224 ACANTHOPLEURA. 



ules on the light bands, and toward the diagonal lines ; the lateral 

 areas have rather coarse, irregular granules. The girdle is covered 

 with alternate black and whitish patches of spines, these being all 

 curved like a Dentalium, rather blunt, the longer of them measuring 

 about 2? mill, in length. 



Another specimen, from New Caledonia, is similar, but has no 

 white patches on the girdle, the spines being 3-3? mill, long, and 

 black, often tipped with light color. 



The C. macgillivrayi Ad. (P. Z. S. 1855, p. 120) seems to be very 

 similar, to this variety, if not identical ; the original description 

 follows : 



C. macgillivrayi A. Ad. Shell oblong-oval, a little elevated ; 

 black, the central areas painted with two pale longitudinal stripes; 

 valves obtuse, under a lens seen to be most minutely granulated, 

 ornamented with concentric undulating rugose-grained line ; ter- 

 minal valve umbonated in front, umbo rather smooth, slightly pro- 

 duced ; girdle set with black, curved, slightly obtuse calcareous 

 spines. Feejee Islands, on the reefs ( J. Macgillivray). This is a 

 well-marked and handsome species, rather more than two inches in 

 length ; the surface of the valves is finely granulated and orna- 

 mented besides with subgranulated, wavy, concentric elevated lines ; 

 the central areas have a pale greenish band on each side of the 

 umbo. (Ad.~) 



Carpenter gives the following notes upon the types : Four spec- 

 imens, with A. Adams' autograph label. Bristles rather long for 

 the group, crowded and curved, black, but often tipped with light 

 as in brevispinosa. Sculpture with granules like borbonica in the 

 young, but soon changing to concentric wrinkles. Mucro prominent, 

 somewhat antemedian, the posterior slope convex. Jugal area 

 granose ; in one specimen only are there white streaks making V's on 

 the valves. Sculpture of central areas gradually changing from 

 grains into wrinkles toward the diagonals. Lateral areas scarcely 

 distinguished ; concentric wrinkles predominating. On the terminal 

 valves the sculpture is much finer, the rugulse breaking up into 

 grains. Inside color dark. The divergence is very variable, one 

 specimen being quite elevated, the others flatter ; measuring 103, 

 126, 114, 129. 



The granatus of Reeve seems to be an unusually granose example 

 of spiniger, such as that figured on pi. 48, fig. 28. The description 

 here follows : 



