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MR. BRODERIP ON CLAVAGELLA,. 
6. Portion of a cavity occupied by a Petricola. 
y. Portion of the cavity of the larger Clavagella elongata. 
3. Broken group of Serpule. 
e. Group of tubules proceeding from the insulated shelly plate, fig. 1. e. 
. Internal view of the free valve of Clavagella elongata. 
. External view of the same. 
. Mr. Cuming’s specimen of Clavagella Melitensis. 
d. Termination of the posterior tube or siphonic sheath. 
e. A large group of tubules opening into the perforated shelly plate, at the 
anterior ventral part of the cavity. 
. Mr. Miller’s specimen of Clavagella Melitensis. 
e. A large group of tubules opening into the perforated shelly plate on the 
right side of the throat of the posterior tube. 
e, Another group of tubules opening into a perforated shelly plate at the an- 
terior part of the cavity. 
. Internal view of the free valve of Mr. Miller’s specimen of Clavagella Meli- 
tensis. 
. External view of the same. 
. 
