192 
Occurrence. — Six females and two males were obtained from the plankton collected 
at the following stations. 
Stat. 16, one female and one male. — Stat. 118 (HENSEN vertical net, 900 metres to surface), 
one female. — Stat. 185 (HENSEN vertical net, 1536 metres to surface), two females. — 
Stat. 213, two females and one male. 
This species is so named in compliment to Sir Joun Murray, K.C.B., the well known 
hydrographer, one of the pioneers of oceanic research, whose name is inseparably connected 
with the Scientific Results of the Exploring Voyage of H. M. S. ‘Challenger’, 1873—1876. 
4. Tortanus brevipes nov. sp. Plate LVI, figs. 9—13. 
Female — length 2,3 mm. 
Viewed from above, the body appears elongate ovate, and moderately robust. The 
length is distinctly less than three times the width. The head is separated from the first 
thoracic segment. The fourth and fifth thoracic segments are completely fused together. The 
last thoracic segment is quite asymmetrical. The right side is produced posteriorly into a wing- 
like process that reaches to the middle of the genital segment. The left side is also produced, 
but the prolongation is much shorter, and it is directed at almost right angles to the body 
(Plate LVI, fig. 9). The eye is large and conspicuous. A small triangular spine is visible under 
each eye when the Copepod is viewed from the side. 
The abdomen is composed of two segments. The combined length of the abdomen and 
furca is contained three times in the total length of the cephalothorax, from the frontal margin 
to the base of the genital segment. The genital segment is asymmetrical. Its length exceeds 
the combined length of the anal segment and furcal joints. The anal segment is not separated 
from the furcal joints. It is comparatively short. The furcal joints are slender and of moderate 
length. The joints are twice the length of the anal segment and are asymmetrical. The right 
furcal joint is distinctly shorter and more slender than the left furcal joint. The second inner 
seta on each furcal joint is long and stout. The furcal joints are furnished with one outer 
marginal seta (Plate LVI, fig. 9). 
The antennules are composed of sixteen joints and extend slightly beyond the end of 
the furcal joints. 
The antennae, mandibles, maxillae, maxillipedes and first four pairs of feet are similar 
to those of Zortanus gracilis. 
The fifth pair is very small. Each foot is composed of a single free joint attached 
to a basal part. The free joints are short and broad and slightly asymmetrical (Plate 
ILI, tie, 13). 
Male unknown. 
This species is rather different from the typical members of the genus. It is easily 
recognised by the asymmetrical last thoracic segment, and by the abnormal structure of the fifth 
pair of feet. The apparent abnormality does not arise from any accident to the preparation. 
The peculiar structure of the fifth pair was quite obvious before the dissection was made. 
1g2 
