650 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



The only specimen in the collection with a definite locality is a 

 small and much broken one, which was dredged off Colombo Light, 

 Ceylon, in 26| fathoms. 



Family PENTACRINITID^. 



Genus HYPALOCRINUS A. H. Clark. 



HYPALOCRINUS SPRINGERI, new species. 



Stem slender, 4 mm. in diameter, rounded-pentagonal in cross 

 section, the sides smooth, flat, or very slightly convex; interarticular 

 pores extending to the eighth node; internodals, 10 (rarely 9 or 11) 

 of equal size, each face slightly over twice as broad as high ; nodals 

 slightly longer than the internodals, the small transversely oval cirrus 

 sockets touching the distal (lower) border and extending upward to 

 the proximal fourth of the joint face; neither the supra- nor infra- 

 noglals are modified in any 'way. 



Cirri slender and delicate, twelve times the diameter of the stem 

 (48 mm.) in length, with 50 joints; first joint very short, the following 

 gradually increasing in length to the fourth, which is twice as broad 

 as long, and further increasing to the sixth, which is about as long 

 as broad; following joints slightly longer than broad, but in the ter- 

 minal fourth becomiug again about as long as broad; from the twen- 

 tieth or twenty-third joint onward small but prominent median dor- 

 sal tubercles are developed; terminal claw small and blunt, conical, 

 twice as long as broad at the base, slightly longer than the preceding 

 joint. 



Infrabasals present, resembling those of Isocrinvs decoriis; basals 

 prominent externally, rhombic in outline, just contiguous by their 

 lateral angles, strongly convex exteriorly, bearing from one to three 

 prominent tubercles; in dorsal view the basals form a figure similar 

 to that made l)v the basals of Isoerinus decoru.^; radials large, strongly 

 convex proximally, slightly concave distally, about half again as 

 broad as long, ornamented with a few coarse, high, tubercles, irregu- 

 larly placed ; IBr, oblong, about twice as broad as long, without orna- 

 mentation; the lateral edges are just in apjjosition, but are not flat- 

 tened ; they are cut away somewhat anteriorly and posteriorly, form- 

 ing small rhombic pores on the lines of articulation between the IBr^ 

 and the radials, and the IBr^ and ..\ IBr. (axillary) short and broad, 

 triangular, twice and one-half as broad as long, the anterior edges 

 everted and produced into a high scalloped ridge ; IBr^ and o united 

 by syzygy; IIB 2, the distal edges of the joints standing out in high 

 prominent scalloped ridges; IIIBr 4 (3+4), the distal edges of the 

 IIIBr^, ., and 4 forming high scalloped vertical ridges. 



About twenty-five arms 140 mm. long, the terminal 80 mm. being 

 slender and with only very rudimentary pinnules, as in Metacrinus 



