ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATEBS FISHKK. 405 



Fig. 2. Lop^aifer/urci/h'jCTiexator; two paxillarepiiiea, enlarged. 2a. Same; tn-oaubambiilarral Mpineii, 

 typo, X 20. 26. Same; abactinal plates of ray, seen from inner side, the irregular plating 

 of the radial region shown at r, X 5. 

 3. PeribolasUr biserialis, cotype, dried; three adambulacral and adjacent inferoraarginal platC!<, 

 X lo. 3u. Same; adambulacral and inferomarginal epincs of undrie<l specimen, station 

 3317, X 8. 35. Same; mouth plates, X 8. 3c. Same; two papulie and fascicule of spine- 

 lets with enveloping tissue, station 3317, X 8. 



Plate 11.5. 



Fig. 1. Hymenastcr jierissonotus; station 3307; abactinal and marginal plates, to show the small size and 

 arrangement of former. The plates have lobes a trifle heavier than in typical southern 

 specimens, and in some specimens the plates are less joined along the radial region ; ad, 

 adradial series; r, radial eerie.'*; », superomarginals; inf, inferomarginals, X 5. la. Same; 

 inferomarginal paxilla. 16 Radial paxilla for comparison, taken on same trans ven<c line 

 and drawn to same scale, X (>. Ictol*". Same; superomarginal(c), adradial (rf), and radial (e) 

 plates of topotype to show the extremely slender lobes, X 6. 



2. PUraster trigonodon; spicules from supradorsal membrane, much enlarged. 



3. Pteraster temnochilon; spicules from supradorsal membrane, much enlarge<l. 



4. Pteraster marsippus; spicules from supradorsal membrane, much enlarged. 



5. Peribolasler biserialis; cotype; abactinal skeleton and fascicules of spinelets of dried specimen; 



papulae shown in one mesh; r, primary radial plate, X 8. 



Plate 116. 



Fig. 1. Pteraster marsippus; eleventh and twelfth adambulacral combs, the eleventh bent back to show 

 the small pocket external to aperture papilla; note the depressions in aboral surface of 

 adambulacral web; dotted line parallel to actinolateral spine shows where adambulacral 

 web joins membrane; depth of i>ouch shown by dotted line; ac, actinolateral spine; ap, 

 aperture papilla; p, pouch, X 5. 



2. Pteraster trigonodon; adambulacral armature, type; ac, actinolateral spine; ap, aperture; p, 



papilla, X 10. 2a. Same; mouth plates; complete armature of one plate only, X 6. 



3. Pteraster temnochilon; paxilla seen from side, showing also interior of nidamental cavity ; e, embryo, 



actinal side up; p, papula, X 10. 3a. Same; adambulacral armature; lettering a^ in fig. 2. 

 36. Same; suboral spine, X 10. 



4. Pteraster coscinopeplus; mouth plates, X 6. 



5. Lophaster furcHliger; fourth and fifth adambulacral, an intermediate (\r\t'), and second inferomar- 



ginal (in/) plates, X 10. 



Plate 117. 



Fig. 1. Pteraster jordani; adambulacral armature and part of adjacent actinolateral spine. X 5. la. 

 Same; abactinal paxilla with papula; the longer spine s is broken, X 5. 16. Same; mouth 

 plates, specimen from station 3346, X 5. 



2. Hymenaster quadrispinosus; station 3603; adambulacral armature, large Alaskan specimen, X 6. 



3. Hymenaster perissonotus; topotype; armature of third adambulacral plate; spines have been 



removed from second; X 6. 3a. Same; topotype; mouth plates, X 5. 



4. Hymenaster koehleri; mouth and adjacent adambulacral plates, X 3. 



Plate US. 



Fig. 1. Myonotus intermedins; mouth plates, X 6; some of the suboral spines removed from left pl.itf. 

 la. Same; fifth andsixthadaml)ularralandthird inferomarginal plates, X 6. 16. Same;abacii. 

 nal paxilla. Ic Same; abactinal paxilla from side. Id. Same; sixth suporomarginal plalo 

 with spines, from side, X 6. !<•. Thirty-fifth adambulacral plate with three furrow spinelets. 

 1/. Fourth adambulacral plate, one furrow spine, X 6. 



2. Nearchaster pedicellaris; mouth plates of type, X 6; some of the suborals have been rcmove<l from 



leftside. 



3. Nearchaster aciculosus; sixth superomarginal and inferomarginal from side, showing the armature, 



X6. 



