508 ME. E. I. POCOCK OK THE 



i?ii?iiatij)Us,"KaTsch. Moreover, it seems probable that Spiro- 

 holus caudatus of Newport and lulus {Paraiulus) rasilis of Karscb 

 are intended to be included, the letter " N " with which they are 

 marked being, I suppose, a misprint for " W," whieb was Boll- 

 man's symbol for " W. Indian." I presume that Mr. Bollman 

 saw specimens of lulidcB ticketed " W. Indies," whicb be referred 

 to the above species. But since I am not prepared to accept, 

 witbout further information, either the localities or the identifi- 

 cation of the specimens, I have thought it superfluous to include 

 in this report further references to these species or notes upon 

 their characters and aflSnities. 



Suborder Poltdesmoidea. 



Eamily Poltdesmid^. 



The genera of the family here recognized maybe distinguished 

 as follows : — 



G. The third segment like the second segment 

 of a Glomeris, with its lateral portion 

 enlarged, very much larger than lateral 



portion of the second and of the segments [Sauss. 



that follow it ; all the keels vertical .... CyclodesmuSj Huinb. & 

 h. The third segment not larger than the rest 

 and resembling them in structure; the 

 keels not vertical. 

 a}. Pores invisible; keels depressed, the 

 head concealed beneath an expansion 



of the first segment Cryptodesmus, Pet. 



6\ Pores visible on their appropriate seg- 

 ments ; the head not concealed. 

 G^. Pores dorsal, situated in the centre of 

 a perfectly circular smooth plate ; 



caudal process wide, squared .... Platyrhachus, Koch. 

 &". The pores lateral, not surrounded by 

 a smooth circular area; caudal process 

 triangular, posteriorly narrowed with 

 truncate apex. 

 a^. Keels of the 2nd segment rising 

 below the level of those of the 1st 

 and 3rd segments Strongylosoma *, Br. 



* Syn. Paradesmus, Sauss. 



