266 Transactions.—Zoology. 
situated on a very slight eminence common to them with the posterior 
laterals, they look forward and slightly outwards. Posterior middles look 
upwards, posterior laterals upwards and outwards. 
Sternum a long heart-shape, flat, with concave emarginations opposite 
the coxe. 
Lip twice as long as broad, tongue-shaped, sides nearly parallel, but 
narrowing somewhat anteriorly, towards its origin it is pinched in and then 
widens to its insertion. Its anterior border is notched. 
Maxille cut obliquely away from the lip and running to a sharp point 
anteriorly, outer border rounded, pinched in anteriorly to the insertion of 
the palpi, flattish, but becoming more convex towards their insertion. 
Abdomen ovoid. Spinnerets short, diverging, the upper and lower pair 
rather longer than the middle pair. Legs long, slender, clothed with 
yellowish white hairs intermingled with bristles at distal end of third and 
fourth tibial joints. 
Tarsi have three claws, the two principal claws deeply combed, the 
posterior claw small, inconspicuous, not combed, and abruptly bent just 
beyond its origin. 
Male palpi long, slender. The radial joint has on its outer side a 
bifurcate process, the lower segment thin, broad, and flattened, yellowish, 
with the upper border thickened, and dark brown, the upper segment thick, 
very much narrower than the lower segment, from which it is slightly 
turned away, blunt at its point, dark brown. The digital joint ovoid, pro- 
longed, and tapering distally, and provided at its extremity with short, stout 
spines; the palpal organ has a coiled cirrhus about three-fourths the cir- 
cumference of the organ in length. The palpi are clothed with abundant 
long hairs. 
MEASUREMENTS, 
Totallength .. Rs F 0-015 
ephalothorax .. M .. 0:0042 
Falces .. NA oe .. 09-0042 
Abdomen X Vs xs UU 
Leg of 1st pair ap .. 00145 
: us : ^ i o verified exact in a second eponimen, 
4th. ,, is ss 0-0105 
Male palpus | .. 0:0075 
Female.— Colouring as ERA Cephalothorax more convex above. 
Falces slightly shorter but more massive. Fang thicker and stronger. 
Epigyne pale-yellowish. A small concavity with a denticle on either side 
pointing inwards, posteriorly a short blunt process directed backwards. 
Desis robsoni is excedingly like Desis martensii (Koch, Arachn. Austral.), 
which it also resembles in its marine habits. This is so interesting that I 
~ make no apology for quoting Dr. Koch's remarks in full ;— 
NEN ees SMR ae ee chen AA 
