CLASSIFICATION OF CRUSTACEA. 



f. 4), a genus near Pilumnus and Menippe. Maxillipeds Cancroid, 

 abdomen in both sexes seven-jointed; lateral margins of carapax 

 parallel and entire, so as to resemble Cydograpsus Audouinii. Dis- 

 tance between the eyes one-fifth the breadth of the thorax. 



Etyosa, Leach (Mantell's Geol. of Sussex, PI. 29, f. 11, 12), has the 

 transverse form of Xantho. 



2. ERIPHIME (IJZanthopsie, M'Coy (Ann. Mag. N. H. [2], iv. 162), 

 approaches Actumnus in nearly orbicular outline and convexity of 

 carapax, but has the fingers "acuminated; the basal joint of the outer 

 antennae just reaches the front. 



fbdopilumnus, M'Coy (loc. cit., p. 165), very near Galene of De 

 Haan. It has the slender legs of our Pilumnus tenellus. 



3. ANOMOURA. Dromilites and Ogydramites of Edwards; Hela of 

 Count Miinster ; Basinotopus and Notopocorystes of M'Coy (Ann. Mag. 

 N. H. [2], iv. 167, 169). The form and sutures of the carapax, in 

 M'Coy's genera, and the character of the arms and of the posterior legs, 

 are very nearly as in JEglea. 



4. THALASSINIDEA. Magila, Aura, Cancrinos, Orphnea, Brisa, and 

 Brome of Miinster ; Megachirus and Pterochirus of Brown. 



5. ASTACIDEA. Coleia, Broderip (Geol. Trans. [2], v.); Qlyphea 

 and Pemphix, von Meyer (Foss. Krebse) ; Bolina, Miinster; Podo- 

 cratiis, Becks ; Archceocarabus and Hoploparia of M'Coy (Ann. Mag. 

 N. H. [2], iv. 173, 175). The species have the transverse suture 

 across the carapax, which distinguishes the Astacidea and most Tha- 

 lassinidea from the Caridea and Penaeidea. 



6. PEN.EIDEA. The following genera are referred to the Penaeus 

 group by De Haan (Faun. Japon., 187) : Anirimpos, Bylgia, Drobna, 

 Dusa, Blaculla, JEger, Udora, Kolga, Hefriga, Elder of Count Miinster, 

 and possibly, Rauiia and Bombur of the same author. In the first 

 seven of these genera all the legs are didactyle, and in Hefriga and 

 Elder all are monodactyle. The genus Saga of Count Miinster, De 

 Haan refers to the Mysidea. 



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