24 MARINE POLYZOA. 



larium from the truly articulated and moveable avicularia, in the 

 form of birds' heads, and which form does not occur in the genus 

 Scrupocellaria. 



a. Operculatse. Aperture protected by a pedunculate operculum. 



1. SCRUPOCELLARIA CERVICORNIS. PL LXII. 



Operculum large, expanded, marked with channels branching 

 like the horns of a stag. The marginal spine next above the 

 peduncle of the operculum bifurcate. 



Scrupocellaria cervicornis, Busk, Voy. of Rattlesn. i. 370. 

 Hab. Off Cumberland Island, 25 fathoms. 



A small delicate parasitic species, very transparent. The very 

 peculiar markings on the operculum at once distinguish it. The 

 upper margin of the mouth is furnished with five elongated spines, 

 the innermost of which is forked at the extremity. 



2. SCRUPOCELLARIA DIADEMA. PL XXVIII. figs. 1, 2, 3. 



Operculum slightly expanded at the extremity, entire, or ob- 

 scurely bilobed. A sessile avicularium in front, below the aper- 

 ture. Ovicell with a single row of four or five openings imme- 

 diately above the lower border. 



Scrupocellaria diadema, Busk, Voy. of Rattlesn. i. 370. 

 ? Acamarchis Bertholletii, Savig. Egypt, pi. 11. fig. 3. 

 Hab. Moreton Bay, R. 



3. SCRUPOCELLARIA BCRUPEA. PL XXI. figs, 1, 2. 

 Operculum reniform, entire ; four to five marginal spines above. 



Scrupocellaria scrupea, Busk, Ann. Nat. Hist. 2nd series, vii. 83. 



pi. 9. figs. 11, 12. 

 Hab. Britain (south?). 



4. SCRUPOCELLARIA MACANDREI. PL XXIV. figs. 1, 2, 3. 



Operculum expanded, irregularly reniform, entire. Margin of 

 aperture incrassate, granulose below with a minute spine above 

 and on the outer side, usually absent. Radical tubes toothed. 



? Crisia Delilii, Savigny, Egypt, pi. 12. fig. 3. 

 Hab. Coast of Spain, M e Andrew. 



IB. Inoperculatse. Without a pedunculate operculum. 



5. SCRUPOCELLARIA CYCLOSTOMA. PL XXVIII. figs. 4, 5. 

 Aperture subcircular ; margin thickened, with three small spines 



