MEGALOPA. 
MEGALOPA. Leach. 
Antenne externe setacee articulis elongatis : 
interne setis duabus articulatis terminate ; superiore longiore. 
Pedipalpi externi caule interno articulis duobus primis compressis ; secundo breviore apice 
exteriore producto palpigero. 
Pedes decem ; par anticum majus didactylum ; paria alia consimilia ungue simplici instructa. 
Abdomen 7-articulatum. 
Testa elongata anticé rostro lato instructa. 
Oculi maximi ; peduncula oculis non angustiora, articulo secundo cylindrico. 
External antenne setaceous, with elongated joints: the internal ones terminated by two 
articulated sete, the upper of which is the longest. External pedipalpes with the two first 
joints of their internal footstalks compressed ; the second shortest with its internal point pro- 
duced and palpigerous. Legs ten ; the anterior pair largest and didactyle ; other pairs alike, 
terminated by a simple claw. Abdomen seven jointed. Shell elongate, the front furnished 
with a broad flat rostrum. Eyes very large, their peduncles not narrower than the eyes, with 
their second joint cylindric. 
MEGALOPA MONTAGUI. 
Tas. XVI.--- Fg. 1---6. 
M. rostro integro apice uni-spinoso, testa posticé inermi, coxis octo anticis spina curvata 
instructis. 
Cancer rhomboidalis. Mont. Trans. Linn. Soc. vii. 84. tab. vi. fig. 1. 
~ Megalopa rhomboidalis. Leach Edinb. Encycl. vii. 431. 
Fig. 1. Megalopa Montagui mag. natur. 2. Eadem aucta. 3. Antenna externa 
amplificata. 4. Antenna interna auct. 5. Pes anticus sinister auctus. 6. Pes secundi paris 
ampl. 
Montagu discovered one specimen of this species amongst corallines on the back of Maia 
Squinado, on the southern coast of Devon ; and I have received from J, Bulwar, Esq. two 
others that were taken amongst some floating marine plants in Torbay. 
