PLATE 45. 



Lovenechinus septies sp. nov. 

 Figs. 1-6. Same specimen as photographs, Plate 44, figs. 6 and 7. Holotype. 



Page 348. 



Fig. 1. Specimen drawn spread out on the Lov6n method. X 1.5. Ambulacra! plates ventrally are all primaries, pore- 

 pairs uniserial; at the mid-zone plates are demi- and occluded, with pore-pairs biserial. The interambulacra arc 

 remarkably perfect, but are restored partially as indicated by dotted lines. There are in each interambulacrum two 

 plates in the basicoronal row, three plates in the second row, and four plates in the third row, excepting area C, in 

 which, by rare exception, the fourth column does not originate until the fourth row. The initial plate of column 3 

 is hexagonal as usual in four areas, but in area C it is pentagonal (p. 68). Column 5 originates in the middle 

 line of each area, in the sixth row in four areas, but in the seventh row in area C. Column 6 originates at 

 or below the ambitus, and on the right of the center in areas A and G; but on the left of the center in areas C, E, and 

 I. Column 7 originates above the ambitus and in the center line of each area. A heptagonal plate lies on the left 

 or right ventral border of the initial plate of each column above the fourth. In area E there is an extra heptagon, H, 

 due to an exceptional pentagonal plate, P, in column 6. Ocular and genital plates are in place dorsally. 



Fig. 2. Shows primary ambulacral plates ventrally, which are succeeded by demi- and occluded plates. The ventral 

 developing stages of the ambulacrum are not as complete as in the lower species Lovenechinus missouriensis, Plate 42, 

 fig. 1. In the interambulacra the ventral developing stages are shown in two areas. X 4.4. (Compare text-fig. 17, 

 p. 59.) 



Fig. 3. Section of ambulacrum at the mid-zone. Pore-pairs biserial in peripodia; the suture line of the occluded and 

 demi-plates is serrate, not tongue-like as in L. missouriensis, Plate 42, fig. 2. X 4.4. 



Fig. 4. Showing primary ambulacral plates next the apical disc and an ocular plate covering the ambulacrum and 

 laterally the interambulacra in part on either side. X 4.4. 



Fig. 5. Section looking ventrally, showing the relative thickness of plates and ambulacrals beveled over the adambulacrals 

 on the adradial sutures. Interambulacral plates are shaded for contrast. X 3. 



Fig. 6. Genital and ocular plates with the dorsal contact of the coronal plates against the same. X 4.5. 



