488 ZOOPHYTES. 



Loose ramose, branches terete, spreading, proliferous at apex. Co- 

 rallum having the calicles tubiform, unequal, with the exterior echi- 

 nulate. 



Lamarck adds, that this species forms a broad and lax clump, con- 

 sisting of numerous branches, which are covered with prominent 

 calicles. Height about seven inches. From the "Austral Seas." 



Madrepora laxa, Lamarck, No. 6. 

 , Blainville, Man. d'Act., p. 390. 



The Heteropora laxa of Ehrenberg, from the Red Sea, appears to be a different spe- 

 cies. It is thus described : " Sesquipedalis, laxe ramosa, ramis intricatis, teretibtis un- 

 dique expansis, apice ramulosis, stellis inaequalibus, extus basi denticulato-asperis, superne 

 glabris, inferioribus margins tumido, superioribus longe tubulosis (lj-2'"), apertura ob- 

 liqua, terminalibus cylindricis, 1 lj'" latis." (Op. cit., G. Ixix. sp. 9.) 



Ehrenberg describes also the following species : " H. tubulosa (op. 

 cit. sp. 7). Semipedalis, erecta, ramosa, breviter ramulosa, undique 

 papilloso-tubulosa, tubulis longissimis (3'" longis), apertura terminali, 

 rotunda, mediocri (^'" lata), stellis [caliculis] terminalibus parumper 

 majoribus, tubulis hispidis, substriatis." Described from two frag- 

 ments in the Royal Museum at Berlin. 



H. regalis (sp. 11). " Subpedalis, ramosa, ramis teretibus, sensim 

 conicis, crassis, pollice angustioribus, passim ramosis, stellis tubulosis 

 levibus, apertura obliqua, interdum dimidiatis, terminalibus integris, 

 maximis, !'" latis, interstitiis slellarurn hispidis." Specimen in the 

 Royal Museum at Berlin. 



H. decurrens (sp. 12). " Quadripollicaris, habitu squarrosa, ramu- 

 losa, gracilis, ramulis subfastigiatis, stellis apice rarioribus, arctius 

 appressis, basi cariniformi in stirpe decurrentibus, hinc ramulorum 

 apicibus subangulosis, tubulis totis glabris, parcius integris, tenuiori- 

 bus quam in priore." Described from a fragment in the Royal Mu- 

 seum at Berlin. 



H. squarrosa (sp. 14). " Octopollicaris, cespitosa, hemispherica, 

 laxe ramoso-squarrosa, ramulis tenuibus, acutis, prolificatione spinosis, 

 stellulis parum prominulis, myxo rotundo suffultus, totis asperis, non- 

 nullis sub apice breviter tubulosis, apertura obliqua, stellis terminali- 

 bus incrassatis, latius apertis." Red Sea. Resembles somewhat 

 Esper's tab. 54. 



H. seriata (sp. 18). " Semipedalis, paulo latior quam alta, cespi- 

 tosa, brevius ramosa, ramis crassis, conicis, stellulis parum promi- 

 nulis, semitubulosis, hemisphericis, subsequalibus, series longitudi- 



