THE SPONGES. 



In addition to the discovery of new forms, some results of general bio- 

 logical interest have accrued from the study of the collection, and are dis- 

 cussed or stated under the respective species concerned. For convenience 

 of reference the more important of these facts may be here classified. 



Remarkable forms. Hyalonema pedunculatum, p. 15, is noteworthy for the 

 peculiar pedunculate form of body ; Sdcrothamnopsis compressa, p. 80, for the 

 shrub-like habitus in which it resembles the hitherto unique Sclerothamnus 

 clausii Marsh. ; Regadrella delicata, p. 32, for the character of the sieve-plate 

 region, which may be construed as representing a simpler (although not 

 necessarily a more primitive) phylogenetic condition than the otherwise 

 closely similar Regadrella phoenix 0. Schm. 



Distribution and Habitat. Thenea fenestrata 0. Schm., p. 87, hitherto known 

 only from the Atlantic and Caribbean Sea, is now recorded for the 



