DR. G. S. BRADY ON THE 
long, slender, only moderately curved, and not at all crenulated, the outer blade having 
a markedly constricted median neck ; outer branch of the left foot devoid of marginal 
sete, simple, and terminating in two very small apical sete. Length 1°6 millim. 
Hab. Taken in the surface-net at Port Chalmers and in Otago Harbour. 
This may perhaps be the form referred to by Dr. Kramer as Centropages typicus, 
var. aucklandicus, though in some respects it does not agree accurately with his figures 
and description. It cannot, I think, be properly referred to any variety of C. typicus, 
though the pectinated armature of the male right antennule agrees exactly with that 
species. To make my meaning clearer I give some of the more important characters 
of the two species in a tabular form. 
It is, however, very closely allied to C. brachiatus (Dana), and the females of the two 
species may not be easily distinguishable, but the armature of the antennule, together 
with the structure of the fifth pair of feet in the male, presents very sufficient distinctive 
characters. 
C. typicus. C. discaudatus. 
Basal joints of the antennules...| First, second, and fifth joints in 
both sexes have strong mar- 
No well-developed spines on the 
basal joints in either sex. 
ginal spines. 
15th and 16th joints of the 
right male antennule. 
First abdominal somite in 
female. 
Caudal segments in female...... 
Prehensile branch of right fifth 
foot in male. 
2. CENTROPAGES PECTINATUS, Sp. Noy. 
Sixteenth joint has a strong 
spine." 
Two slender spine-like setz on 
ventral and a shorter one on 
dorsal aspect. 
Twice as long as broad; sete 
not swollen at base. 
Inner claw slightly pectinated ; 
outer not distinctly con- 
stricted in middle. 
A strong spine on both joints. 
One dorsal seta. 
Scarcely longer than broad; 
setz swollen at base. 
Inner claw not pectinated ; 
outer distinctly constricted. 
(Plate LX. figs. 24-27.) 
Female.—Abdomen slender, four-jointed (figs. 26, 27), the first joint wider than 
the rest, bearing on its dorsal surface a brush of several fine hairs and at the posterior 
angle a single slender spine; caudal segments about thrice as long as broad, two or 
three of the principal terminal sete dilated basally (fig. 27 0). Lateral spines of the 
outer branches of the swimming-feet lancet-shaped, with very finely pectinated margins ; 
median joint of the outer branch of the fifth pair (fig. 25) produced internally into a 
1 Giesbrecht figures a rather feeble spine also on the fifteenth joint, but I have not been able to find it in 
any of my specimens. 
