LOVENIA SUBCARIXATA. 577 



considerable changes due to growth, the young being long, high, while larger 

 and older specimens become gradually broad, flat, and angular. 



Red Sea ; Australia ; Philippine Islands. 



Lovenia subcarinata 



! Spatangus subcarinatus Gkay, 1845, Eyre Voyage, I. 

 [Lovenia subcarinata Gray, 1851, Ann. Mag. X. H. 



Only small specimens of this species are known ; the test is high, elongate, 

 narrow. The anterior edge of the test is strongly keeled on each side of the 

 odd anterior ambulacrum. The posterior extremity of the test slopes gradu- 

 ally outward from the vertex to the upper edge of the subanal plastron. The 

 anal system is but slightly sunken, and the upper edge of the fasciole sur- 

 rounding the abactinal plastron is not lost in the depression of the anal 

 system. The shape of the actinostome is quite different from that of L. 

 elongata ; it is small, nearly triangular, with rounded edges ; while it is nar- 

 row, transverse, in elongata. This feature, and the re-entering posterior 

 extremity of L. elongata, in which the test slopes inward from the upper 

 edge of the anal system to the actinal surface, are sufficient lo distinguish at 

 once the two species ; for. in small specimens of L. elongata, no larger than 

 those of L. sul tea rinata, the posterior extremity, although more vertically 

 truncated, yet shows by the general position of the anal system, and the 

 shape of the actinostome and subanal plastron, the essential structure of the 

 larger specimens. 



China ; Japan ; Sandwich Islands. 



