Zoogeographical Investigations in Southern Greenland. 267 
of a supra-ocular spine, and by its inferior size (7 m.m as against 10 mm.). 
The telson exactly resembles that of the form mentioned. 
Spirontocaris polaris juv. (Fig. 16). 
Bredefjord St. 32, 35—37 m. (16/vm), 1 spec.; St. 48, (19/viz), 
2 spec.; St. 60, 500 m. w. (22/vir), 1 spec.; St. 61, 12,5—13 m. (22/v1z), 
about 50 spec.; St. 64, 
600 m. w. (23/vir), 1 spec. ; SD, 
St. 66, 9—11 m. (23/vrn), AD 
15 cem.; St. 79, 30—50m. SS ; 
(27/vit), 3 spec.; St. 89, a 
16—17 m. (31/vir), about 
30 spec.; St. 104, 7—20m. 
(5/vu1), about 15 spec. — 
Bredefjord Sermilik 
St. 118, 500m. w. (10/vm1), 
1spec.; St.119, 400 m. w. 
(10/virt), 2 spec. 
I have already, in 
Danmark Exped., p.518— 
22, Pl. 40—42, described 
two young stages of Spi- 
rontocaris; I now consider 
it certain that both are 
Sp. polaris, the form de- 
seribed on p. 521, Pl. 42, 
being the younger. The 
whole of their structure 
tends to show that they 
cannot be far from the 
adult stage, both the 
mxp2 and pl—pd for in- ea - 
stance, are of altogether Fig. 16. Spirontocaris polaris juv. 
adult form, and the telson 
has, on its posterior edge (excluding the corners) 4 strong spines, a 
character which is only found in Sp. polaris. 
The “Rink” material includes a large number of specimens from 
the localities mentioned above, corresponding in all essentials to the 
younger of the forms referred to. 
Length in most cases 11 mm., occasionally somewhat less. 
The most striking difference is the presence, in most specimens, 
of 3 small spines between the outermost of the four on the posterior 
edge of the telson and the large corner spine; these are, however, lacking 
im several cases, as in the specimen from the Danmark Exped. There 
are three spines on each of the posterior corners of the telson. 
