121 



This species, tbougb its texture is dense and rather coarse, is 

 most nearly related to Flabellum laciniatum Phil. var. messum. 



Placotrochides, n. gen. 



As Placotrochus, but having a columella as large as Caryo- 

 phyllia. Distinguished froni Platytrochus by tbe absence of the 

 characteristic lateral costae , and by a certain, apparently normal, 

 irregularity of growth. 



8. Placotrochides dev.tiformis, n. sp. 



Corallum sitnple, free, compressed, acutely wedge-shaped, fairly 

 elongate, curved in the plane of the major diameter apparently 

 as a result of normal growth at one end. 



The costse, which correspond in number with the septa, appear 

 to have been low, broad, and equal, — except that one of the 

 lateral costae seems to have been more prominent than any ot 

 the others. 



The calicular orifice is ovate, not regularly elliptical; its axial 

 diameters are as 3:2, and the major axis is on a slightly lower 

 plane than the minor. 



The septa, which are coarse, are in six systems and three cy- 

 cles, with a fourth cycle in a few of the half systems. Those of 

 the first two cycles are the largest and reach the columella, their 

 surface being coarsely granular and their vertical edge wavy. 

 Those of the lower cycles do not reach the columella. 



The columella, which consists of numerous coarse auastomosing 

 curls, is elongate, prominent, and not very deep-seated. 



Height of corallum 8 millim.; major diameter of rnouth of 

 calicle 6 millim., minor diameter 4 millim. 



9. Placotrochides scaphula, n. sp. 



Corallum simple, compressed, extremely short, broad-based, 

 shaped like a flat-bottomed boat. 



