PENJEUS. 
PENvEUS. Fair., Latr., Bose , Leach. 
Antennee superiores breviores basi appendiculati : apice setis duabus aequalibus ; seta superiore 
inferne excavata. 
inferiores corporis longitudine, setaceae, decrescentes ; squama magna ad illarum basin. 
Palpi pediformes ai’ticulis quinque exsertis ; articulo ultimo obtusiusculo. 
Pedes basi appendiculati : sex antici didactyli ; alii simplices; unguibus edentulis. 
Abdomen sex articulation. 
Cauda pentaphylla ; lamellis duabus externis simplicibus ; lamella media apicem versus utrinque 
spinulis mobilibus instructa. 
Upper an ten me shortest with an appendage at their base ; apex with two equal setm; upper 
seta excavated below. Under antennas as long as the body, setaceous, decreasing towards their 
extremities, with a large broad squama at their base. Pediform palpi with five exserted 
joints, the last joint obtuse. Legs with a little appendage at their base : six anterior legs 
didactyle, the other legs simple, with toothless claws. Abdomen six-jointed. Tail with five 
lamellaj ; the two external lamellm simple, the middle lamella towards its apex furnished with 
little moveable spines. 
PENJEUS TRISULCATUS. 
Tab. XLII. 
P. thorace postice trisulcato ; rostro decendente supra multi-dentato. 
Squilla Crangon. Rondel, xviii. 547. viii. 
Penaeus trisulcatus. Leach Trans. Linn. Soc. xi. 347. 
Pig. 1. Penaeus trisulcatus mag. nat. 2. Antenna superior. 3. Antenna inferior 
4. Pedipalpus. 5. Pes antici paris. 6. Pes secundi paris. 7. Tertii paris 8 Ouartinam 
9. Quinti paris. 10. Cauda. r V 1 
Penceus trisulcatus which is the only British species yet discovered, was sent to Mr. Sowerbv 
by the Rev. H. Davies, who caught it on the shore of Anglesea. I have likewise received a 
specimen from the coast of Wales. 
The fourth and fifth segments of the abdomen are notched on each side 
