186 ZOOPHYTES. 



be Ehrenberg's Manicina gyrosa (G. Ixiii. sp. 4), as his description agrees better with it 

 than with Ellis's gyrosa (tab. 51, fig. 2), to which he refers. He describes it as follows : 

 " Quadripollicaris, turbinata, disco leviter convexo, stellis meandricis, gregatim collibus 

 perfectius discretis, 6'" latis, lamellis tenuioribus, angustis, collibus perpendicularibus, 

 pariete membranaceo, apice subacutis, leviter truncatis." He adds, " habitus, non cha- 

 racter Maniciruz. An novi generis prope Polyastram collocandi typus=Polyastra stipi- 

 tata: Podasteria?" 



Seba's No. 8, tab. Ill, appears to be the M. fragilis ; but he states that the lamellae 

 are not dentate : " Lamellis non dentatis, erectis, tenuissimis implicatis." May the edges 

 have been broken ? The ridges are more than half an inch broad, and resemble the 

 above in form and appearance. Lamarck refers this figure to his Meandrina pectinate, 

 and Ehrenberg to the same species (his Manicina pectinata) : but the character " very 

 thin lamellae" removes it from that species. 



15. MUSSA GYROSA. (Ellis.) Dana. 



M. glomerata, conveza, discis kngis, sinuosis. Corattum gyris 

 latis, septis crassis, media fere solidis. 



Convex, glomerate, disks long and sinuous. Corallum with the gyri 

 to of an inch broad, septa stout, at the centre nearly solid. 



East Indies ( ? ). Esper. 



This large species is described by authors from worn specimens 

 only. It is distinguished in this state by its stout and compact promi- 

 nent rounded septa or ridges, and its sinuous gyri, which, in Ellis's 

 figure, are scarcely more than half an inch wide. 



Madrepora gyrosa, Ellis and Solander, 163, Meandrina gyrosa, in part, Lamarck, 2d 



tab. 51, fig. 2. From a worn specimen. ed. ii. 388, No. 7. 

 , Esper, Fortsetz, i. 100, tab. 80, fig. 1. , Lamouroux, Exp. 55, pi. 51, fig. 2. 



A copy of Ellis's figure. , Blainville, Man., 357. 



16. MUSSA RECTA. (Dana.) 



M. glomerata maxima, discis longissimis, scepe rectis. Corallum gyris 

 1" latis ; septis crassis, solidis, vix cellulosis ; lamellis incequalibus. 



Glomerate, very large, disks very long, and often straight. Corallum 



