iBi4 CRUSTACEA. 



in a straight or slightly curved compressed point. They are all 

 foreign to Europe *, 



There, the body is extremely narrow and depressed, and the last 

 segment almost square, entire, and withovit dentations or spines. 

 The lateral appendage of its last six feet is in the form of an almost 

 orbicular and slightly bordered palette ; the antennae and feet are 

 shorter than in the preceding ; the penultiraute segment of the large 

 claws has its inner margin fringed with numerous cilia in the form 

 of little spines ; the figure is falciform. 



CoRONis, Latr. 

 But a single species is known f . 



In the remaining Stomapoda of this family the shell is almost 

 membranous and diaphanous, covers the Avhole thorax, is curved 

 laterally beneath, prolonged anteriorly into a spine or cnsiform blade, 

 and projects above the base of the mediate antennae and of the eyes. 

 This base or support is susceptible of being curved under and en- 

 closed in the case formed by the curvature of the shield. The pos- 

 terior fins are concealed under the last segment. 



These very small, soft Crustacea, are peculiar to the Atlantic 

 Ocean and the Eastern seas. The fingers of the large claws have 

 no teeth ; the second joint of the ocular pedicles is much larger than 

 the first, and has the figure of a reversed cone ; the eyes properly so 

 called are large and almost globular ; the fin-like appendage of the 

 feet resembles that of the Squillce and Gonodactyli. In the 



Erichthus, Latr. — Smerdis, Leach, 



The first joint of the ocular pedicles is much shorter than the 

 second ; the middle of the lateral edges of the shield has a strongly 

 angular dilatation, and their posterior extremity exhibits two teeth \. 

 In 



Alima, Leach, 



The first joint of the ocular pedicles is slender, cylindrical, and 

 much longer than the following one ; the body is narrower and more 

 elongated than that of an Erichthus : the lateral borders of the shield 

 are nearly straight or are but slightly dilated ; there is a slight 

 longitudinal carina on its middle, and each of its angles forms a 

 spine, the two posterior of which are the largest §. 



FAMILY II. 



BIPELTATA. 



In this family we find the shell divided into two shields, the anterior 



* Squilla scijUanis, Fab.; Rumph. Mus., Ill, F; — Squilhi rliiragra, Fab.; 

 Desmar. Consid., XLIII. See the article Squille, of the Encyclopedia Mcthodique. 



t See Encyclop. Method., art. Squille. Squilla eiisehiu F Risso. 



+ Erichthus vilreus, Lat. See art. Squille, Atl. d'Hist. Nat. of the Encyclop. 

 M(''thod., pi. cccliv ; and Desmar. Consid., XLIV, 2, 3. 



§ Alima hyalina, Lat., Encyclop. Method., art. Squille, and Ibid. Atl. d'Hist. 

 Nat., CCCLIV, 8 ; Desmar., Consid., XLIV, I. 



