2 ]\Ir. A. W. Waters on some 



were described in such a way that we have had no idea as to 

 the species intended, for the characters used were not those 

 wliicli we now know are of most importance. 



Ahliough my examination was but a very hurried one, it was 

 possible to recognizemanyspecieswhich havesince d^Orbigny^s 

 time been more fully described ; in others the affinities only 

 could be indicated, for it is often only possible to make a 

 determination after jnolonged examination and preparation of 

 opercula and other structures, besides reference to the literature. 

 Some of the most important books were at my side during 

 the examination, but it was not possible to have all available 

 as if I had worked in my ow^n study. In some cases nothing 

 more could be said than that the determination of some un- 

 satisfactory specimens is impossible; but even this may save 

 other people time and prevent their trying to make imprac- 

 ticable comparisons and determinations. 



Naturally our knowledge of the geographical distribution 

 is increased in many cases, and some of the ' Challenger ' 

 species had been previously seen by d'Orbigny, as : — 



Thalamopoj-ella labiata, Busk. 

 Adeonella polymorpha, Busk. 

 Lepralia jajionica, Busk. 



Saswellia aunculata, Busk. 

 Adeonella ^.^/ftifl/ea, Busk. 



It has seemed advisable to refer to the species in the order 

 in which they occur in the ' Paldontologie Franqaise,^ giving 

 the page and plates, when figured, tjien the reference to 

 'Voyage dans PAmerique Mdridionale ' is added, as well as 

 to my memoir of the Bryozoa from the Antarctic collected by 

 the * Belgica/ and to a paper of mine on Bryozoa from Cape 

 Horn now in the printer's hands. It may be taken that, with 

 few exceptions, the names in the collection are those given in 

 the '■ Paleontologie Fran9aise,^ but a few species have the 

 names given in the ' Voyage,' and some others the con- 

 venient name Cellepora ; but it has not been necessary to 

 refer to these exceptions. 



It will be understood that only a part of the recent 

 Bryozoa described by d'Orbigny are here mentioned and that 

 the ])aper is worked up from rough notes made during a short 

 visit. Fig. 1 (PI. I.) is drawn from the actual specimeiij 

 but the other figures are drawn from rough sketches and 

 must be considered to a large extent diagrammatic. 



