366 Dr. Leacn’s Arrangement of the Crustacea, 4c. 
Spec. 1. Stenosoma lineare. 
s. caudä segmento ultimo basi subangustato apicem versus dila- 
tata: apice truncato emarginato. 
Oniscuslinearis. Penn. Brit. Zool. iv. pl. 18. fig. 2. 
Spec. 2. Stenosoma acuminatum. 
S. caudä segmento ultimo acuminato. 
Stenosoma acuminatum. Leach, Edin. Encycl. vii. 433. 
Habitat in mari Danmonie: semel obvium. 
B. Cauda lamellis duabus utrinque instructa. 
DIVISIO Ill. 
Cauda segmentum penultimum brevissimum ; ultimum angustius 
elongatum, utrinque lamellis duabus elongatis. Antenne sub- 
equales, und post alteram in line fere horizontali insertze. 
Gen. 20. ANTHURA. 
“Valente breves, interioribus paululum longioribus. Pedes ante- 
riores manu ungue seu pollice instructi. Corpuslineare. Cauda 
lamellis duabus foliaceis utrinque instructa. 
Spec. 1. Anthura gracilis. | 
Oniscus gracilis. Montagu, Linn. Trans. vol. ix. tab. 5. fig. 6. 
Anthura gracilis. Leach, Edin. Encycl. vii. 404. 
It is probable that Oniscus cylindricus of Montagu, Linn. Trans. 
vol. vii. tab. 6. fig. 8. is referable to this family. 
DIVISIO IV. 
Caud@ segmentum ultimum maximum utrinque appendiculatum. 
Antenne per paria uno ar alium positee. 
SUBDIVISIO 
