140 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



Specimens examined. — From the following stations: 

 261-34. Tangola Tangola, Mexico, 15-20 fms., March 1, 1934, 1 



specimen. 

 283-34. Thurloe Bay, West Coast of L. Calif., 8-10 fms., March 9, 

 1934, 3 specimens. 



3. Thyonepsolus veleronis, new species 



Plate 26, Figs. 6-8 ; Plate 27, Figs. 8-9 



Diagnosis. — Small form (type less than 2 cm. long) ; distinct sole 

 with feet in a double row along the edge and in a scattered row along the 

 midventral ambulacrum; dorsal side with comparatively few large scales 

 and relatively numerous feet ; external layer of spicules well developed. 

 Spicules in sole knobbed plates ; dorsally huge irregular hourglass-shaped 

 bodies, more cup shaped and less lacelike than in the other species. (Tow- 

 ers were not observed in the type.) Dorsal feet apparently without end 

 plate, walls supported by squarish curved plates of the typical structure. 

 Tentacles with heavy plates and rods with small holes; branches with 

 delicate rods or plates ; apparently no rosettes. 



Type. — Holotype, AHF no. 36. 



Type locality. — Station 147-34, Tagus Cove, Albemarle Island, Ga- 

 lapagos, dredging south of Cove, 30 fms., January 13, 1934. 



Distribution. — Type locality. 



Depth. — Dredged from 30 fms. 



Specimens examined. — The type. 



Remarks. — The single individual measures 1.8 cm. in length (some- 

 what distorted). Its exterior and its spicules are very characteristic, and 

 it cannot be confused with any of the other species of Thyonepsolus. The 

 lack of towerlike deposits may be accidental — it is not uncommon in older 

 individuals of Thyonepsolus nutriens. 



It is a question whether this species properly belongs in Thyonepsolus 

 or Psolidium, but the large hourglass-shaped spicules are so much more 

 reminiscent of those characteristic of Thyonepsolus than of the small cups 

 which are found in Psolidium that I have preferred at present, at least, to 

 refer it to the former genus. 



4. Thyonepsolus hancocki, new species 



Plate 27, Figs. 1-7 



Diagnosis.- — Comparatively large form (sole up to 4 cm. long) ; sole 

 sharply set off; feet in a double row along the edge and in a scattered 



