TARDIGRADA: PACIFIC ISLANDS 155 



Genus Macrobiotus, Schultze (42) 



A : SPECIES HAVING KOUGH EGGS 



Macrobiotus intermedium, Plate (23) 



Identified from an egg which contained a well-developed young. The egg had 

 the typical top-shaped processes. It was, however, not spherical but shortly oval, 

 measuring 60 by 50 n over the spines. The pharnyx contained three quadrate 

 nuts in each row, the first apparently united to the gullet, but distinct from the 

 apophysis. 



Another elliptical spiny egg occurred in Hawaii (Plate XIX. Fig. 416). 



Macrobiotus crassidens, Murray (20) 



As the egg was not found there is some little doubt about this record. It is 

 distinguished from the preceding by the greater relative breadth of the nuts in the 

 pharynx, which are even broader than long. 



Macrobiotus oberhduseri, Doyere (2) 



The Hawaiian form of this species was papillose all over, as in Central African 

 examples, but the papillae were smaller. The bands of colour were faint. The 

 pharynx contained two nuts in each row. 



It is likely that this all-papillose species will prove to be distinct from Doyere's 

 type. The eggs of the various forms of this species are not yet sufficiently known. 



Macrobiotus occidentals (?), Murray (Plate XIX. Figs. 39a-39c) 



This Macrobiotus, differing in some respects from the type of M. occidentalis, and 

 probably a distinct insular race or species, cannot be assigned its final place till the 

 egg is known. 



Description. Small, hyaline or very pale yellow. Length 300 /*. Skin thin, 

 dotted. In all the examples seen there was never the double skin, enclosing a clear 

 fluid filled with thin hyaline rectangular plates, as in the type. Teeth small, not 

 widely spreading, abruptly bent outwards beyond the middle. Gullet narrow ; 

 pharynx with apophysis and two short rods in each row, the first (next the gullet) 

 more than twice as long as the second, which is shortly oval ; a small comma. Small 

 black eyes. Fat-cells very large, 10 to 15 ^ in diameter, hyaline. 



A large (old) example measured 450 /j. in length, and was pigmented like 

 M. hufelandii. The claws are slender, and united less than half-way. 



The points of difference from the type are : the smaller size, lack of colour in the 

 fat-cells, lack of double skin, abruptlybent teeth, and comma in the pharynx. These 

 are points of unequal value, in the aggregate of considerable importance. The pale 



