56 



exopodites of the 1st maxillipeds end in a slender flagellum. The last segment 

 of the 2nd maxillipeds lies obliquely along the distal part of the inner border 

 of the propodite as. if it were a complemental piece of that joint. The first two 

 pairs of thoracic legs are slender. 



Family i. Pandalidse. None of the thoracic legs have exopodites ; the 1st 

 pair are microscopically and very imperfectly chelate (apparently monodactyl- 

 ous) ; the 2nd pair are minutely chelate and have a carpus compounded of two 

 or many segments. 



Family ii. Nematocarcinidse. All the thoracic legs except the last have 

 small exopodites ; the first two pairs are finely chelate and the carpus of the 

 2nd pair is simple. 



Alliance IV. PSALIDOPODOIDA, including the single genus Psalidopm, which 

 on the one hand is nearly related to the Glyphocrangonidss and Crangonidse and 

 on the other hand to the Hoploplwridse. Mandibles cleft into incisor and molar 

 branches, but the incisor branch is flexible and imperfectly calcified ; mandibular 

 palp stout, incurved. The exopodites of the 1st maxillipeds have the form of 

 a simple falcate leaf, without flagellum. The last segment of the 2nd maxilli- 

 peds is " complemental " of the propodite, as in the Pandoloida. None of the 

 thoracic legs have exopodites: the first pair end in forficulate chelae both 

 fingers being movable, the 2nd pair have a simple carpus and the dactylus 

 replaced by a pencil of seta?. 



Alliance V. CRANGONOIDA. Mandibles not deeply cleft into incisor and 

 molar branches, and having no palp. The exopodites of the 1st maxillipeds end 

 in a slender flagellum. The last segment of the 2nd maxillipeds is " comple- 

 mental " of the propodite as in Pandaloida. Except in a few species of 

 Crangonidx in which an exopodite is present on the 1st pair of thoracic legs, 

 exopodites are absent from the thoracic legs. First pair of thoracic legs stout, 

 subchelate. 



Family i. Crangonidie. The 2nd pair of thoracic legs, when present, have 

 a simple carpus. 



Family ii. Glyphocrangonidse. The 2nd pair of thoracic legs have a carpus 

 compounded of many segments. 



Alliance VI. PAL/EMONOIDA. Mandibles deeply cleft into well calcified 

 incisor and molar branches, and usually having a stout incurved palp. The 

 exopodites of the 1st maxillipeds end in a flagellum. The dactylus of the 2nd 

 maxillipeds is " complemental" of the propodite, as in Pandaloida, Grangonoida, 

 etc. None of the thoracic legs have exopodites : of the first two pairs one is 

 remarkably massive, both being chelate. 



Family i. Pal&monidsz. The 2nd pair of thoracic legs is robustly chelate, 

 one being often larger than the other, and has a simple carpus. 



