REPORT ON THE AMPHIPODA. 261 



Fani. II. Phronimidse. — Antennae 2dse exsertae. Abdomen in ventrem se non flectens. Pedes 

 5ti etique sive crassi sive elongati, scepius prehensiles, quoque 3tii 4tique saepe prehensiles. 



Fam. III. Typhida3. — Antennae 2da3 sub capite thoraceque celatse et saepius replicatre. 

 Abdomen in ventrem saepe se flectens. Pedes 6 postici interdum abbreviati, articulo Inio 

 operculif ormi, interdum longitudine mediocres. 



The family CaprellidiB is not subdivided by Dana into subfamilies, but he distinguishes three 

 sets of genera in the following manner ; 1. Pedes thoracis numero 14, containing the genera 

 Proto, Leach, and Protella, Dana. 2. Pedes thoracis Ztii ifique omnino obsoleti, containing 

 Caprella, Lamarck, ^gina, Kroyer, Gercops, Kroyer. 3. Pedes Mi iti 5tique obsoleti, 

 with the single genus PodaUrius, Kriiyer. 



The family Cyamidre contains but a single genus. So also in the Gammaridea, the families 

 Dulichidffi and Cheluridae have but one genus apiece. 



The family Corophidfe is subdivided into three subfamilies. 



1. Clydonina;. — Styli caudales ; — Imi 2dique slices, subulati. 



2. CorophinK. — Antennae plus minusve pediformes. Styli caudales Imi 2dique bii-amei. 



3. Icilinio. — Antenn* non pediformes nee subpediformes, flagellis sat longis basique sat brevi 



instructa:'. Styli caudales ac in Corophinis. 

 The family Orchestidse contains the genus Orchestia with three subgenera, Talitrus, Talorchedia, 



and Orchestia, and the genus AUorchesfes, but no subfamilies. 

 The family Gammaridfe contains the following subfamilies : — 



1. Stegocephahnse.— Antenniu breves, superiores basi crassje. Mandibulse acie denticulata, 



instructae, palpo brevi, uniartioulato, intus dentato. Epimerae permagn». 



2. Lysianassinae. — Antennae breves, superiores basi crassae. Mandibidte apice parce dentatae et 



cuspidatae, acie vix instructae, palpo 2-3-articulato. Maxillipedes lamellis internis grandibus. 

 Epimera; permagnae. 



3. Leucothoinae. — Antennae superiores basi plus minusve graciles. Maxillipedes elongati, 



angusti, articulo longo unguiformi confecti, lamellis internis per/jrevibus. Mandibulae sive 

 palpigerse sive non palpigeraj, processu molari carentes. [An semper f]. Epimeras magna;. 



4. Gammarinae. — Antennae Imae basi graciles. ISIaxiUipedes sat lati, lamellis internis sat 



elongatis. Mandibulaj acie denticulata instruct;*; et altera accessoria quoque processu molari 

 et palpo 3-articulato. Pedes 10 postici non subprehensiles. 



5. Pontoporeinae. — Pedes 3tii 4tique plus minusve prehensiles ; 6 postici non prehensiles. 



6. Isffiinre. — Pedes quatuor vel sex postici subprehensiles. 



In the Hyi^eridea, the family Hyperidse is subdivided into three subfamilies : — 



1. Vibilinae. — Corpus forma paulo Gammaroideum. Caput oculique mediocres. Maxillipedes 



palpo parvulo instruct!. Palpus mandibularis tenuis. 



2. Hyperina;. — Caput tumidum. Oculi pergrandes. Palpus mandibularis tenuis. 



3. Synopinie. — Corpus gracilius. Palpus mandibularis sat brevis, latissimus. Oculi grandes. 

 The family Phronimidae contains three subfamilies ; — 



1. Phroniminae. — Abdomen versus basin sat gracile. Pedes 5ti magna manu didactyla vel niouo- 



dactyia confecti, 3tii 4ti extremitate graciles, non prehensiles. [Antenna? breves.] 



2. Phrosininae. — Abdomen versus basin sat crassum. Pedes 5ti prehensiles, monodactyli ; quo- 



que 3tii 4tique prehensiles. [Antennae sat breves.] 



3. Phorcince.— Pedes 5ti 6tique valde elongati et crassi, sed maun non confecti. [Antennae 



breves.] 

 In regard to the genera into wliich the subfamilies are distributed many observations are called 

 for. Among the Corophina?, genus 3, Piatopbium, Dana, has been considered to be tlie 

 same as genus 4, Cijrtupliiurn, Dana, but Haswell under another name revives the distmction. 

 See Note on Haswell, 1885. Genus 7, Cratophium, Dana, yields to genus 6, Podorerns, 

 Leach. Genus 9, Cerapodiiia, Edw., belongs to genus S, Ccrapus, Say. Pterijrjocera, 



