500 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



IBr series and calyx elements as described. 



Ten arms TO mm. to 90 mm. long; first brachial short, slightly 

 Avedge-shaped, about three times as broad as the exterior length, en- 

 tirely separated interiorly b}^ the anterior apex of the IBr., the interior 

 edges diverging at an angle of approximately 90° or slightly less; 

 second brachial irregularly quadrate, slightly larger than the first ; 

 third and fourth brachials (syzygial pair) oblong, about half again 

 as broad as long; next three brachials approximately oblong, about 

 tM'ice as broad as long, then becoming obliquely wedge-shaped, and 

 after about the tenth triangular, about as long as broad, further out 

 on the arm becoming very obliquely av edge-shaped (almost trian- 

 gular) about as long as broad, and in the terminal portion longer 

 than broad. After about the sixth the brachials develop strongly 

 produced and overlapping distal ends. 



P^ 10 mm. long, with about thirty-five joints, moderately stout 

 basally and evenly tapering; terminal comb with 13 to 15 teeth, pre- 

 ceded by two or three more or less rudimentary; teeth spade-shaped 

 or triangular, longer than broad, slightly longer than the lateral 

 diameter of the joint which bears them, well separated, and incurved; 

 basal joints of the pinnule broader than long, the proportionate 

 length gradually increasing, so that the joints from the middle on- 

 ward are approximately squarish; the joints have prominent dorsal 

 projections with the apex at the distal end, and strongly produced 

 distal edges, these characters dying graduall}" away after about the 

 middle of the pinnule; P„ much more slender than P^, 7 mm. long, 

 the joints after the fifth squarish; first two joints with strong dorsal 

 processes or broad carinations, that of the second the stronger; fol- 

 lowing joints with rounded dorsal processes and prominent distal 

 edges; terminal comb rather long with sixteen fully developed and 

 five or six smaller and more rounded teeth; teeth proportionatel}^ 

 slightly longer and better developed than the teeth of P^; P3 about 

 4 mm. long, slender and delicate, the first two joints disproportion- 

 ately large, about half again as broad as long, the second with a much 

 produced distal dorsal angle or even distal half of the dorsal side; 

 third joint squarish; following joints slightly longer than broad; 

 third and following joints as far as the comb, as in P^, with strongly 

 produced coarsely spinous distal ends ; comb as in P^ ; P^ 3.5 mm. 

 long, slightly more delicate than P3, with no enlargement of the two 

 basal joints and no comb; first two joints short, third longer than 

 broad, the following increasing slightly in length, being about half 

 again as long as broad distally; third and following joints with pro- 

 duced and coarsely spinous distal edges; P^ similar to P^, 4 mm. long, 

 Avith sixteen joints, but slightly stouter; following pinnules similar 

 to P5, increasing very gradually in length; distal pinnules 8 mm. to 

 9 mm. long, slender, with about 21 joints, the first two not so long as 



