PLATE 71. 

 Lepidesthes colletti White. Page 425 



Fig. 1 Same specimen as photograph, Plate 69, fig. 1. X 3.4. A very completely preserved specimen, oriented by the 

 Lovdn method as the axes are known from the presence of the madreporite. Sixteen columns of ambulacra! plates 

 a the mid-zone as seen best in area III. Ambulacral plates are all nearly or quite rhombic in form as are the younger 

 es dorsally m very large specimens in which they are hexagonal at the mid-zone (Plate 69 fig 7) There are but 

 ambulacral plates in a row in each area dorsally near the oculars, the number in the rows increasing p ; ,,si nfl 

 ventrally to the full number at or near the mid-zone. Four columns of plates in each interambulacral area strongh 

 .mbncatmg dorsally and from the center laterally and over the ambulacrals. In areas 1, 2, 3, and 5, column 3 has 

 der plates wh.ch nnbncate laterally in two directions; but in area 4, column 4 has the wider plates. (See also 

 Plate 69 fig. 4; Plate 70, figs 1 and 2.) Dorsally, four oculars are in place, which are indicated by cross lines- 

 adorally they cover the ambulacra and laterally the interambulacra in part on either side. Five genitals are in 

 ace; gen.tal 5 has three pores, genital 1 has two pores, and genital 2 shows fine madreporic pores, but no genital 

 pores, probably they are h.dden under the adjacent plates, genitals 3 and 4 are partially hidden and do no? show 



and rather scaly - This d ' rsai - is *- 



Lepidesthes extremis sp. nov. Page 430 



2 so ^ZTT! ^ P h t0graph ' P1 f e , 72 ' ^ ' HoIot yP- X 1.7. Internal siliceous mold of the ventral side 



the ambulacral pores are on the lower part of each plate. (Compare Plate 67, figs. 15 and 16 where in Let 

 desthes laevts the same ambulacral plates are seen in external and internal views.) There are sixtel columns of 



pla mnea r ' ' ^ C ~ - 



area farther ventrally. There are four columns of plates in the four interambulacra preserved and 



same number ,s g.ven m area E, which is restored as indicated by dotted lines. An impression of a mn , r 

 lantern ex^ts ventrally. Dorsal view of part of the same specimen, text-fig. 252 p 431 



