65 
GENUS ACHJEUS .* snout not much lengthened, and on 
each side leaving uncovered the insertion of the stalk of the 
external anlennsc. The terminal articulation of the two 
posterior pairs of legs is large, compressed and falciform. 
CRANCH’S SEA SPIDER. A. Cranchii. M. Edwards’ 
Crust, vol. 1, p. 281. Leach’s Malac. pi. 22. A rare spe- 
cies, the only British recorded specimen having been taken 
at Falmouth. 
GENUS INACHUS : differing from the two former genera 
in having retractile eyes capable of extensive motion, second 
pair of legs thrice as long as the post-frontal portion of the 
carapace ; terminal portion of the four hinder pairs similar 
and slender. 
SCORPION SEA SPIDER. 1. Scorpio, M. Edwards’ 
Crust., vol. 1, p. 288. I. Dorsettensis, Leach’s Malac. pi. 
22. Cancer D, Pennant, pi. 9, fig. 18. Commonly taken 
in crab pots within a few miles of the shore at all depths. 
FEEBLE INACHUS. /. Dorynchus, M. Edwards’ Crust., 
vol. 1, p. 288. Leach’s Malac., pi. 22. Not uncommonly 
found on board crab boats. Except in the rostrum it has 
much of the aspect of Stenorrhynchus Longirostris, but is 
less common. 
SMALL SNOUTED INACHUS. I. Leptorhynchus, M. 
Edwards’ Crust., vol. 1, p. 289. Leach’s Malac., pi. 22. 
M. Edwards assigns this species to the west of England, 
where it must be rare unless it has been confounded with the 
°ther Sea Spiders. In the Athenaeum at Plymouth I was fa- 
'oured by Dr. Edward Moore with the sight of a specimen 
n 'arked by Mr. Prideaux with the name of I Leptochirus, 
' v liich is al.-o figured by Dr. Leach as having been taken on 
the Cornish coast, and of which I possess a specimen; but 
whether, as seems probable, this be M. Edwards’, I. Lepto- 
Jnynchus I hesitate to decide. The latter author, lias not re- 
nted to Leach’s name. 
MAIANS— SEA SPIDERS, continued. 
genus pjsa : rostrum much developed, stout, formed of 
two lengthened horns, somewhat conical ; stalk of the ex- 
ternal antennas nearly on the level of the rostrum. 
* °UR SPINED SEA SPIDER. P. Tetmodon, M. Ed- 
wards’ Crust., vol. 1, p. 305. Leach’s Malac. pi. 20. Pen- 
na nt, pi. 8, fig. 15. Much larger than either of the former 
s pecies, and far more formidable in its appearance. Not 
common. 
UIBBS’ SEA SPIDER. P. Gibbsii, M. Edwards’ Crust., 
y°F L p. 307. Leach’s Malac., pi. 19. Not uncommon in 
'tom 1 or 2 to 20 fathoms of depth, and taken in crab pots. 
