Plate 3. 



Fig. 1. Most of the material composing the type colony of Tampsia lishoin, 

 artificially assembled, about three-fortieths natural size. Several individ- 

 uals of the colony had already passed into other hands when the picture 

 was taken. Page 6. 



Fig. 2. Tampsia iishopi Stephenson. Cross section of one of the loose indi- 

 viduals of the type colony, slightly enlarged, showing the notches of the 

 siphonal channels (E) and (S) ; the slit or sinus (a) which cuts into and 

 nearly through the shell along the bottom of the anterior siphonal channel, 

 and the fine wavy growth lines. Cat. No. 32499, U.S.N.M. Page 6. 



16 



