xo. 1658. ALCYONARTA OF THE CALIFORMAX COAST— NUTTING. 727 



Plate XC. 



Fig. 1. Spicules of Telesto amhigua, new species. 



2. Spicules of Anthojnastus ritteri, new species. 



3. Spicules of Plumarella longispina. 



4. Spicules of Psaimnogorgia simplex, new species. 



5. Spicules of Psammogorgia torreyi, new species. 



6. Spicules of Stenogorgia hofoidi, new species. 



7. Spicules of Psammogorgia spauldingi, new species. 



Plate XCI. 

 Structural and histological details of Ptilosarcus quadrangularis. 



Fig. 1. Cross section of wall of rachis, through the band of zooids. 



c, canal from gullet of zooid to large longitudinal canal of rachis. 



c m, circular muscles lining cavity of rachis. 



ect, ectodermal lining of oesophageal tube or gullet of zooid (siphonoglyph) 



showing long cilia. 

 end, endodermal layer of gullet wall. 



gul, gullet of zooid in horizontal section taken across the siphonoglyph. 

 inv, involution of surface of zooid band. 

 I c, cavity of great longitudinal canals of rachis. 

 Imh, longitudinal muscle bands, in section. 

 m, mouth of zooid. 

 sp, spicules, in cross section. 

 sp t, spongy tissue below muscle bands. 

 2. Cross section of zooid, taken across gullet. 

 ect, ectodermal lining of siphonoglyph. 

 end, endodermal lining of intermesenterial chamber. 

 i e, intermesenterial chamber, 

 m, mesentery. 

 spgh, cavity of siphonoglyph lined with long cilia. 



