72 



their superficies more or less granulated or tuberculated. 

 The first truncal segment is without split in the hindcor- 

 ners, but has the underside of the epimer usually with a 

 more or less determined keel, ending in a little fold or 

 tooth. The caudal segments have a little process beneath 

 at the base of the epimera. The surface of the telsum most 

 often with one or sometimes with two longitudinal furrows. 

 The exopodit of the uropods is inserted in a pit at the 

 inner margin of the basal joint, and is conspicuous although 

 small. 



I give here some common terms for the species of 

 this group: 



Pedes maxillares: Palpus mala manifesto brevior, arti- 

 culus 3. perbrevis, non multo longior quam latior. 



Epistoma margine superiore tenui frontem ssepissime 

 multum superante, in medio reflexo et' plerumque impresso 

 vel etiam fisso. 



Linea verticalis marginalis capitis post in medio cras- 

 sior ssepe duplex, utrinque ad margines oculorum producta, 

 epistoma non attingens. 



Trunci segmentum 1. epimeris integris, tenuibus, infra 

 leviter per longitudinem curvate carinatis, carina in dentem 

 parvum vel minimum desinente. Margo posterior segmento- 

 rum plerumque fortius utrinque incurvus. Pronotum ^5 — V4 

 dorsi segmenti 2. explens. 



Caudse segmenta 3.-4.-5. processu inferiore inflexo parvo: 

 epimera segmenti 5. divergentia. Pleopodes primi paris in 

 femina nulla area operculari, in mare area operculari parva, 

 ovali instructi. 



Uropodum scapus nonnihil longior quam latior; exopo- 

 ditum mediocre vel brevius, lateri interiori scapi procul ab 

 apice insertum. 



a. Telsum in medio duabus carinis loiigitudinalibus instructum. (Species 

 28.-32.). 



b. Carinse telsi post coiivergentes, paulo ante apicem subconfluentes. 

 (Species 28.-29.). 



