6 HEMICHORDATA CHAP. 
G. abyssicola was found by the “ Challenger” at a depth of 2500 
fathoms, off the West Coast of Africa. Balanoglossus, the largest 
genus now recognised by Spengel, appears to be practically 
world-wide in its distribution; Schizocardiwm is recorded from 
Lv 
Fic. 1.—Forms of Balanoglossus. A, Balanoglossus clavigerus, Eschsch., Naples, x 4; 
B, Glandiceps hacksi, Mar. (incomplete), Japan, x 1; C, Schizocardium brasiliense, 
Speng., Rio de Janeiro, x 1; D, Dolichoglossus kowalevskii, A.Ag., Chesapeake 
Bay, x1. a, Anus ; a, abdominal and caudal regions ; 6, branchial region ; c,collar ; 
g, genital region ; g.p, gill-pore ; g.w, genital wing ; h, hepatic region ; m, position 
of mouth; p, proboscis ; ¢, trunk. (A, B, and C from Spengel ; D from Bateson.) 
both sides of S. America; Glandiceps from the Atlantic, the 
Mediterranean, Japan, and the Indian Ocean; Spengelia from 
the South Pacific; and other species from the White Sea to 
New Zealand. The habitat is usually sand or gravelly sand, 
in which the animal forms a kind of tube by means of the 
abundant mucus secreted by its skin.  Dolichoglossus kowalevskit 
(Fig. 1, D), according to Bateson,’ lives between tide-marks at a 
1 Quart. J. Mier. Sct. xxiv. 1884, p. 209. 
