74 
THE VOYAGE OF H.M.S. CHALLENGER. 
Measurements. 
In inches and 
decimals. 
In thousandths 
of total length. 
Total length from tip of rostrum to tip of telson on middle line, 
1-27 
Rostrum, ........ 
•08 
62 
Carapace, ........ 
■30 
234 
Carapace including rostrum, ..... 
•38 
296 
From posterior edge of carapace to posterior edge of third thoracic 
somite, ........ 
•05 
39 
From posterior edge of third to posterior edge of fourth thoracic 
somite, ........ 
•06 
47 
From posterior edge of fourth to posterior edge of fifth thoracic 
somite, ........ 
First abdominal somite, ...... 
•08 
62 
TO 
78 
Second abdominal somite, ...... 
•09 
70 
Third abdominal somite, ...... 
•09 
70 
Fourth abdominal somite, ...... 
T2 
93 
Fifth abdominal somite, ...... 
T3 
101 
Sixth abdominal somite, ...... 
•07 
55 
Telson on middle line, ...... 
TO 
78 
Total length of hind body, . ‘ . 
•89 
673 
Total length on middle line, .... 
1-27 
969 
Greatest length of telson, ...... 
•14 
109 
"Width of carapace between antero-lateral angles, 
•18 
140 
Width of carapace (greatest), ...... 
•23 
179 
Width of third thoracic somite, ...... 
•25 
195 
Width of fourth thoracic somite, ..... 
•26 
199 
Width of fifth thoracic somite, .... 
•24 
187 
Width of first abdominal somite, ..... 
•27 
210 
Width of second abdominal somite, ..... 
•27 
210 
Width of third abdominal somite, ..... 
•27 
210 
Width of fourth abdominal somite, ..... 
•27 
210 
"Width of fifth abdominal somite, ..... 
•27 
210 
"Width of sixth abdominal somite, ..... 
Width of telson between postero-median spines, 
•26 
199 
•08 
62 
Width of telson (greatest), ...... 
•26 
199 
Length of paddle of exopodite of sixth abdominal appendage, 
•06 
47 
Length of second joint of exopodite of sixth abdominal appendage, 
TO 
78 
Length of endopodite of exopodite of sixth abdominal appendage, 
TO 
78 
Distance between tips of sixth abdominal appendage, . 
•57 
444 
Length of first antenna, measured from tip of rostrum, 
•35 
273 
Length of flagellum of second antenna, .... 
•20 
156 
Length of scale of second antenna, ..... 
T3 
101 
Length of eye, ....... 
•09 
70 
Colour . — The fifth and sixth abdominal somites and the telson and uropods of the 
alcoholic specimen are colourless and rough, while the rest of the body is highly polished, 
and mottled with brown pigment. 
Remarks . — The only species which is at all similar to this is Wood-Mason’s Gono- 
dactylus glyptocercus from the Nicobars, but his description, which is given below, is so 
