37 10 Proceedings of the Royal Irish Academy. 



the adult will have the rods in the pharynx relatively longer, and the claws 

 more decidedly of the Diphaseon type. 



Habitat. — Among moss from the margin of a tarn on Shevemore, Achill 

 Island, at an elevation of about 1,000 feet : only a few examples. 



Macrobiotus papillifer Murray. (Plate II., figs. 10a-10c.) 



Variety. — Papillae in number and position as in the type, but arising from 

 large hemispherical or conical bases. There are six papillae in a transverse 

 row on each segment and pseudo-segment : and they cover the whole surface 

 of the segments, touching at their bases. The last three apparent segments 

 have only four papillae on each. There is a large papilla at the base of each 

 fourth leg. Pharynx with three short rods, and no comma. Claws unequal, 

 united near the base only, diverging at about a right angle. Length 200 fi. 



The large size of the dorsal and lateral processes, which occupy the whole 

 surface, gives the animal an appearance very different from that of the type ; 

 and it may prove to be a distinct species. It agrees in pharynx and claws. 



The variety has been seen in Scotland, but never recorded. 



Hahitat. — Salt-marsh, Clare Island ; among Sphagnum, Blantyre Moor, 

 Scotland. 



Macrobiotus ornatus Bichters. 



All the three forms described by Bichters (spinifer, spinosissivius, and 

 verrucosus) occurred in Ireland. 



Var. verrucosus. (Plate II., fig. 12a to 12c.) As Professor Bichters 

 identified my first drawing of M. scabrosm as this variety, it is here figured 

 and described in order to point out the differences. Var. verrucosus is exactly 

 like the other varieties of 21. omatus, except that the spines are greatly 

 reduced or lacking. All these varieties are smaller than M. scabrosus ; the 

 papillae are in regular rows across the segments ; there are no eyes ; and the 

 claws are Y's with short stem, rather than Vs. The spines of the spiny 

 varieties spring from the transverse ridges, and in the var. verrvxosus these 

 ridges are still represented by lines. 



Macrobiotus scabrosus sp. n. (Plate II., figs. 11a, 11b.) 



Specific characters. — Small, papillose ; papillae unequal and irregular ; 

 gullet narrow, pharynx with two short rods ; dark eyes ; claws V-shaped, 

 united at base only, pairs equal, claws of each pair unequaL 



Length about 250 /i. The slender gullet ends with conspicuous apophyses, 

 and the two rods of the pharynx are little longer than broad. There is no 



