88 Papers from the Department of Marine Biology. 
pointing inwards; palp very broad, 2-jointed. Maxilla2 normal. Maxilliped 
inner plate elongate, palp rather long. Gnathopods 1 and 2 similar, nearly 
the same size, subchelate, palm not so long as in Amphilochus, broad, distal 
edge rather oblique, broadest part of palm, finger with sharp spine under apex. 
Perzeopods 1 to 5 slender, 3 to 5 with second joint expanded. Telson com- 
paratively broad with rounded termination. Lateral angles of last abdominal 
segment as long as telson itself. 
Fic. 5.—Cyclotelson purpureum gen. et sp. nov. 
A. Whole animal, lateral view. X17. K. Gnathopod 2. X52. 
B. Antennal. X52. L. Gnathopod 2: finger and anterior edge of palm. 
C. Upper lip. 225. X225. 
D. Lower lip (half). 225. M. Side plate 4 with first joint of perzeopod 2. (Lat- 
E. Mandible. 130. eral plate dotted.) X30. 
F. Maxillal. 130. N. Perropod 4. X30. 
7. Maxilla2. X130. QO. Telson and lateral angles of last abdominal seg- 
H. Maxilliped. 52. ment. 130. 
I. Gnathopod 1. 82. 
Cyclotelson purpureum sp. n. 
Side plates vary in serration of lower and posterior margins: 1 with single 
serration, 2 with about 10, 3 and 4 with many. Antenna 1 six-jointed with 
very few sensory sete, no appreciable difference between male and female. 
Antenna 2 incomplete in specimens examined, but from width of basal joints 
seems to be distinctly larger than 1. Outer lobe of lower lip with fringe si- 
sete and an inwardly directed spine. Mandible with third joint of palp dot > 
tinctly longer than 1 and 2 combined, no sets on palp; three small spinules 
under incisor process. Gnathopods 1 and 2, sixth joint widens gradually of 
form a convex palm with slightly oblique anterior edge; finger stout, equal in 
length to front edge of palm, minute serrations behind subapical spine; fifth 
joint produced to about middle of the palm, process broad; second point pro- 
duced slightly. Telson width more than half length, apex rather rounded. 
Colour, purple on dorsum. Lives on crinoids. Comanthus annulatum, 
Murray Islands, Torres Straits. : 
