NO. 3 DEICHMANN : HOLOTHURIOIDEA ; PART I, DENDROCHIROTA 1 1 7 



have a well-developed complex spire, although rarely as large as in 

 lugubris. Introvert w^ith large tables with numerous holes and reduced 

 spire. Tentacles exclusively with delicate rods or plates perforated by a 

 large number of holes. Color mostly mottled brown, sometimes almost 

 black ; occasionally a pale faded specimen may be encountered in the pre- 

 served material. 



Type. — Holotype, AHF no. 34. 



Type locality. — Station 744-37, near Point Piaxtla, Sinaloa, Mex., 

 Gulf of Calif., April 1, 1937, 6-8 fms. 



Distribution. — From the upper end of the Gulf of Calif, to the Gala- 

 pagos. 



Depth. — From 6-25 fms. 



Specimens exarnined. — The type and paratypes and a number of indi- 

 viduals secured at the following Velero stations: 



145-34. North end of Albemarle Island, 6-7 fms., January 12, 1934, 

 1 specimen. 



00 







06 

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I I I I I I M I I I I I I I I I I I I I 



Text fig. 6. Pachythyone lugubris (Deichmann). 



1-2. Plate from tentacle and table from introvert. 

 Pachythyone pseudolugubris, new species. 

 3-4. Plate from tentacle and table from introvert. 

 Scale, ^00 mm. 



