266 
ring, somewhat prolonged backwards on the dorsal side, otherwise 
presenting no peculiar features. — There is no thick skin eovering 
the plating of disk and arms. 
It should be pointed out that even at the point of the arm no 
primary dorsal or ventral plate can be distinguished. A consider- 
—6. Astrocharis gracilis 
Fig 
3. View of interra ER edge or mi disk, with the genital slits. ig — 0 Part of the 
distal Kal of the 1 side view, showing the two armspines. %/1. — 5. From one 
of the last slergesig ile 6th from the point), showing the armspine ae 
into a hoo is articulated to the plute ove W hore are seen numerous smal 
plates of ibe dorsal side in various stages of development. !W/, — 6. The type- 
specimen in natural size; on the larger arm to the left is seen the gall. !/. 
able number of small plates appear contemporaneously, irregularly 
distributed. Only the side arm plates are distinct on the youns 
joints in the outer part of the arm (Fig. 5). They nearly join in 
the median line on the ventral side, but do not widen towards the 
dorsal side of the arm. 
Colour white. The fact that the three arms of the specimen 
are considerably shorter than the three others evidently indicatesS 
that this species divides by autotomy, as appears to be the case 
also in the other species of the genus. 
