No. 1685. REVISION OF CRINOID FAMILY COMASTERID^— CLARK. ^Ql 



broad, the third sliglitly longer than broad, the remainder becoming 

 elongated and about three or four times as long as broad distally ; 

 third and following joints with expanded articulations and coarsely 

 spinous distal ends. 



Color (in spirits). — Brownish white, the perisonie dark brown. 



Type.— Odt. No. 25457, U.S.N.M., from Grampus station 5104, off 

 the west coast of Florida; 51 fatlioms. 



6. COMISSIA, new genus. 



190S. Comaster (part) A. H. ("f-ark, Sinitlis. :Mis('ell. CoU. (Quarterly Issue). 

 LI I, 1). 202. 



Genotype. — Comissia liitkeni., neAv species. 



Description. — Centro-dorsal discoidal, the bare polar area broad 

 and flat, the cirrus sockets arranged in two closely crowded alter- 

 nating rows. 



Cirri XV-XXV, 10-24, resembling those of (Japillaster; the 

 fourth is a transition joint. 



Ends of the basal rays visible as j^rominent tubercles in the angles 

 of the calyx ; radials very slightly visible over the ends of the basal 

 rays, or quite concealed; IBr^ short and broad, closely united later- 

 allj^, more or less concealed by the centro-dorsal; Y^r^ (ax) triangu- 

 lar, about twice as broad as long, free laterally; synarthrial tubercles 

 prominent. 



Ten arms; first brachial short, slightly wedge-shaped, between 

 three and four times as broad as long exteriorly, interiorly united ; 

 second brachial larger and much more obliquely w^edge-shapc i : third 

 and fourth (syzygial pair) somewhat longer interiorly than exte- 

 riorly, about twdce as broad as the interior length ; following one or 

 two brachials almost oblong, about three times as broad as long, then 

 becoming triangular, about twice as broad as long, in the terminal 

 part of the arm becoming very obliquely w^edge-shaped, about as 

 long as broad ; brachials after the second wdth prominent and finely 

 spinous distal ends and a very finely tubercular or spinous dorsal 

 surface which in the terminal portion gradually become obsolete, so 

 that the ends of the arms are practically smooth. Syzygies occur 

 between the third and fourth brachials, again between the eleventh 

 and twelfth to fourteenth and fifteenth, and distally at intervals of 

 three oblique muscular articulations. 



Disk naked, or with small scattered calcareous granules; mouth 

 subcentral ; anal tube small and marginal. 



Pj the longest; following pinnules decreasing gradually in length 

 and slightly in stoutness to P^, which is less than half as long as P^, 

 with somewhat less than half as many joints; following pinnules 

 remaining similar for some time, then gradually becoming more 

 slender and increasing in length to about the length of Pj distally; 



