376 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY 
eiid of a funnel-like structure arising from the posterior dorsal part of 
the thorax and directed backward at a greater or less angle. The 
margin of the orifice is plain or very slightly sinuate. The oral tenta- 
cles are numerous (at least 16, if not considerably more) and are of 
three sizes more or less regularly arranged. Where it was jiossible 
to count them, there were 11 stigmata on a side in the three anterior 
of the four rows, and about nine in the fourth (posterior) row. The 
two or three stigmata in each row which are nearest the endostyle 
become successively shorter as that 
organ is approached. There is a space 
without stigmata along each side of the 
endostyle. The dorsal languets arise 
from the transverse vessels on the left 
side of the body about opposite the 
third stigma from the niedian dorsal 
vessel. The stomach is round and 
the intestine long, forming a wide 
loop. The intestine has one or more 
well marked constrictions. 
In those individuals in which the 
reproductive organs were well devel- 
oped, the testis, though not in all cases 
very well preserved, appeared to be 
always undivided. The sperm duct 
makes from four to six loose coils 
about it. 
The American specimens (of which 
there are over a dozen in the collec- 
tions, all from depths of 100 fathoms 
or over) agree well with Bjerkan's description of the types, which 
were from northwest of Iceland, 590 meters, and east of the Faroe 
Islands, 420 meters. A pair of depressions on the sides of the thorax, 
occupied by test substance filled with small crowded spicules, is pres- 
ent (in many cases, at least), as described by Bjerkan in the European 
specimens. A similar condition occurs in some other members of this 
family, notably in Echinuclinum verrilli of Bermuda and the ^Yest 
Indies, and in Tetradidemnum albidum of our own coasts. 
The majority of the American specimens are from oflf Newfound- 
land and Nova Scotia, from depths of 110 to 300 fathoms. A fine 
Text-fig. 11. 
ensis Bjerkan. 
- Leptoclinides faeru- 
Zooid. X 42. 
