16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



(fig. 5b) . Ventral tube feet with well-developed end plate and curved, 

 perforated supporting rods and plates of average length 0.14 mm ffig. 

 5g). 



HoLOTYPE. — Complete specimen, total length 10.5 mm, greatest 

 breadth 4.5 mm, height 3.0 mm. Located in the collection of the 

 Allan Hancock Foundation, Los Angeles, AHF no. 325.1. 



Type-locality. — Velero Sta. 1660-48, southwest shore of Smug- 

 gler's Cove,^Santa'Cruz Island, [Calif., shore,^collected Dec. 29,1948. 



Remarks. — It is a pleasure to name this species in honor of 

 Dr. Elisabeth Deichmann of the Museum of Comparative Zoology, 

 Harvard University. This species is unique in possessing large sole 

 deposits that tend to become multilayered, and it is thus readily 

 distinguishable from other Lissothuria species. Although L. nutriens 

 (Clark) is known to occur in the area where this new species was 

 collected, it is not likely that L. deichmannae is merely a variant of 

 L. nutriens, for the sole deposits of the two species are completely 

 different. 



Lissothuria veleronis (Deiclunann) 



Thyonepsolus veleronis Deichmann, 1941, p. 140, pi. 26 (figs. 6-8), pi. 27 (figs. 8-9). 



Diagnosis. — Dorsal scale covering complete. Deposits of dorsal 

 surface are hourglass-shaped deposits resembling cups; no towers. 

 Deposits of sole are knobbed plates. Tentacles lack rosettes. 



Remarks. — This species has not been found since Deichmann 

 (1941, p. 140) described the single specimen collected from Tagus 

 Cove, Albemarle Island, Galapagos Islands. It may be distinguished 

 readily from other Eastern Pacific species since no towers occur among 

 the dorsal deposits. Deichmann (1941, p. 140) suggests that perhaps 

 the lack of towers is accidental. If this is so, then the characteristic 

 knobbed plates of the sole serve to distinguish this species from others 

 in the genus. 



Lissothuria hancocki (Deichmann) 



Thyonepsolus hancocki Deichmann, 1941, p. 140, pi. 27 (figs. 1-7). 



DiAGNOSis.^ — ^Dorsal scale covering complete. Deposits of dorsal 

 surface are hourglass-shaped deposits and towers. Deposits of sole 

 are knobbed plates. Tentacles lack rosettes. 



Remarks. — As with the above species, no further material of L. 

 hancocki has been reported in the literature. Deichmann (1941, 

 p. 141) described this species on the basis of a series of 49 specimens 

 collected in the Gulf of California and off the coast of Ecuador in 

 depths of 5-165 fathoms. 



