The example from Station No. 4622 consisted merely of a calyx, without cirri, 

 and with the arms lost after the third or eighth brachials ; as nearly as can be 

 determined, however, it is identical with the preceding. 



In the more perfect specimen, the cirri had from forty-eight to fifty-four seg- 

 ments, while H. rhomboidea is given as having forty or less. This, however, is a 

 matter of no importance, for the three remaining cirri of the specimen are of the 

 type frequently seen on the extreme upper edge of the centro-dorsal in many 

 species of Heliometra (in the type H. eschrichtii, for example) which are some- 

 what abnormal in being longer than usual, slender, with more than the normal 

 number of segments; these must not be confused with the "long-mature " cirri of 

 Dr. Carpenter, which arise just below them. 



The following localities are added to the known distribution of Heliometra 

 rhomboidea : 



Station No. 4621. 6° 36' north latitude, 81° 44' west longitude, 36.4 miles from 

 land ; 581 fathoms. 



Station No. 4622. 6° 31' north latitude, 81° 44' west longitude, 40.8 miles from 

 laud ; 581 fathoms. 



Station No. 4630. 6° 53' north latitude, 81° 42' 5" west longitude, 556 fathoms; 

 green sand, large Globigerinae ; bottom temperature, 40.5° F. 



Heliometra juvenalis, sp. nov. 



Centro-dorsal hemispherical, bearing twenty to thirty cirri ; these are 10-12 mm. 

 long with fifteen to twenty segments, mostly somewhat longer than wide, but be- 

 coming squarish distally ; there are no dorsal spines, but the distal border of the 

 last five to ten segments is somewhat raised ; basals plainly visible as interradial 

 tubercles ; radials about twice as wide as long ; first costals rather shorter than the 

 radials ; axillaries pentagonal, about as long as wide ; the costals are rounded and 

 well separated laterally ; ten arms 75 mm. long, the first brachial short and wedge 

 shaped, the second larger and irregular, the four following oblong ; from this point 

 the brachials become obliquely quadrate, longer than wide, becoming more elongate 

 distally; first pinnule 2 mm. long, with four or five squarish segments; second 

 pinnule similar, but slightly longer ; third pinnule longer still, with eight segments ; 

 the fourth pinnule is 4 mm. long, with about twelve segments ; but the fifth is 

 6 mm. long, with fifteen segments, mostly rather longer than broad, of which the 

 third, fourth, and fifth bear a large rounded genital gland ; the fourteen following 

 pinnules are similar, and bear also large genital glands, after which the pinnules 

 become more slender, and do not develop genital glands ; syzygia occur in the 

 third, eighth, and twelfth brachials, and distally at intervals of three. 



Color (in spirits) dull yellow ; probably bright yellow in life. 



Types Cat. 283, 284 M. C. Z., from off Cape Raper, Davis Strait; 60 fathoms; 

 taken September 13, 1892, by Rev. A. M. Norman. 



