Messrs. Ilnnoock & ITowse on Jaiiassa bitumiuosa. 47 



first three and most constiuit segments of the head representetl 

 by tlieir apjH'ndages, though these are diminished to a very 

 minute size, so as not, in /'. ortha</orisci\ to be visible to the 

 unassisted vision. As we also tind tour out ot" the tive pairs 

 of tlioraeie api)en(hii:;es present, it is pretty phiin that it is 

 ehietly the ordinary oral appoiulai::es, or rather those appen- 

 dajxes usually nuHlitied for the purpose o( assisting in the pre- 

 hension and niastieation of food, that beeome altereil into the 

 strange-looking arboreseent follieles met with around the 

 mouth. 



ILXrLANATlON OF TLATK 1. 



Fiij. I. Pt'iuullii orthtu/orisci, 9. luitunil sizo. (Tho spooiiiioii has shnmk, 



i'lvm boiujr pivsorvod in spiritji. ) 



Mff. 2. Elojul. oiihirjroil, iltn-siil aspoot. 



Fit/. 3. Tho i^imo, voiitnil aspoot. 



Fi(/. 4. Kvo-spot {(t), antonmilos {b), nnteniuv (c). 



/Y</. 5. Anal oritioo. 



/■ty. 0. Head of socoikI spocimou, showing tlio ooiupjvrrttivoly short horns. 



\lll. — ()« Janassa bituiniiuv-^a, SvhfoffietiHy fratn the Marl- 

 Slate of Mi(f(hri<f,/c, Dt/r/niin. \W Al.r.VNV ll.VMOCK, 

 F.h.S., and KiriiAKP llowsi:. 



[Plates II. & III.] 



TnROl'OiH the obliging kindness of Joseph DutV, Kscp, who 

 has boon for many years aotivoly invostigating the fossil th>ra 

 and fauna of tho south of Durham, wo have lately had an 

 opportunity of thoroughly examining the strueture of the jaw- 

 teeth and shagreen skin of this most interesting addition to the 

 fauna of the Knglish ^larl-slato, whieh is the exaet eipiivalont 

 of the Ciorman Ivupforsohiofor. 



Four groups of those romarkablo jaw-tooth liavo boon ob- 

 tained by Mr. Ihiif at Midiloriilgo — tlio iirst group in tho year 

 1S(),"), and tho others during tho autumn of tho prosoiit voar, 

 18G0. These are, wo believe, the first and only spooimons 

 that have been disoovored in England. 



Hut in Gernniny tiiis species has been fiO(piontly found in 

 the Ivupforsohiofor, whioli is very muoh wm-kod, on aoooimt of 

 the valuable ooppor-pyritos wliioh it eontains, in numorous 

 looalitios ; and oonsoipuMitly the general appoaraiioe of those 

 tooth nnist be well kiunvn \o those who are tamiliar with the 

 works of Sohlothoim, Miinstor, (leinitz, and others. Aceord- 

 ing to the last-named author, the beautiful spoeimen still 



