U)\ Leach’s Avrangcmcnt of the Cvustacea, <^c. 369 
Spec. 2. Sphceroma rugicauda. 
S. corpora Isevi inermi, caud^ rugulos^: lateribus oblique trunca- 
tis, lamellis ellipticis; externis margine externo vix denticulatis. 
Sphaeroma rugicauda. Leach, Edin. Encycl. vii. 40o-433. 
Habitat in oceano Atlantico. 
Mus. Leach. _ 
Statura et magnitude praecedentis, et satis distincta, caucia 
rugosa, lamellis rotundatis nec acutis, antennarum inferiorum pe- 
dunculo longe minus crasso. Color cinereus, nigro lineatus, ma- 
culatusque. Oculi nigri. 
I discovered this species on the Isle of Ulva, one of the West- 
ern Isles, over against Mull, in the month of August. It was 
much more agile than S. serrata, which called my attention to 
minute examination. I met with several, but owing to an ac- 
cident only one remains. 
Spec. 3. Sphceroma Hooheri. 
S. corpore l^vi, caudae articulo ultimo tuberculis duobus ob- 
longatis subobscuris. 
Sphaeroma Hookeri. Leach, Edin. Encycl. vii. 433. 
Habitat in Suffolci4 ad littora maris; color cinereus aut rufescens, 
punctulis nigris sparsus. Cum copi4 crustaceorum benignis- 
sime communicavit amicus W. J. Hooker, cujus nomen gerit. 
** Antenna superiores pedunculo amplissimo. Ungues simplices. 
Gen. 26. iEoA. 
Oculi magni, granulati, oblongi, obliqui, marginales. Corpus 7- 
articulatum. Cauda 6-articulata, articulo ultimo majore, basi 
utrinque appendicibus duabus foliaceis instructa. 
Spec. 1 . 
