70 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 16 



Astrangia (Astrangia) gardnerensis Durham and Barnard, 



new species 

 Plate 5, fig. 27 



Corallites low, cj'lindrical, with flaring bases, connected by a com- 

 mon basal coenenchyma, average height of corallites above coenenchyma 

 1.5-2.0 mm, diameter of corallites 2.0-3.5 mm, depth of calices 1.5-2.0 

 mm ; septa 24-30 in number, interspaces about twice as wide as thick- 

 ness of primary septa ; septa slightly exsert, primary and secondary septa 

 more exsert than later cycles; first and second cycle septa reach colum- 

 ella, later septa extend about half the distance to the columella; inner 

 edges of second cycle septa with about 5 paliform lobes, those at top 

 rather short and with lower lobes becoming successively longer as they 

 approach the columella; first cycle septa rather narrow at top and for 

 about half of the depth to the bottom of the fossa with 3 or 4 serrations, 

 below this point with 2-3 paliform lobes ; inner edges of third cycle septa 

 moderately dentate, second and third cycle septa descending fairly sharp- 

 ly to bottom of fossa; septal faces with a moderate number of fairly 

 prominent granules; costae corresponding to septa, highly granulated, 

 moderately prominent when discernible, costal interspaces about two- 

 thirds as wide as costae ; columella composed of 6-8 anastomosing pali- 

 form lobes. 



Remarks: This species may be readily distinguished from A. {As- 

 trangia) pedersenii Verrill by the comparatively short corallites and by 

 the variation and profile of the primary and secondary septa. The highly 

 granulous character of A. {Astrangia) gardnerensis appears to be char- 

 acteristic also. The new species is separated from A. {Astrangia) cor- 

 onadoscnsis Durham by the closely set corallites and about 4 less septa 

 per calice. The corallites of A. {Astrangia) coronadosensis are more 

 diverging and isolated than in the new species. Some of the corallites of 

 the latter approach the A. {Astrangia) browni Palmer form by being 

 submerged to their tops in a mass of coenenchyma. 



Dimensions of corallite: Height 2 mm, diameter 3 mm, depth of 

 calice 2 mm. 



Hohtypc: AHF no. 7. 



Type locality: Sta. 31-33, Gardner Bay, Hood Island, 4 fms. 



Material examined: Stas. 31-33 (1), ZZZ-Z^ (1). Cat. nos. 30.1- 

 30.2. 



Distribution: The Galapagos Islands, shore to 4 fms. 



