EURETE SPINOSUM. 135 
as distinct subspecies. To me it seems that a subdivision of the species into four 
local forms (A, B, C, and D) adapted to different surroundings, but congenitally 
hardly at all different, would more correctly express the relation between them. 
Their distinctive features are the following: — 
Eurete erectum A. (Murete erectum F. E. Scuuuze, 1899). 
Main-tube dichotomous. One kind of scopule with 4-6 end-rays with 
terminal tyle. Total length of scopules 400-600 x. 
Eurete erectum B. (Hurete erectum subsp. tubuliferum Wiison, 1904). 
Main-tube simple. Several kinds of scopules with 3-10 end-rays, all with 
terminal tyle. Total maximum length of scopules 400 ». Distal ray of dermal 
pinules under 40 u thick. 
Eurete erectum C. (Hurete erectum subsp. gracile WiLson, 1904). 
Main-tube simple. Several kinds of scopules with 3-6 end-rays. These 
in some with terminal tyle, in others distally attenuated and without tyle. 
Total length of longest gastral scopules 1.5 mm. Distal ray of dermal pinules 
50 va thick. 
Eurete erectum D. 
Main-tube simple. Several kinds of scopules. Some small dermal ones 
with only 2 end-rays without terminal tyle. The others with 3-6 end-rays. 
These either distally thickened and with terminal tyle or, more rarely, cylindrical 
or attenuated distally, without terminal tyle. Total length of largest gastral 
scopules 1.18 mm. 
Eurete spinosum, sp. nov. 
Plate 29, figs. 1-26. 
One fragmentary specimen of this species was trawled off northern Peru, 
west southwest of Aguja Point, at Station 4656 on 13 November, 1904; 6° 54.6’ 
S., 83° 34.3’ W.; depth 4062 m. (2222 f.); it grew on fine, green mud mixed with 
gray ooze; the bottom-temperature was 35.2°. 
The lateral rays of its superficial pentactines bear exceedingly large spines. 
To this the name refers. 
Shape and size. The single specimen is a lamellar fragment 25 mm. long, 
20 mm. broad, and 2 mm. thick. It is curved in one direction, the radius of 
