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CLASS III.— ORDER I. 
OTAHEITAN. 
66. Spongia Othaitica. Crater-formed, divided, or 
deeply incised and lobed ; incrusted with large hol- 
lows, whose borders are raised, studded, and spongy, 
but without incrustation. 
Australasian and Atlantic seas. 
RIBBED. 
67. Spongia costifera. Turbinated; the external 
partitions furnished with longitudinal ribs rather sharp- 
edged, appearing like narrow planks ; texture fibrous, 
stiff, without incrustation. 
Southern Ocean. 
VASE-FORMED. 
68. Spongia labellum. In the form of a vase with 
an elliptical opening, whose borders are undulated 
and festooned ; sides stiff, resembling leather or 
pasteboard, with longitudinal nerves, from which 
spring smaller ones in trellis form. 
CUP-FORMED. 
69. Spongia pocillum. Irregularly formed like a 
chalice, stiff like woollen cloth, partly incrusted, 
and very porous; exterior surface finely cleft, the 
interior more bristled or prickly, and almost gra- 
nulated. 
Northern seas. 
VEINED. 
70. Spongia venosa. Turbinated and very wide ; 
thin, incrusted, and reticulated ; net- work formed by 
veins or small longitudinal nerves. 
Supposed to originate from the Indian Ocean. 
