NO. 3 DEICHMANN : HOLOTHURIOIDEA ; PART I, DENDROCHIROTA 107 



tables with oval disk with 4 holes and a well-developed handle on the 

 inner side; spire tapering, ending in a few teeth. Feet with well-devel- 

 oped end plate and numerous supporting tables normally with 3 rods in 

 the spire, which rapidly tapers into a short spine with a few teeth on the 

 tip. Introvert with oblong tables with a varying number of holes. Ten- 

 tacles packed with perforated plates of different sizes, with numerous 

 holes; rosettes and delicate rods are present in the terminal branches. 



Type. — Holotype, AHF no. 32, 1 paratype. 



Type locality. — Station 272-34, Tenacatita Bay, Mex., 25 fms., 

 March 4, 1934. 



Distribution. — Tenacatita Bay, Mex. 



Depth. — From 25 to 35 fms. 



Specimens examined. — The type and one paratype from the Velero 

 Expeditions : 

 272-34. Tenacatita Bay, Mex., 25 fms., dredging off Navidad Head, 



March 4, 1934, 1 specimen. 

 275-34. Tenacatita Bay, Mex., 25-35 fms., March 4, 1934, 1 specimen, 

 type. 



Remarks. — The type measures about 2 cm. with the oral end ex- 

 panded. Several tentacles are torn off, and most of the inner organs 

 are ejected. 



The spicules resemble closely those found in T. pseudofusus Deich- 

 mann (1930, p. 168) from Yucatan, 25 fms. depth. The spicules differ 

 in various respects; the West Indian form has tables with a short robust 

 spire with numerous teeth and lacks apparently the numerous perforated 

 plates in the tentacles. 



4. Thyone strangeri, new species 

 Plate 19, Figs. 1-11 



Diagnosis. — Medium-sized form; numerous delicate feet scattered 

 all over the body wall, often with conical or wartlike base. Calcareous 

 ring with long posterior prolongations; interradials broad, more or less 

 heart shaped, united by sutures with the radials. Stone canal small with 

 a small head with thickened edges coiled up like a ball ; Polian vesicle 

 single. 



Spicules a crowded layer of oblong tables, often with thickened edge 

 and a varying number of knobs; number of holes in disk variable; spire 

 small, on the verge of being reduced ; teeth almost completely lacking on 



^S9-.^ 



