PLATE 1 O . 



Pago. 



Fig. 1. Hemiaster Humpiireysiana 5 



I, a. A side view of the type-specimen, tbe surface-markings of which were destroyed in break- 

 ing it from tbe rock. 



1, b. An upper-side view of the same. 



1, c. A posterior view of same, showing anal opening. 



1, d. Under side of same, showing oral aperture. 



1, e. A small part of the anterior ambulacrum, with two of the interambulacral plates on each 

 side, all magnified. 



If. A few of the ambnlacral pieces more highly magnified. 



1, g. A small part of one of the short posterior ambulacra from the lower termination of its 



petaloid area, with a few of the interambulacra on each side, all magnified. 

 Fig. 2. OsriiEA patina 10 



2, a. A hinge-area view of the upper valve of type-specimeu. 

 2, b. An outside or upper view of same. 



2, a, b (bis). Internal and external views of lower valve of type-specimen. (See bottom of 



plate. 

 F(G. :!• OSTREA PATINA, inf. A 18 



3, c, /. An internal and external view of tbe lower valve of the type of this var. (For upper 



valve of same, see fig. 1, a, b, of plate 11.) 

 Fir,. 1. OSTREA INORNATA - 14 



The type-specimen, showing tbe upper side of the shell with the two valves united. 



