362 Messrs. J. Wood-Mason and A. Alcock on 
Length, from tip of rostrum to tip of telson, 100 millim. ; 
of carapace, from supraorbital to posterior margin, 22°5 
millim. ; of rostrum, from same point to apex, 26 millim. ; of 
antennal scale 15 millim.; of abdomen, from base to tip of 
telson, 53°5 millim. ; of telson 14°5 millim. 
One specimen from Station 116, 405 fathoms. 
° juv. Differs from the above in the rostrum only extending 
by a portion of its unarmed tip beyond the extremity of the 
antennal scale. 
Length, from tip of rostrum to tip of telson, 58 millim. ; 
of carapace, from supraorbital to posterior margin, 13°75 
millim.; of rostrum, from same point to apex, 11 millim.; of 
antennal scale 9°75 millim.; of abdomen, from base to apex 
of telson, 35 millim. ; of telson 10 millim. 
Colour in life bright red. 
One specimen from Station 112, 561 fathoms. 
@ jun. Much smaller than the above, the rostrum slightly 
ascendant, straight or only very faintly curved, short, 
extending about to the end of the second third of the antennal 
scale. 
Length of carapace 10 millim. ; of rostrum 5:25 millim. 
Rostrum !-toothed. 
Colour in life deep crimson. 
One much younger specimen, with another of the same age 
as that from Station 112, from Station 109, 738 fathoms. 
The above series of specimens proves that the rostrum 
increases in length from extreme youth to adolescence. 
An adolescent male was taken in a previous season 8 miles 
south-east of Cinque Island, in the Andaman Sea, in 500 
fathoms. 
Rostrum 4-toothed. 
Colour in life deep transparent blood-red. 
41. Acanthephyra brachytelsonis, Spence Bate. 
Acanthephyra brachytelsonis, Spence Bate, ‘ Challenger’ Macrura, 1888, 
p: 753, pl. exxvi. fig. 7, 9 ; Wood-Mason, Ann. & Mag. Nat. Hist. 
(6) vii. p. 195, ¢. 
One adolescent male from Station 113, 683 fathoms. 
Colour in life bright red. 
Two adolescent males and one young female were taken in 
a previous season 74 miles east of North Cinque Island, in 
the Andaman Sea, in 490 fathoms. 
Our series of specimens proves that the rostrum undergoes 
great changes in form and m length from youth to maturity. 
