84 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



Nec Holothuria crocea Lesson, 1830, p. 153, pi. 52. Suggested by Semper 

 but not accepted by later writers. 



Description. — Imperfectly known. Presumably the feet are restricted 

 to the ambulacra and the tentacles probably of equal size. The calcareous 

 ring is simple. The Polian vesicle is single; the stone canal attached in 

 the dorsal mesentery. Spicules perforated plates with laciniated edge and 

 one end narrower with long marginal spines, this end projecting through 

 the skin. 



Type. — Hamburg. 



Type locality. — Iquique, Chile. 



Distribution. — Coast of Chile. 



Depth. — Not noted. 



Specimens examined. — None. 



Remarks. — No specimen seems to have been secured since the type 

 was described. The type measured 3.5 cm. in length, possibly strongly 

 contracted. The interambulacral feet may have been overlooked. The 

 spicule figured could be interpreted as a degenerate plate from an aged 

 C. dubiosa. 



Genus 2. PENTAMERA Ayres, 1852 



Pentamera Ayres, 1852, p. 207.— Deichmann, 1938, p. 373; 1938a, 

 p. 105. 



Diagnosis. — Small to medium-sized forms; ventral tentacles small; 

 feet long, nonretractile, arranged in 5 bands but never scattered in the 

 interambulacra. Calcareous ring with long posterior prolongations on 

 the radials. Spicules 2-pillared tables or derivatives from these with the 

 spire reduced or developed as acornlike bodies. Feet with large end plate 

 and supporting tables, usually with well-developed spire; in some forms 

 the spire is more or less completely reduced. Tentacles with rods or 

 plates, in some forms devoid of spicules, at least in the older individuals. 

 Spicules in most forms numerous throughout the animal's life, in some 

 species the spicules are few and degenerate. 



Type species. — Pentamera pulcherrima Ayres. 



Remarks. — The diagnosis has been modified to include also Pentam- 

 era chicrchia Ludwig and P. zacae Deichmann, the former with few 

 and mostly reduced spicules, the latter with peculiar acorn-shaped bodies 

 — as it seems unwise for the present moment to segregate these two 

 forms which otherwise conform so well with the typical members of the 

 genus. 



