90 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



few feet on the dorsal side suggest P. heebe'i, while the description of the 

 spicules suggests P. zacae. As it is completely impossible to place the 

 species, the name must once and for all be rejected. 



Genus 3. NEOPENTAMERA, new genus 



Diagnosis. — Externally resembling Pentamera Ayres, with tube feet 

 restricted to the 5 ambulacra (?). Calcareous ring with well-developed 

 posterior prolongations. Spicules irregular, 4-holed, knobbed buttons; 

 feet with end plate and narrow ribbonlike rods, possibly derived from 

 tables. 



Type species. — Neopentamera anexigua, new species. 



Remarks. — The genus and species are based upon a number of small 

 specimens, apparently adult, secured by the Hancock Expeditions. As the 

 specimens are so small, there is of course the possibility that tube feet 

 may appear later in the interradials, which will necessitate a modifica- 

 tion of the diagnosis. The spicules bear some resemblance to those of 

 Eupentacta pseudoquinquesemita Deichmann from the coast of Alaska 

 but are so much smaller that I have felt justified in establishing a new 

 genus for this species. It cannot be confused with any other dendrochirote 

 form hitherto recorded from the Panamic region. 



Neopentamera anexigua, new species 

 Plate 13, Figs. 11-14 



Diagnosis. — Small form (few cm. long), externally as internally a 

 typical pentamerid. Spicules numerous, irregularly knobbed buttons or 

 plates. Feet with large end plate and ribbonlike supporting rods with no 

 indications of a spire. Introvert with plates and rosettes. Tentacles with 

 rosettes and delicate rods derived from rosettes. Tentacles dark brown. 

 Color white. 



Type. — Holotj^pe, AHF no. 24, one paratype. 



Type locality. — Velero III Station 683-37, outside of Concepcion 

 Bay, L. Calif., Mex., 12 fms., March 15, 1937. 



Distribution. — Known only from the type locality. 



Depth. — Taken at 12 fms. depth. 



Specimens examined. — The type and a paratype. 



Remarks. — The types are poorly preserved and measure only 2 cm. 



