Boone, Coelenterata, Cruises of "Ara" and "Alva" 69 



without exception a colorless pearly translucent cream, with the 

 mesenteries very distinctly delineated. The obconic forms have a 

 long diameter of 7 to 8 millimeters, exclusive of tentacles. 



References: Peponactis aequatorialis van Beneden, E., Ergeb. 

 der Plankton-Expedition der Humboldt-Stiftung, Die Antho- 

 zoen, 1897, vol. II, K.e., p. 109, pi. 9, figs. 9-16, text fig. 17. 



Zoanthactinaria 



Zoantheae 



Family: ZOANTHIDAE Dana 



Subfamily: Brachyeneminae Haddon and Shackleton 



Genus: GEMMARIA Duchassaing and Michelotti 



Gemmaria marquesana, new species 



•f 



Plate 22 



Type: Five large colonies, taken in Anaho Bay, Nuka Hiva 

 Island, Marquesas Islands, August 10, 1931. Deposited in the 

 Vanderbilt Marine Museum. 



Distribution: These rather large colonies are permanently 

 attached to large clumps of volcanic rock, collected, apparently by 

 breaking, in the littoral zone of Anaho Bay. 



Material examined : Type series, consisting of approximate- 

 ly two thousand polyps. 



Colour: Unrecorded. 



Technical description : The polyps are numerous, independ- 

 ent, attached at the base separately, closely crowded, but with a 

 thin, basal, encrusting membrane, or with the circumferal mar- 

 gins of the adjacent polyps united. The polyps vary from small 

 young ones bud-like between the side adjacent bases of large 

 older ones, arising from the membrane encrusting coenchyme. 

 The dead and somewhat shrunken specimens have an average size 

 mature polyps measuring from 18 to 25 millimeters high and 

 from 7 to 9 millimeters disk diameter. These polyps are of cylin- 

 drical form with the external surface of the sidewalls and base 



