NO. 3 DEICHMANN: HOLOTHURIOIDEA ; PART I, DEXDROCHIROTA 143 



calated between the larger scales 



3. Psolidium ekmani, new species 



2. Dorsal scales smooth, without pearllike projections 3 



3. Dorsal side covered by numerous thimble-shaped grains with 

 flat base (reduced towers). Sole with small flattened cups with 

 lateral spines and a few larger plates with undulated surface 

 or smooth 4. Psolidiuin planum, new species 



3. Dorsal side with no accessory' spicules ( ?). Ventral side with 



heavy knobbed plates and buttons 



2. Psolidium eubullatum, new species 



1. Psolidium dorsipes Ludwig 

 Plate 29, Figs. 1-12 



Psolidium dorsipes Ludwig, 1887, p. 9, pi. 2, fig. 9; 1894, p. 135 

 (passim). — Perrier, 1905, p. 48, pi. 2, figs. 5-15, text figures G-H. 

 — Ekman, 1925, p. 112, text figure 26. 



Diagnosis. — Small form (sole 1 cm. long) ; ventral sole sharply set 

 ofiF with 3 crowded bands of tube feet. Dorsal side covered by imbricating 

 scales, about 10 between oral and anal scales; dorsal feet numerous, often 

 2-3 perforating a single scale; external layer of deposits well developed. 



Spicules in sole plates var^n'ng from smooth to knobbed, 2 types of 

 plates, one with few holes, smooth or with few knobs, one with large holes 

 and numerous pearllike knobs; also an external layer of cups with 4 knobs 

 on the strongly convex side and a marginal brim of delicate teeth. Feet 

 with end plate and oblong supporting plates, slightly curved, often with 

 few knobs. Dorsal side with numerous baskets or cups of same size and 

 tj'pe as in the sole; tube feet mostly with small end plate and walls 

 packed with curved squarish plates, a few may be oblong. In some speci- 

 mens numerous towers are present. 



Type. — Probably in Italy. 



Type locality. — Puntas Arenas, Strait of Magellan, 15-25 fms. 



Distribution. — Strait of Magellan and vicinity. Also Panama and 

 Gulf of Calif. 



Depth. — From 6-60 fms. 



Specimens examined. — The following from the Allan Hancock 

 Expeditions: 



744-37. Near Point Piaxtla, Sinaloa, Gulf of Calif., 6-8 fms., April 1, 

 1937, 4 specimens (poor). 



