318 DAVID BRYCE ON 



Encentrum Murray! sp. nov. (Figs. 1-3). 



When fully extended and straightened, tlie body is moder- 

 ately long and rather slender. It is divided by more or less 

 obvious constrictions into some seven or eight segments. In 

 lateral view the depth of the body is seen to be greater than its 

 thickness. The dorsum is irregularly arched and swollen, but 

 the exact outline is varied continually by incessant and violent 

 contractions, or retractions of head or foot, as the animal sv/ims 

 vigorously about with many turnings and twistings. 



The head is somewhat cylindric in form and has a rather 

 low hood-like expansion on the dorsal front. The anterior 

 portion is usually bent somewhat downwards and the hinder 

 part hidden partly within the overlapping of the following seg- 

 ment, a distinct skinfold coming well forward on the head. The 

 face is normally oblique but varies frequently to an almost prone 

 position. The second and third segments have about the same 

 thickness as the head, but the fourth segment containing the 

 greater part of the stomach is notably arched and has generally 

 behind it a moderate constriction. Then follows a less prominent 

 but also swollen segment covering a large intestine. Behind 

 this is a heavy skinfold crossing the body obliquely (in lateral 

 view) and hiding the anus. 



The foot has two joints, the upper having a very voluminous 

 skin falling over and partly enveloping the lower joint. The 

 latter, when seen fully outstretched (as in fig. 2), appears dis- 

 tinctly slender and tapering until near to the bases of the toes, 

 where the skin seems tightly clinging. The length of this joint 

 -on the ventral side is about twice its depth, and this clearly dis- 

 tinguishes this species from Encentrum permolle and E. ferox. 

 The toes had the remarkable peculiarity that in some examples 

 they were nearly twice as long as in others. All the earliest 

 specimens seen had the long toes, which in one case measured 

 48 fx in length, whilst most of the later had toes of about 25 /x 

 long only, as in the example sketched (fig. 1). The toes were 

 moderately stout and slightly decurved, the ventral edge nearly 

 straight, the dorsal slightly convex, so that the toes tapered 

 gradually from near their bases to the sharp tips. The bases 

 were set close together, and the toes were strongly divergent. 



The trophi (fig. 3) are of much the same type as those of 



