ANTARCTIC MARINE 



KEY BASS!) OH CHARACTERS NOT EMPHASISED ELSEKHEf 



25 New Species and 

 2 New Genera 



-f- Terschellingia polaris 5 



meridiana 14 

 edentata 16 



Austronema spirurun 8 



. -n- Monhystera 

 .-F. -f Monhystera 



pilosa 

 unifonais 



frigida 



TAIL CONOID, THEN CYLINDROID,AT LEAST IN FEMALES 

 Posterior(cardiac)oesophageal bulb present 

 "Bulb oblate :... 



Bulb pyrifora 

 Musculature of bulb broken into 2 parts ; 



striae resolvable into elongate markings 



Wings (interrupted striae) inconspicuous 'f Chronadora 



Wings pronounced -n 'f Spilophora 



Musculature of bulb unbroken; striae resolve 

 into dotlike markings, at least on head 



Striae difficult of resolution Spira septentrionalis 1 



Striae easy to resolve 

 Cardiac bulb three-fourths as wide as neck ._-':' Spilophora antarctica 17 



Cardiac bulb one-half as wide as neck _--'f Aplectus antarcticus '3 



Posterior(cardiac)oesophageal bulb none 



Anphids almost invisible transverse slits ::ia subsirailis -2 



Anphids circular, usually 'easy to see 



Pharynx Plectoid, long, resembling oesophagus .. - 



Pharynx short, often small 



Intestinal cells clearly reticulated Sabateria antarctica 4 



Intestinal cells not clearly reticulated 

 Oesoph. trifle larger fn. behind nerveri 

 Oesophagus plain 

 Renette distinctly developed 

 Somatic setae as long as body is wide 

 Somatic setae none or inconspicuous . 

 Renette inconspicuous or none 



Chromatin bodies, 1 in front of each anph'd-n -f Monhystera 

 Chromatin bodies n'r.acphids none or faint 

 Contour crenate.esp. vejitral side of tail ----f Monhystera 



Contour entire -f Monhys. septentrionalis 



TAIL CONOID, NO PART CYLINDROID 

 Po3terior(cardiac)oesophageal bulb present 

 Bulb elongated, not clearly subdivided; renette 



cell probably ellipsoidal -?.--:"- La xus septentrionalis 



Bulb pyriform, musculature broken into unequal 



parts; renette cell elongated 



Contour on ventral side of nale tail serrate .-?. 'f Spilophora 

 Contour entire 



Benette cell 1/^wide as long ;Phar. bulb faint .-71 Chroiadora 

 Renette cell ^ " " " " pronounced-:- 'f 1 Euchr. septentrionalis 19 

 Posterior bulb none!12,13), or a sere swelling 

 Striae of minute BO re or less elongate elenents 



Dorsal tooth with no minute dental opponents .-;?. 'f Euchrorcad. antarctica 20 

 Dorsal " with 1 (22) or 2 (21) Subn. " " 



Tail regular, terminus about Vg wide as base . 'f' Euchronad. denticulata 21 

 Tarl suddenly narrowed on Vent. side n'r.anus -n 'f' Euchrosadora neridiana 

 Striae appear impossible of further resolution 



Lips strong, chi tinous,acute,conoid,eversible . Axonolaimrs polaris 

 Lips not acute, nobile but not eversible 



Cardiac region conspicuously non-staining n-f Monhystera meridiana 



Cardiac region of average nature 



Unicellular lateral glands and pores absent _-j Monnystera antarctica 13 

 Unicellular lateral glands and pores present---'!' Thoracosio-a polare 25 



polaris 10 

 11 



23 



serrata 18 

 polaiis 15 



22 . 



2-1 



12 



