NO. 4 ziesenhenne: new eastern pacific sea stars 211 



blunt, heavy, tapering spines with an enlarged bulbous base, inner spine 

 about 1.3 mm. long, outer spine 1.7 mm. long. Alternate adambulacral 

 plates carry on the furrow face a straight pedicellaria. Tube feet are 

 large, in 2 rows. 



Mouth plates rectangular, longer than wide ; each bears a large apical 

 oral spine and 2, sometimes 3, and often even a fourth oral spine. Inner 

 of furrow spines shortest, 1.3 mm. long; other spines larger, about 1.8 

 mm. long. These spines are flattened and widely flared out at the base, 

 then taper distally to a cylindrical blunt tip. Under high power all fur- 

 row spines are longitudinally ribbed and form a serrate edge on the spine 

 tip. 



Papular areas of the disk are small and irregular, bearing a few pap- 

 ulae and often free rudimentary ossicles. There are from 2 to 15 papulae 

 in the large, rectangular-ray papular areas. 



Straight pedicellariae lanceolate, slender, 0.4 to 1 mm. long, scattered 

 rather sparsely over plates, papular areas, and along the furrow face of 

 adambulacrals. The largest have 3 short, curved teeth at distal end, while 

 the smaller terminate in a short hook only. There are no hand-shaped 

 unguiculate pedicellariae such as are present in C. volsellatus, C. briareus, 

 and C. halicepus. 



Crossed pedicellariae of the spine wreaths vary from 0.27 to 0.45 mm. 

 long. Each jaw is armed with 2 large terminal teeth between which are 

 6 small, sharp, triangular teeth about one half the length of the termi- 

 nals. These teeth are curved downward and form an acute angle with 

 the shank. The shank of the jaw is armed with a single series of 6 (vary- 

 ing from 5 to 7) long, sharp, downward-curved hyaline teeth. The ter- 

 minal teeth of the jaw give the pedicellariae the appearance of a minia- 

 ture saber-toothed tiger skull. The pedicellariae of the furrow are 0.4 mm. 

 long; distal four fifths of jaw is serrated and terminates in one or more 

 long, curved claws. They are found on alternate adambulacral plates. 



Madreporites, 1 to 5, a large and 4 small accessory madreporites. The 

 largest is 4 mm. long and 2 mm. wide; it is composed of 2 small 

 madreporites fused together. The 4 smaller madreporites are 1.5 mm. in 

 diameter. All five are located about their diameter from the edge of the 

 disk. The striations radiate irregularly from the center, except the large 

 madreporite, where they run parallel transversely to the long axis. 



Color. — In life, abactinal surface creamish white with carmine stria- 

 tions running radially and transversely, more noticeable distally. The 

 radial and transverse rows of skeletal plates light gray, papulae and papu- 



