32 PODOCOHYNID^E. 



P. carnea is furnished with the curious spiral appendages 

 first described by Wright as occurring on Hydr actinia 

 echinata. They are placed in a row round the opening of 

 the shell that supports the hydroid colony, on the edge 

 of the investing crust, and are generally curled up in two 

 or three coils. They have a white central core, and are 

 very slightly enlarged at the free extremity. I have also 

 observed in certain portions of the colony slender filaments 

 springing immediately from the crust, w r hich correspond 

 with the tentacular appendages of Hydr actinia. 



Hob. On stones in rock-pools near low-water mark, and 

 on old shells brought up on the lines of the fishermen, Inch 

 Garvie, Firth of Forth (G. J. A.) : on Nassa reticulata and 

 Turritella off Torbay in moderate depths, and in Swanage 

 Bay, Dorset : Oban, on operculum of Buccinwn (T. H.) : 

 Cullercoats (J. A.). 



The shell of Nassa reticulata is the favourite habitat of 

 this species, and I have found it generally present on spe- 

 cimens taken up with the dredge. The main lines of the 

 creeping stolon usually follow with much regularity the 

 transverse sutures of the shell, the intervening spaces 

 being barred by the cross fibres previously to the consoli- 

 dation of the crust. 



[Norway : Naples, in 10-20 fathoms, on shells tenanted 

 by the Pagurus (Sars) .] 



2. P. AREOLATA, Alder. 



HYDRACTINIA AREOLATA, Alder, Suppl. to Northumb. Cat. Trans. Tynes. Nat. 



F. C. v. 225, pi. ix. figs. 1-4. 

 RHIZOCLINE AREOLATA, Allman, Ann. N. H. for May 1864. 



Plate VI. fig. 1. 



POLYPITES small, white, columnar, slightly enlarging above, 

 and terminating in a conical mouth; tentacles 6-10, 



