ATHANAS. 
ATHANAS. Leach. 
Antenne superiores setis tribus instructe : 
inferiores corpore subbreviores setacew, basi squama magna apice externé unidentata 
instructe. 
Pedipalpi articulo ultimo penultimo longiore. 
Pedes decem ; par anticum majus didactylum ; par secundum aliis gracilius didactylum, carpo 
multi-articulato: paria alia consimilia ungue simplici terminata. 
Abdomen 6-articulatum apice pentaphyllum : lamella exteriore bipartita. 
Testa anticé rostro terminata. 
Upper antenne terminated by three sete : under ones setaceous, rather shorter than the body, 
and furnished at their base with a large scale, having a tooth on its external apex. Pedipalpes 
with their last joint longer than the preceding joint. Legs ten ; anterior pair largest didactyle ; 
second more slender than the others, didactyle, the wrist many-jointed ; other legs alike and 
terminated by a simple claw. Abdomen six-jointed ; the apex with five plates ; the exterior 
one composed of two parts. Shell anteriorly terminated by a rostrum, 
ATHANAS NITESCENS. 
Tas. XLIV. 
A. rostro recto inermi. 
Cancer (.Astacus ) nitescens. Montagu, MSS. 
Palemon nitescens. Leach Edinb. Encycl. vii. 401. 
Athanas nitescens. Leach Edinb. Encycl. vii. 432. 
— Trans. Linn. Soc. xi. 349. 
Encyel. Britan. Suppl. i. 421. 
Fig. 1. Athanas nitescens mag. nat. 2. A.nitescens auctus. 3. Antenna superior auct. 
4. Antenna inferior auct. 5. Pedipalpus auctus. 6. Pes anticus auctus. 7. Pes ‘secundus 
auctus. 8. Pes tertii paris auct. 9. Quarti paris ampl. 10. Quinti paris ampl. 
Athanas nitescens is occasionally found in pools left by the tide amongst the rocks on the coasts 
of Devon and Cornwall. 
It was discovered by Montagu, who sent it to me under the specific title mitescens ; the 
reason for this name is unknown. 
