Pnoc. Zo«L. Soc.— 1901, Vol. II.j 



iTofm-i 11. 101. 











Foaition of 

 cerebral 



., , Position of 

 .Number i3tblind- 





Number 



Kelatire , 

 lengths of 

 stylet (S) 



and its . 

 base(B). 















or^n 



relflUve to 



bmin. 



"'V'^ gnt pockets 

 l"*™- relaUreto 

 nerves. , (jrajp^ 



Eyes. 



of reserve 

 stylet- 

 pockets. 



Pecnliar features. 















SIcI. 



















/ //. puIcAfT 



Behind. 



14 1 Not to br. 



■ P. 



Many. 



2 



S>B 

 Mel. 



0. 

















A. /aciijtoreus 



In front. 



U 1 To br. 



Many. 



2 



S=B 



Many excretory ducts. 













P 



P.; p. 



P. 



P. 



P. 



P. 









I. Arctic 

 Circuiiipolnr. 



A. nrciicuB 



In front. 



10 



Not to br. 



Many. 



? 



? 



(Esophagus with dorsal and 

 ventral unpaire<l diverticula. 



















P. 



p. 



P. 



P. 



P. 



P. 



P. 











//. fhompsoni 



In front. 



10-18 



Not to br. 



Many. 



2 



S>B 



Vnsenhu* network in o:?sopha- 

























geal region. 











' A. puhhi-T 







(See 



above) 

















A. marmorafits ... 



licsidc. 



10 



Not to br. 



JIany. 



2 



S=B 



a. 



(Esoplnigns with dorsJil and 

 ventral impaired diverticula. 











A. lactijlorcus ... 







(See 



above) 





McI. 













A. hioculeUus 



? 



? 



? 



2 



2 



Mol. 











II. Atlnntic 











Mol. 



Mel. 



O. 







i 





A. hastaius 



? 



? 



? 



Many. 



•1 



S=| 



Uoplialio vascular lacuuiu in- 

 stead of loop. 













t^ 







R. 







R. 















A. dissimiilam ... 



In front. 







Many. 













p 







M. 



M. 



M. 



M. 



M. 



M. 









o 





A. firccnnmni 



Beside. 



U 



To brain. 



Few. 



2 



S=B 









-»1 







M. 



M. 



M. 



M. 



M. 



M. 









-^ 





L A. f/hifi)io.vis 



Beside. 



11 



To brain. 



Fe-,v. 



2 



S>B 















P. 



P. 



P. 



P. 



P. 



P. 



P. 











A. iKudhucs 



In front. 



15 



Not to br. 



Many. 



2 



S = B 



Kead-glands reach to intes- 

 tine. 













C, 



C. 



C. 



0. 



C. 



C. 



0. 











A. aiujidotus 



In front. 



17-20 



To brain, 



Many. 



2 



S = B 



Occasionally more than one 

 pair of excretory ducts. 













C. 



C. 



C. 



0. 



0. 



C. 













A. himarulaius ... 



Beside. 



Hi 



To brain. 



Many. 



4 



S = 2B 











III. Pnciflc 





0. 





C. 



0. 



0. 



C. 











boroiil. 



A.li</rmu.. 



In front. 



? 



Not to br. 



Many. 



2 















C. 



c. 



C. 



0. 



C. 



" C. 



0. 











yi. '/n-bulosus 



In front. 



17 



To brain. 



Many. 



2 



S = B 



Lateral glands in oesopliagcal 













C. 





C. 



0. 



C. 



C. 



C. 











A. Icuciodus 



In fj-ont. 



? 



To brain. 



Many. 



3 



S<:B 



Many excretory ducts. 













C. 





C. 



0. 



0. 



0. 



C. 











A.crUi^ 



In front. 



? 



To brain. 



Many. 



G-l-J 



S<B 



Many excretory ducts opening 























dorsally. 









I. Iiulo-Pucine. 



A. anihohicitiiU ... 

 ' A. puldwr 



Beside. 



? 



Not to br. 

 (See 



? 

 above) 



y 



? 



Diagonal nuiscle-laycr. 



10 proboscis-nerves. S=B. 



Opening of cerebral oi'gan in 











A. rcticulnfiis 



Boiiind. 



i'o 



? 



Many. 



2 



S=B 

























front of brain. 











A. fflaiidulo.-iics ... 

 A, sttiHuittsi 



Behind. 

 Behind. 



? 



14- 



To brain. 

 Jiot— to-br.— 



12 



2 



S=B 

 ? 









— g — 











(See 



above) ' 

















A, vivfifttus 



Beside. 



14 



Not to br. 



Many. 





S = B 









s 



M 





A. diibhis 



In front. 



? 



To brain. 



2 



S<B 



Cerebral organ far in front of 

 brain. 







II. West Arvicau. 



A. ahjcnsis 



In front. 



? 



? 



Many. 

 Many. 





s=? 







1 



(Mcditcn'iinoun.) 



A. oltaaounnatits . 

 A. poli/ommttttts... 



In iront. 





Over br. 



2 



?" 









s 





In front. 



■/ 



To brain. 



Many. 



2 



? 









g 





A. hctijloreiis 







(See 



above) 













6 





A. cariiicUoidcs ... 



In front. 



i'i 



To brain. 



None. 



2 



? 



Well developed subepithelial 







M 



















glands in front of brain. 









A. langUcgemimis . 



In front. 



12 



Not to br. 



None. 



2 



S=J 













A. validissimvs ... 



In front. 



? 



To brain. 



Many. 



3 



S = B 













A. /msfatits 



A. pui/na.v 







(See 



above) 

















? 





y 







? 











(G«me>,.) 



A. duhitts 



A. spitiostis 



In front. 



18 



(tec 

 Not to br. 



above) 

 None. 



8 



S-=rB 









B g 









o g 3 





A. spimtsissimus . 



In front. 



16 



Not to br. 



None. 



11-12 



S<;B 









4« 





A. crm-iittus 



In front. 



IG 



Not to br. 



None. 



3 



? 







Tlio letters occurring in the table above each statement denote the authors on whoso authority the facts are given. 0. = Coe, 

 J.=Joubin, M.=Montgomery, MeI.=MeIntosh, 0. = Oudemans, P. = Punnett, R. = Riche3. Where no letter occurs the state- 

 ment concerned is due to Biirger. The following species have been made by Verrill (Trans. Connecticut Acad. 1892) on 

 external features alone— -J. mullisoriis, heterosoriis, te/rasuriis, ochraceus, frontalis, mesorus, crucntatus, at/ilis. 



Hubreelit also (' Challenger ' Reports, vol. is.) has described two additional species, A. marioni and A. 7mselei/i, but the 

 n>orphological details given are insufficient to make it worth while tabulating them. 



