SYSTEMATIC 487 



3L tuberculatus, Plate ; 31. sattleri, Eichters ; M.'papiUifer, Murray; 

 M. coronifer, Eichters ; 31. crennlcUvs, Eichters ; 3f. harmsworthi, 

 Murray; 3£. orcadensis, Murray; 3f. islandicus, Eichters ; 31. dispar, 

 Murray ; 3f. anibiguus, Murray ; 31. pullari, Murray ; 3f. hastatvs, 

 Murray; 3L duhius, Murray; 31. echinogenihis,Tdchtei's ; 3'L ornatus, 

 Eichters ; 31. macronyx ? Doy. 



4. Genus DOYEBIA. — The teeth of this genus have no 

 support, and the large salivary glands of the foregoing genus are 

 absent ; in other respects Doyeria, with the single species Doyeria 

 simflex, Plate, resembles 3Iacrohioti's, and is usually to be found 

 in consort with 3f. hufelandi, C. Sch. 



5. Genus DIPHASCON resembles 31. oherhduseri, Doy., but 

 an oesophagus separates the mouth-tube from the sucking pharynx, 

 and the oral armature is weak. The following species are 

 Britisli, the first named being very cosmopolitan, being found 

 at both Poles, in Chili, Europe, and Asia : D. chilenense, I'late ; 

 D. scoticum, Murray ; D. Indlatum, Murray ; D. angustatum, 

 Murray ; D. ocv.latum, Murray ; D. alpinum, Murray ; D. sjntz- 

 hergense, Murray. 



6. Genus 3IILNESIU3f has a soft oral armature, and the 

 teeth open straight into the mouth. A lens can usually be 

 distinguished in the eyes. Two species have been described, 

 31. tardigrad'um, Doy., P>ritish, and 31. alpigemim, Ehrb. Bruce 

 and Eichters consider that these two species are identical. 



