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. 

 gicadulpensis seems to be different. 



7. Asti-(ea rigida^ Dana; Prionastrcearigida^ M.-Edw. & H.; 



Isoj)}iyUia rigida, Verrill, 1872. 



8. Mussa dijiisacea^ Dana ; SymphyUia dipsacea^ M.-Edw. & 



H. ; Isophyllia dipsacea, Verrill. 



9. Madrepora sinuosa^ EIL & Sol. ; IsophylUa sinuosa, Ver- 



rill. The original diagnosis given by Ellis and Solander 

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

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

 accepted for this well-marked species. 

 10-20. SymphyUia strigosa, S. anemone^ S.conferta, S. Aglae, 

 S. heliantlniSj S. Tho^nasiana, S. asp)era, S. cylindnca^ 

 S. Knoxi, S. marqinata^ S. verrucosa, Duchassaing & 

 Michelotti, 1860. 



21. L{thop>hyUia multilameUa, Duch. & Mich. 1864. 



22. IsophyUia " Diultilamella,'''' 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 neiv. By Philip Henry Gosse, 

 F.R.S. 



[Plate X.] 



Family Alpheadse. 



Bellidia (gen. nov.), Gosse. 



Internal antennse very little above the external : composed 

 of two filaments forming a right angle. 



External antennae 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 abruptly. 



Tail-plates large, all undivided. 



* Mnssa fragilis, Dana, referred to Iiiophyllta by Verrill, is, according 

 to the description, a C'olpoj^hyUia. 



