Plate 79 



Figure 1. Pisaster ochraceus forma ochraceus, Paget Sound; mouth plates and proximal adambula- 

 crals from side, :■'. 10. 



2. Pisaster brevispinus forma brevispinus, S:ui Juan Islands, Wash.; cluster of spines on 



an abactinal prominence, X10. 

 2a. Same specimen; mouth plates and adoral carina; eight pairs of proximal adambulacral 



plates lack spines. 



26. Same specimen, an abactinal crossed pedicellariae (0.24 to 0.27 mm.), X200. 



3, 3<i. Pisaster brevispinus forma paucispinus , Monterey Bay, abactinal spines, X10. 



3b. Same. Barclay Sound, British Columbia, X 10. 



3c. Forma brevispinus; abactinal spine, X 10, from large specimen, somewhat intermediate. 



San Juan Islands, Wash. 

 1. Pisaster brevispinus forma brevispinus, Monterey Bay; crossed pedicellaria, abactinal 



surface, > 200. 



la. Forma, paucispinus, Monterej Bay; skeleton of young specimen, baseof ray, X10 

 C, carina] plates; /;/.. dorsolaterals; /, inferomarginals; <S, superomarginals. The 

 tnadreporite is shown on right, at top of an interradial line. 



5. Pisaster brevispinus forma paucispinus, station 4219; a large crossed pedicellaria from 

 inferomarginal spines, X200; abactinal pedicellariae similar to 4. 



(i. Pisaster ochraceus, Monterej Bay; a furcate pedicellaria 0.25 by 0.25 mm., X 100. 

 334 



