XIX SYSTEMATIC 487. 
M. tuberculatus, Plate; IM. sattleri, Richters ; IL. papillifer, Murray: 
M. coronifer, Richters ; MZ crenulatus, Richters; M. harmsworthi, 
Murray; JL orcadensis, Murray; I. islandicus, Richters ; JL. dispar, 
Murray ; JL ambiguus, Murray ; I pullari, Murray ; MW. hastatus, 
Murray; JZ dubius, Murray; JL. echinogenitus, Richters ; IL. ornatus, 
Richters ; J. macronyx ? Doy. 
4. Genus DOYERIA-——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 
simplex, Plate, resembles Macrobiotus, and is usually to be found 
in consort with JZ hufelandi, C. Sch. 
5. Genus DIPHASCON resembles JI. oberhduseri, Doy., but 
an oesophagus separates the mouth-tube from the sucking pharynx, 
and the oral armature is weak. The following species are 
British, the first named being very cosmopohtan, being found 
at both Poles, in Chili, Europe, and Asia: D. chilenense, Plate ; 
D. scoticum, Murray; D. bullatum, Murray; D. angustatum, 
Murray; D. oculatum, Murray, D. alpinum, Murray ; D. spitz- 
bergense, Murray. 
6. Genus MJZLNEHSIUM 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, 
M. tardigradum, Doy., British, and IZ. alpigenum, Ehrb. Bruce 
and Richters consider that these two species are identical. 
