64 NATURAL HISTORY OP 



shaped^ covered witli grains of sand or mud, hence 

 the specific name. Polypite entirely retractile, white, 

 with about 12 long tentacles alternately elevated and 

 depressed. 



Genus II. Perigonimus, Sars. {TrepC, all round, 

 yovi/jLO^, fruit-bearing.) 



As last genus, except that the reproduction is by 

 gonophores springing from the coenosarc, and developing 

 free swimming medusiform gonozooids. — T. H. 



This genus Prof. Allman places in his family Bou- 

 gainvillidce. 



1. P. BEPENS, T. 8. W. 



Eudendrium pusillum (T. S. W.), Atractylis repens 

 (T. S. W., Aid., McA.), P. pusillus {All.). 



Hab. : Firth of Forth (T. S. W.), Cullercoats (Aid.), 

 Shetland (All), Ilfracombe {T. H.). Height ^—i in. 

 Stem terminating in a cup-shaped expansion. Poly- 

 pites white, clavate, partially retractile, with 4 — 12 

 alternately elevated and depressed tentacles. 



2. P. MINUTUS, All. 



Hab.: Shetland (J.ZZ.). Height | in. Stem simple, 

 smooth. Polypite ash-brown, " with 7 or 8, rarely 12 

 tentacles, which are held straight but very irregularly 

 in distension'^ (AIL). 



This species is considered by Mr. Hincks to be iden- 

 tical with the preceding, but Prof. Allman holds it to 

 be distinct. He obtained it from the operculum of 

 living Turritellas in Busta Voe, Shetland. 



3. P. SESsiLis, T. S. W. 



Eudendrium sessile (T. S. W.), Atractylis sessilis 

 (T. 8. W.). 



Hab. : Firth of Forth (T. 8. W.). Stems short and 



