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 



I'IG. 1. — Forms of Balanoglossus. A, Balanoglossus clamgerus, Eschsch., Naples, x J ; 

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

 Speng., Rio de Janeiro, x 1 ; D, DoUchorjlossns koioalevskii, A.Ag., Chesapeake 

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

 y, genital region ; gq}, gill-pore ; i/.w, genital wing ; h, hepatic region ; in, position 

 of mouth ; p, proboscis ; t, trunk. (A, B, and C from Spengel ; D from Bateson. ) 



both sides of S. America ; Glandiceiis 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 koivalevskii 

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



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



