HEMICHORDATA 



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 ; Schizocardium is recorded from 



FIG. 1. Forms of Balanoglossus. A, Balanoglossus clavigerus, Eschsch. , Naples, x \ ; 

 B, Glandiceps hacksi, Mar. (incomplete), Japan, x 1 ; C, Schizocardium brasiliense, 

 Speng., Rio de Janeiro, x 1 ; D, Dolichoglossus koivalevskii, A.Ag., Chesapeake 

 Bay, x 1. a, Anus ; ab, abdominal and caudal regions ; b, branchial region ; c, collar ; 

 g, genital region ; g.p, gill- pore ; g.w, genital wing ; h, hepatic region ; m, position 

 of mouth ; p, proboscis ; t, 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 kowalevskii 

 (Fig. 1, D), according to Bateson, 1 lives between tide-marks at a 



1 Quart. J. Micr. Sci. xxiv. 1884, p. 209. 



