SQUILLOIDEA. 



615 



appendages largely developed; and the latter have them small or 

 wanting. The accepted genera are as follows : 



Fam. I. SQUILLIDiE. 

 Rostrum sutura a carapace disjunctum. 



G. 1. Lysiosquilla, Dana. — Corpus laxe articulatum. Carapax Isevis, antice 

 vix angustior, perbrevis, segmentis cephalothoracis fere quinque posticis carapace 

 non tectis. Abdomen latitudine e basi sensim increscens superficie nou costatum. 

 Segmentum caudale parce transversum, spinis duabus mobilibus postice non 

 armatum. Segmentum antennale partim nudum, testa parva. Chelae maximse 

 digitus spinis longis armatus. 



G-. 2. Squilla. — Corpus sat laxe articulatum. Carapax ssepissime costatus, subob- 

 cordatus, antice multo angustior, angulis anticis saepius acutis, segmentis cephalo- 

 thoracis fere quinque posticis carapace non tectis. Abdomen latitudine e basi fere 

 ad medium sensim increscens, lateribus deinde saepius parallelis, segmento postico 

 parce transverso, spinis duabus mobilibus postice non armato. Segmentum an- 

 tennale testa raro omnino tectum. Chelae maximse digitus spinis longis armatus. 



G-. 3. Pseudosquilla (Guerin, in Collect.)*— Corpus stricte articulatum. Carapax 

 laevis, valde convexus, segmentis cephalothoracis tribus posticis carapace non tectis. 

 Abdominis segmenta parte anteriore laevia, lateribus subparallelis, segmento postico 

 oblongo vel parce transverso, spinis duabus mobilibus armato. Segmentum 

 antennale testa saepe omnino tectum. Chelse maxima} digitus spinis longis armatis. 



G-. 4. Coronis. — Pseudosquillae affinis. Segmentum caudale breve, valde trans- 

 versum. Antennas internae quoad basin breviores. 



G-. 5. G-ONODACTYLUS. — Digitus chelae maximae basi tumidus, spinis brevissimis vel 

 nullis armatus ; carpus supra obsolete denticulatus et denticulis tenuibus non 

 pectinate armatus. 



Fam. II. ERICHTHIDiE. 

 Kostrum carapacis frons productus et non disjunct us. 



G-. 1. Squillerichtrus, Edw. — Erichiho affinis. Appendices branchiales abdo- 

 minis grandes. Digitus chelae maximae intus dentatus vel spinosus 

 Gr. 2. Erichthus, Lamarck. — Appendices branchiales sive parvi sive obsoleti. 



* We have seen only a figure of a species of the genus Chhridus of Eydoux and 

 Souleyet ( Voy. de la Bonite, pi. 5, f. 2, C. Latreillii), the description not being pub- 

 lished. We suspect from the figure, that the group may correspond to the " Squilles 

 Trapues" of Edwards, or the Squillse Parallels of De Haan, Pseudosquillce, above; but 

 we wait for published statements before recognising it as a synonyme or otherwise. 



