Cadulus dichelus. 



C. ovalis nov. spec. 9 1 Metres. 

 *C. priojiofus. 

 *C. minutiis. 



C. hexaschistus nov. spec. 835 Metres. 



C. viagmis nov. .spec. 794 — 1301 Metres. 



C. longilobatus nov. spec. 36 Metres. 

 *'C. simillitnus. 

 *C. euloides. 

 *'C. gadus. 



* Cadïc hts clava tus. 



C. colubridens. 1886 Metres. 



C. virginalis nov. spec. 828 — 1886 Metres. 



C. pseudolivi nov. spec. 1 1 5 8 Metres. 

 *C anguidens. 



C. zonatus nov. spec. 310 — 2796 Metres. 



C. ptilcherrimus nov. spec. 694 Metres. 

 '*C. singaporeiisis. 



C. aórupto-mjïatus nov. spec. 330 Metres. 

 *'C. laevis. 



Of the 59 species already known from our field of exploration 21 have been refound 

 by the Siboga. This proportionally small number is due to the fact that the Siboga collection 

 principally consists of deepsea forms, the greater part of which is new, while the shore forms 

 naturally better known to early investigators are only represented by a few forms. Thus, forms 

 like D. elephantimn)i, formosiou, bisexaiigulatum, octangulatum ^ hexagofiuin and many others 

 evidently of no unfrecjuent occurrence on the shores of the East Indian Archipelago cannot be 

 recorded by the Siboga; on the other hand 40 out of the 58 species obtained by the Siboga 

 are from the deepsea. 



Nearly all the subgenera into which the Genus Dentaliiiin is divided are represented; 

 of two subgenera, untill now only known in fossil state, species have been found. The first is 

 Plagioglypta a very antique group with species principally occurring in the early mesozoic. The 

 second is Gadilina formerly held for one of the .Siphonodentalidae but which is now proved 

 to belong to the Dentalidae and is reported from the Tertiary of North Italy and Java. Some 

 species of other groups also bear a great resemblance to fossil species of the Italian Tertiaries. 

 Thus Entalina quadratigulis Boiss. is nearly allied to Dentalium tetragonum Brocchi, while one 

 species Dentalium Michelottii could be identified with the Italian fossil form. 



Four species must be reported, occurring also in other parts of the earth. The first is 

 Dentalium stenoschizinii P. & .Sh. a coast form of no unfrequent occurrence, reported from 

 the West Indies. 



The second is Dentalium teniiijissnm Mont. also a coast form, reported from the Mediter- 

 ranean. Though it may seem strange that these shallow water forms should be so widely 

 distributed, I do not believe that the case is doubtful. 



The third is Entalina platamodes Watson. This is a deepsea form occurring also in the 

 deepsea of the West Indies, a fact which stands no more alone. The fouith is a variety of 

 Dentalitim entalis L., a species distributed over the northern parts of the eastern and western 

 Atlantic and a frequent shore form but also occurring in great depth. Our variety was dredged 

 at a depth of 4 1 i Metres. 



To my regret I must add a short list of species of which I could not state with certainty, 

 whether they may not be identified with American forms. I have not been in the opportunity 

 of comparing types of those species with the -Siboga specimens and therefore must leave it to 



