8 
THE VOYAGE OF H.M.S. CHALLENGER. 
This species is distinguished from all of the genus with which I am acquainted by the 
spine on the upper margin of the orbit in front of the eye, and the strong postocular spine. 
The single mutilated specimen (a male) was dredged off St. Paul’s Rocks in 10 to 80 
fathoms. 
It is described from a single crushed and mutilated specimen, with broken rostrum, 
and wanting all the legs, and the description and figures are necessarily very 
imperfect. 
Achaeus , Leach. 
Achaeus, Leach, Malacostraca Podophthalmata Britannia:, pi. xxii. fig. c., 1815. 
„ Milne Edwards, Hist. Nat. Crust., yoI. i. p. 281, 1834. 
„ Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. 643, 1879. 
This genus is very nearly allied to Stenorhynchus, and it is in fact only distinguished 
from it by the absence of rostral spines ; the rostrum in Achaeus being composed merely 
of two small acute or subacute lobes. The dactyli of the fourth and fifth ambulatory 
legs are usually but not invariably very distinctly falcated. The merus of the outer 
maxillipedes in certain species ( e.g ., the typical Achaeus cranchii) is shorter than in 
Stenorhynchus, and distally truncated. 
The species, which are small, are distributed nearly as those of Stenorhynchus, and 
two or three are found in the Seas of Japan; whence, I believe, Stenorhynchus has not 
been as yet recorded. On the other hand, I am not aware that Achaeus has been recorded 
from any intertropical locality. 
The following are the species known ; some of them may prove on careful revision to 
be mere varieties : — 
Achaeus cranchii, Leach = Macro-podia gracilis, Costa. European Seas (Medi- 
terranean, 70 to 75 metres, A. Milne Edwards). 
Achaeus Icicertosus, Stimpson = Achaeus breviceps, Haswell. East and North 
Australia. 
Achaeus japonicus, de Haan. Japan (to 50 fathoms). 
Achaeus tuberculatus, Miers. Corean Channel (to 36 fathoms). 
Achaeus lorina, Adams and White. Mindanao and Borneo. 
Achaeus spinosus, Miers. Corean Channel (to 30 fathoms). 
Achaeus afftnis, Miers. North-East and West Australia. 
Achaeus brevirostris (Haswell). East and North-East Australia. 
Achaeus laevioculis, Miers. Seychelles (4 to 12 fathoms). 
Achaeus tenuicollis, n. sp. Port Phillip and Bass Strait (33 to 38 fathoms). 
