All these presented the usual structure which distinguishes tubes formed bj Cerianthids, 

 but it is impossible t" say by wh.it Species the) were formed. lt may, however, be worth 

 mentioning th.it the tube from Station ?, as well as those inhabited by individuals of P. fimóriatui 

 and taken ,a Stations 171 and : 1 ;. contained imbedded in their substance numerous examples 

 of i ■ impare 1 1 w\ 111 1885). 



At Station 95, lat. 5 i;.5-\.; long 119 40' E., Sulu Sea, 52 metres, another empt) 

 tube was obtained, which may be that of .1 Cerianthid, although it is ver) different in structure 

 from those usually formed by these creatures. It is 1 ;, cm. in length, and lias a diameter in its 

 flattened condition i>t' ^.5 cm. The outer surface is transversel) wrinkled, while the inner one 

 is al most smooth; it lias a pale brown <>r hempen colour and is rough and somewhat brittle 

 to the touch. In structure it is composed of a loosely felted mass of fine fibres, among which 

 scattered numerous long monaxial sponge spicules and also some elongated brittle dark- 

 brown setae, whose origin I am not able to determine. The fine fibres which compose the main 

 tissue of the tube resemble nematocyst threads, of which the ordinary tubes are formed, excepl 

 that they are many times thicker than these. It' they are reallj nematocyst threads, it may be 

 expected that the species which inhabits such a tube possesses nematocysts of an exceptional size. 



46 



