ASTKKoihKA > >K NORTH PACTJTO \M' IMACBN1 WATBB8 PISE) s ", 



adoral carina e I three pain "f oloeelj contingent platei i" Large • • 



ni:iji >r pedicellariae oooui between the interaotinal spine*, i Verrill, pp. 177. 178 



1 have examined the type of Otihasteritu tMrriami figured by Verrill on Plate 18, 

 Figures i and 5, and the cotype, Plate 19, Figure* l and 2 (Verrill, 1914 The 

 pedicellariae and spines figured on Plate 76, Figures I to \<l. do not belong to a b| 

 men of 1 1 1 i — Bpeciee l>ut to /.. katheriiuu The specimen in question, No 1181, 

 Museum <>f Comparatn <• Zoologj . I have examined. It appears to be ti 

 imd it is so listed (under Asteriai bj Professoi Verril] p 112 The record of 

 mtrriiiiiii from the Gulf of Georgia, based upon the same specimen, is therefore an 

 error (Verrill, p. 17^ 



I have quoted Verrill's description of the type of Ortha • because 



my three specimens from Shelikof Strait are smaller, and were taken al some distance 

 from the i.\ i"' locality, ( ; Ijm i<r Bay. 



The Buperomargina] spines <.f the type are slender-conical (1 75 mm long] and 

 are noticeably smaller than adjacent dorsolateral Bpines, while the inferomarginals 

 (about :> nun. long) are not at nil conical but rather compressed-cylindrical, only 

 slightly tapered, with a blunt or subtruncate tip The actinal spine- I 

 more compressed and often chisel-shaped or alightlj gouge-shaped 



In the cotype I Glacier Bay) the proximal adambulacral plates are 



nearly nil diplacanthid, the furrow -pine of alternate plate- being slenderer 

 h little farther into the furrow. Near the end of (he ray the plates are alternately 

 monaoanthid and displacanthid. The abactinal spines show a alight fluting, well 

 marked on the proximal carinals It is only faintly risible on some of the spin< 

 the type, which, however, is not bo well preserved 



Crossed pedicellariae are verj numerous and occur in broad hands surrounding 

 the abactinal and Buperomargina] Bpint well ns in thick clusters on the outer 



side of the inferomargina] and actinal spine- Mixed with Btraight lanceolate pedi- 

 cellariae they form small clusters on the adambulacral spines. Between the primary 

 abactinal spine- there are numerous small clusters attached to smaller plates while 

 ondary abactinal spinules, Bmaller than the conspicuous primaries, carrj corre- 

 spondingly Bmall w tenths The ahnetimd pedicellarhie measure 0.30 or O.'il mill. 



long. (PI. 'J'.». fig. 3. 1 Those of the adambulacral plates are of about the - 

 hut somewhat different form, as i- usual. (PI. 29, fig 



The Btraight pedicellariae (pi. 29, fig are small (about 0.5 mm. I< 



compressed, ovate, or broad-lanceolate. They may have even more corapn 

 jaws than those figured and are very diminutive as compared to the broad-toothed 



one- of /. , triiculi ntn. The hit ■ -mien from Shelikof Strait (station 



1292) measu ■ mm., r 12 mm., the rays being slender, tapered, and of about 



the same form a- tho-e of the type of merriami figured by Verrill. 



The pedicellariae have the characteristic form, hut the Btraight ghtly 



longer (0.7 mm. in tin- intermargina] channel) Some of them have two or three 



teeth, although the jaws are narrow None of the interinarirmnl or actinal Btraight 



pedicellariae approach the large size and breadth <'f valve characteri 



The abactinal straight pedicellariae are quite typical, of a compressed broad-lai 



late or ovate form, with only a slightly crenulated distal margin. The abactinal 



