Mr. P. H. Gosse on a new Species of Crustacea. 313 



well, and perhaps even better, developed in /. sinuosa; 

 moreover the dentation of the septa in the original S. 

 guadid2?ensis seems to be diiFerent. 



7. Astrcea rigida^ Dana ; Prionastrcea rigidaj M.-Edw. & H.; 



Isojihyllia rigida^ Verrill, 1872. 



8. Mussa dipsacea^ Dana ; SyvijyhylUa dipsacea, M.-Edw. & 



H. ; Isophyllia dipsacea, Verrill. 



9. Madrepora siniiosa, Ell. & Sol. ; Isophyllia sinuosa, Ver- 



rill. The original diagnosis given by Ellis and Solander 

 is rather meagre ; but as the name has got a precise 

 meaning now hy Verrill's good description, it must be 

 accepted for this well-marked species. 

 10-20. SympJiyllia sfn'gosa, S. anemone^ S. conferta, S. Aglae, 

 S. heliantlius J S. Thomasiana, S. aspera, S. cylindrica, 

 S. Knoxi, S. marginaiaj S. verrucosa, Duchassaing & 

 Michelotti, 1860. ' 



21. Lithopihyllia midtilamella, Duch. & Mich. 1864. 



22. Isophyllia " multilamellar^'' Pourtales*. 



For want of sufficient material, I must leave the discrimi- 

 nation of the actual species to future researches. It is more 

 than probable that at least half the number of the above names 

 will prove to be merely synonyms. 



XXXVIII. — On Bellidia Huntii, a Genus and Species of Crus- 

 tacea supposed to be neic. By Philip Henry Gosse, 

 F.R.S. 



[Plate X.] 



Family Alpheadae. 



Bellidia fgen. nov.), Gosse. 



Internal antennee very little above the external : composed 

 of two filaments forming a right angle. 



P^xternal antennte with the basal plates very large. 



Feet : first pair small, didactyle, consimilar. Second pair 

 long, very slender, didactyle; both, arm and wrist many- 

 jointed. 



Eyes not covered by the carapace. 



Abdomen bent abru])tly. 



Tail-plates large, all undivided. 



* Mitasa frcKjilis, Dana, referred to Isophyllia by Verrill, is, according 

 U) the description, n C'olpophyUia. 



