106 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



Type. — Holotype, AHF no. 31. 



Type locality. — Station 275-34, Tenacatita Baj'-, Mex., dredging in 

 25-35 fms., March 4, 1934. 



Distribution. — From Gulf of Calif, to Colombia. 



Depth. — From 12-30 fms. 



Specimens examined. — ^The type and the following specimens from 

 the Velero expeditions: 



245-34. Bahia Honda, Panama, dredging 15-25 fms., February 21, 

 1934, 1 specimen. 



249-34. Bahia Honda, Panama, 15-20 fms., February 22, 1934, 1 speci- 

 men. 



251-34. Secas Islands, Panama, dredging in 15 fms., February 22, 1934, 

 1 specimen. 



275-34. Tenacatita Bay, Mex., off Navidad, 25-35 fms., March 4, 



1934, 3 specimens, type and paratypes. 



423-35. Port Utria, Colombia, close to shore, 20 fms., January 25, 



1935, 1 specimen. 



679-37. Outside of Concepcion Bay, Gulf of Calif., 30 fms., March 



15, 1937, 1 specimen. 

 683-37. Outside of Concepcion Bay, Gulf of Calif., 12 fms., March 



15, 1937, 1 specimen. 

 686-37. Concepcion Bay, Gulf of Calif., 12 fms., March 16, 1937, 1 

 specimen. 



Remarks. — The smallest paratype measures 0.5 cm. in length; the 

 type and other larger specimens measure about 2 cm. In the smallest 

 specimens the spicules are considerably smaller than in the larger as is so 

 often the case, and many of the tables have a squarish disk with 4 acces- 

 sory holes. In some of the larger individuals many tables are lozenge 

 shaped with small accessory holes in the ends, while other individuals 

 of the same size have almost exclusively oval disks with 4 holes. 



The exterior of the animals shows considerable variation in regard 

 to the size of the tube feet, which vary from delicate to fairly stout. 



3. Thyone parafusus, new species 

 Plate 18, Figs. 7-12 



Diagnosis. — Small form (few cm. long) with fairly stout feet, more 

 or less distinctly arranged in bands and scattered in the interambulacra. 

 Inner anatomy typical of the genus. Spicules form a crowded layer of 



