Plate 53 



Fig. 1. Sclerasterias heteropaes, young fissiparous phase, station 4431. Map of skeleton, base of 

 ray, carinals above, inferomarginals below, the spots showing position of spinelets; 

 base of ray to right; (', carinal plates; lep, dorsolateral transverse connecting ossicles; 

 S, superomarginals; /, inferomarginals. In this specimen R=9.5 mm., the dorsolateral 

 (adradial) plates have not yet developed; the superomarginal on extreme right is 

 second of series; ■ 12. 

 la. Same, a slightly larger fissiparous specimen with R= 11 mm., showing beginning of dorso- 

 lateral series (1)L); superomarginal on extreme right is the second of series; X 12. 

 16. Same, type, X 5. Diagram of the plates from inferomarginals to carinals, lettering as in 

 1 and \u. Base (if ray is on right, the first superomarginal shown being the twelfth. 

 The pebbled areas are shown enclosed by dots. lc. Same. Three inferomarginal 

 and actinal plates seen from below; A, actinal plates; AD, adambulacrals. 

 1./. Same. Actinal interradial straight pedicellaria from type, 0.6 mm. long, X100, and tip 



of another. 

 2. Sclerasterias tanneri, crossed pedicellaria, station 2021, from abactinal spine, X200 (0.28 



mm. long). 

 :;. Sclerasterias contorta, No. 1204. M. C. Z., off Barbados, inside of a single jaw to show enlarged 

 lateral tooth, ■ 2(111. 



4. Sclerasterias mollis, No. 1883, M. C. Z., Otago, New Zealand; abactinal pedicellaria, 0.27 



mm. long, ■ 100. la. Same, single jaw, X200. 



5. Stylasterias forreri, station 4550. Plates of actinal interradial area, X5; I., II., III., first 



to third inferomarginal plates; the others, act inals. 

 214 



