140 J. MURRAY 



second, third, and fourth pairs of legs; teeth slender, curved, gullet narrow, expanded 

 in the pharynx ; pharynx nearly round, containing apophysis, three very broad 

 nuts, and an obscure "comma" in each row. Claws of the hufelandi type, 

 slender, unequal in each pair, and united for half the length of the longer one. 

 Egg small, covered with very slender undulate or curved processes, which spring 

 from small conical bases, and are separated by interspaces greater than their own 

 diameter. 



General description. Considered as one of the smaller Macrobioti, though 

 individuals occasionally attain to a very considerable size. Length of an ordinary 

 example about 300 /u. Only the very large individuals are strongly pigmented ; 

 those of moderate size are generally nearly colourless except in the stomach. The 

 pigment is not in bands. There are usually two small dark eyes, but they are 

 sometimes absent. The nuts in the pharynx are often broader than long. The first 

 appears to be closely united to the gullet, though distinct from the apophysis. The 

 dorsal processes can be seen in the young squeezed out of the ripe egg. 



M. aculeatus is very closely related to M. crassidens, Murray (20), and to 

 M. intermedius, Plate (23). The spines distinguish it from these species. It has no 

 close affinity with M. papillifer, Murray (12), and M. sattleri, Eichters (26), which 

 have somewhat similar spines. They belong to a different section of the genus. 

 The close relationship to M. crassidens is further indicated by the similar egg. 

 They are of almost identical size, but that of M. crassidens, which has been recently 

 discovered in Africa, has spines with larger bases and no spaces between them. 



Habitat. Among moss ; the type with six spines in the Australian Alps near 

 Mount Kosciusko, at an elevation of 5000 to 6000 feet ; a variety with only the last 

 pair of spines (Fig. 27e) at Katoomba in the Blue Mountains of New South Wales. 



Macrobiotus dispar, Murray (16) 



Habitat. Ponds in the Botanic Gardens, Sydney. One of the two aquatic 

 species obtained, the other being M. augusti. 



B: EGGS WITH THICK SHELLS, ENCLOSING EODS 

 Macrobiotus arcticus, Murray? (19) 



Habitat. Katoomba, in the Blue Mountains. 



Without the egg the identification of M. arcticus cannot be absolutely certain, 

 but the animal agreed in all other characters with this species. 



It measured 300 P. in length, the claws were of the Diphascon type, the gullet 

 was slender and expanded in the pharynx, which contained two rods of nearly equal 

 length and about 2|- times as long as broad, and no " comma." 



