CORALLINACE^. 133 



Melobesia verrucata. The warty Melobesia. 



Fronds thin, expanded, irregularly lobed, pale, growing 

 on sea-weeds. Spore-conceptacles small, very numerous. 



Melobesia pustulata. The pimpled Melobesia. 



Fronds thick, oblong or lobed, incrusting, smooth, dull 

 purple or green, growing on Pliyllophora rubens, etc. Spore- 

 conceptacles large, rather prominent, conical, numerous. 



The forms referred to under the four last- mentioned 

 names are probably only varieties of some of the pre- 

 ceding species, resulting from circumstances of growth. 

 They are figured and described in the e Phycologia Bri- 

 tannica/ but only as " reputed species." 



Order X. HAPALIDIACEA 



Minute calcareous Sea-iveeds, composed of a single plane of 

 cellules. 



Genus L. HAPALIDITJM. 



Frond fan-shaped or lobed, composed of a single series 

 of hyaline cellules. — HAPALiDiTJii, from the Greek ajpalos, 

 delicate, and lithas, a little stone. 



Hapalidium phyllactidium. The fan-shaped Hapa- 

 lidixun. 



Parasitical on Chylocladia clavellosa. 



This very beautiful little Sea- weed was discovered by 

 Professor Allman on a specimen of Chylocladia cla- 

 vellosa, which was growing on the shell of an oyster 

 served up for supper. Dr. Harvey, writing on the sub- 

 ject, takes the opportunity to point out this occurrence 



