PLATE 36. 

 Lovenechinus lacazei (Julien). Page 326. 



Fig. 1. Lower Carboniferous, Helsington Barrows, southwest of Kendare. Museum of Practical Geology Coll., Lon- 

 don, 16,301. X 1.7. Ambulacral plates at the mid-zone demi- and occluded, pore-pairs biserial; vent rally in 

 area B, all plates are primaries and pore-pairs uniserial for a short distance. In interambulacrum A, plates of columns 

 1, 2 and 3 are in place, but plates of column 3 partially and column 4 wholly are restored as indicated by dotted lines. 

 In the specimen spaces for these plates exist although the plates are wanting (pp. 328-329). Professor Duncan (1S89, 

 p. 200, text-fig. viii) described the ambulacral detail of this specimen as that of "Palaeechinus ellvpticus," thereby- 

 making much confusion. (Compare the type of that species, Plate 29, fig. 2; Plate 30, fig. 10; p. 308.) 



Fig. 2. Same specimen, showing primary ambulacral plates ventrally and the passage to demi- and occluded plates 

 higher up, from the area marked X in fig. 1. X 7. 



Fig. 3. Same specimen. X 7. Typical ambulacral plates of a half-area at the mid-zone, from the area marked XX 

 in fig. 1. 



Fig. 4. Same specimen as photograph, Plate 35, fig. 5. X 1.7. Four columns of plates in two interambulacral areas, in 

 area A the four columns are seen only dorsally. The single genital plate preserved has three pores (p. 328). 



Fig. 5. Same specimen. X 7. Detail of ambulacrum at the mid-zone, plates are narrow demi- and wide occluded in each 

 half-area. 



Fig. 6. Same specimen as photograph, Plate 35, fig. 4. X 1.7. Four columns of plates in three interambulacral areas. 

 Three oculars in place, all of which are exsert (p. 328). 



Fig. 7. Same specimen as photograph, Plate 35, fig. 6. X 1.3. Ambulacral plates demi- and occluded, four columns of 

 massive interambulacral plates in area A, a genital with three pores in place (p. 329). 



Fig. 8. Same specimen. X 3.5. Ambulacral detail of a half-area from the mid-zone, with wide occluded and narrow 

 demi-plates in a half-area (p. 329). 



Figs. 1-3 drawn by A. T. Hollick; all others by G. C. Chubb. 



