APPENDIX. 355 



acuminated eminences. This subdivision is further dis- 

 tinguished by the situation of the o^icells^ which are not 

 terminal but occur at irregular intervals on cells in the 

 coui'se of the series. They are of the same galeate form 

 as in many others of the Escharinse^ but are not as in 

 them placed above the mouth of the cell,, but below it in 

 front : and in all cases the shape of the ovicell-bearing cell 

 is much altered from the rest^ and in all the vittate 

 species the cell upon which the ovicell is produced arises 

 from its predecessor, not with the intervention of a short 

 tube, but is immediately sessile upon it, by a broad base. 



a. FenestratcB. 

 Cells large, fenestrate in front ; ovicells terminal. 



1. G. hastata, n. sp. ? 



C. bicvspis ^ Gray. Dieffenbach^s New Zealand, 

 Vol. ii. p. 293. 



Fenestrse, 7 — 9, disposed in a crescent, and with elon- 

 gated fissures radiating towards them from the median 

 line. Avicularia supporting a large pyi'amidal pointed 

 hollow process, compressed, and perforated before and 

 behind by five or six small circular pores. 



Hab. — Bass Strait, 45 fathoms, dead shells. 



Of a yellowish white colour, sometimes reddish. Forms 

 fine bushy tufts, with long wa^^ branches, arising from a 

 short common stem, and it attains a height of five or six 

 inches. It appears sometimes to be parasitic upon other 

 polyzoa, and is then much smaller. Its peculiar charac- 

 teristics are the perforated and striated scutiform area on 

 the front of the cell and the perforated, or apparently 

 perforated pyramidal lateral processes above each avicu- 

 larium ; these processes are much developed, and give the 

 cell the form of a broad inverted shear-head It seems to 

 be an abundant species in Bass' Strait, and it occurs also 

 in New Zealand. (Dr. Hooker^s Collection.) 



2 A 2 



