104 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



margin distinctly thickened ; spire in most cases low, in process 

 of becoming vestigial; supporting tables with an enormous 

 conical spire 4. Thyone strangeri, new species 



2. Disk of tables small, oval or squarish in outline, with 4-8 

 holes, in some cases the disk is lozenge shaped with a few small 

 holes in the ends; no knobs 3 



3. Disk oval or lozenge shaped ; spire moderately well developed, 

 mostly with few, indistinct teeth. Supporting tables with 2 

 pillars which unite into a tapering cone ending in 2 small di- 

 verging teeth (often broken off) 



2. Thyone bidentata, new species 



3. Disk oval with 4 central holes and a "handle" on the inner 

 side ; spire tapering with 3-4 small teeth at the top ; support- 

 ing tables with 2-3 pillars in the spire which ends in 2-3 teeth. 

 3. Thyone parafusus, new species 



1. Thyone neofusus, new species 

 Plate 18, Figs. 1-6 



Diagnosis. — Small form (few cm. long?) ; feet delicate in 5 indis- 

 tinct bands and scattered in the interambulacra. Calcareous ring typical; 

 single small stone canal and single ventral Polian vesicle. 



Spicules delicate tables with 4-8 holes and 2-pillared spire. Feet with 

 large end plate and numerous curved supporting plates or rods with 4 

 central holes and a varying number in the expanded ends and no trace 

 of a spire. Introvert with rosettes; tentacles with delicate rods and ro- 

 settes. Color of the preserved specimens white. 



Type. — Holotype, AHF no. 30, 2 paratypes. 



Type locality.— Station 190-34, Lat. 0° 55' S.; Long. 90° 30' W.; 

 58-60 fms. 



Distribution. — Off the Galapagos and vicinity. 



Depth.— From 20-60 fms. 



Specimens exarnined. — The type and the following specimen from the 



Velero Expeditions: 



190-34. Lat. 0° 55' S.; Long. 90° 30' W.; 58-60 fms., January 26, 



1934, 1 specimen, type. 

 814-38. North of Hood Island, Galapagos, 20-40 fms., January 28, 

 1938, 2 specimens. 

 Remarks. — The type measures about 2 cm. with the tentacles with- 

 drawn. The gonads form 2 well-developed tufts ; so the animal may pos- 



