r912.] R.B.SEyMOUR-SEWELL: Surface-Living Copepoda. 372 
P. danae, A. Scott, The Copepoda of the Siboga Expedition, 
Pt. tps, 250: 
A few specimens were obtained in locality Q. 
These all agreed exactly with the description given by Thomp- 
son and Scott of the variety found by them round Ceylon. 
A. Scott also describes a form of P. danae found by him in 
the ‘‘Siboga” collection, in which the 5th pair of legs are the 
same as in var. ceylonica, but the furca agrees with Giesbrecht’s 
original specimens. ‘This form is of interest in supplying the inter- 
mediate stage of variation. 
3. Pontella investigatoris, sp. nov. 
Pl. xxiii, figs. 1—3. 
Three males were obtained in localities A and E. 
These specimens appear to differ from any previously des- 
cribed species. No corresponding females were found. 
@ Total length 2°9 mm. 
The cephalo-thorax is robust; the head is furnished with 
side hooks and terminates anteriorly in a well-developed rostrum, 
provided with well-marked rostral lenses; there is also a well- 
developed ventral lens. The 4th and 5th thoracic segments are 
separate and the latter terminates laterally in a triangular plate, 
which is slightly asymmetrical, being more sharply pointed on the 
right side. 
The abdomen is contained 33 times in the length of the 
cephalo-thorax, it consists of 5 segments, of which the relative 
lengths are 7:4:6:2:4. The furcal rami are slightly asymmetri- 
cal, the right being a little stouter than the left; they are 23 
times as long as broad and are equal in length to the preceding three 
segments, The 2nd furcal seta is about twice the length of the 
others. 
The Ist antennae are as usual asymmetrical and the relative 
proportions of the joints of the left antenna are as follows :— 
Ree ee Ae Oe ONO) LOR To el Aw Gore Low lat Lor LO On cite 2 2a 23s 24a 
GOs 38h es Go ey 14; WO, CL ih yues HO, Won geome th Fa eee eh Sh Hen PO 2G Ec 
The roth and 11th joints are partially fused together. 
In the right grasping antenna the middle joints are much 
swollen. The proximal segment of the knee-joint bears on its 
upper margin a toothed-plate somewhat longer than the joint 
itself, and produced proximally over the preceding segment, and 
bears a series of sharply-pointed teeth that diminish in size distally. 
The distal segment bears two toothed-plates, each armed with 
aseries of fine needle-shaped teeth, and has a sharp spine at its 
distal extremity. The proportional lengths of the three terminal 
jOIMts are 2 Se2-23. 
In the 5th pair of legs that of the right side somewhat 
resembles P. atlantica (M.E..); the proximal segment of the claw 
