330 Rev. T. Ifiiicks's Contrihation^ towards a 



Ibirl. (p. 68 Sep.). 



Celhjwra grnnu'm, sp. n. 

 For synonyms see Miss Jelly's ' Catalogue.' 



Waters has remarked that this species is closely allied to 

 Lagenipora spimdosay Hincks, and L. htcida, H. There are 

 no doubt points of resemblance^ but the difference? in the 

 structure of the zooecium &c. are probably of sufficient 

 importance to justify us in referring them to distinct genera. 

 The first of these species {L. sjnnulosdy he considers to be 

 probably identical Avith Cellepora hicornis^ Busk *. I am 

 indebted to Dr. Giinther's courtesy for the opportunity of 

 examining specimens of the latter from the ' Challenger ' 

 Collection, and I am inclined to think that they are distinct 

 forms. One of the marked features of L. spinuhsa is 

 the strongly reticulated surface of the cells. They are com- 

 pletely covered below the tubular peristome with rather 

 large roundish foramina closed in by a silvery-white mem- 

 brane and surrounded by a raised line, forming a distinct 

 network over the cell- wall. This is the usual and charac- 

 teristic structure, though occasionally in certain states it may 

 be more or less obscnred. Of this there is no mention in 

 Busk's description of Cellepora bicorins, nor is there a trace of 

 it in the specimens which 1 have examined. A few large 

 circular poies are present along the margin of the cell and 

 sometimes round the orifice. 



The aviculiferous processes in G. bicorm's, which are tall 

 and stout, are placed at the front of the peristomial orifice 

 (" praioral," according to Busk), and above them are fre- 

 quently two spinous processes; in L. spiuulosa they rise on 

 each side close to the iipper margin, and immediately below 

 the ocecium, when present. In tliis species the front margin 

 of the orifice (peristomial) is elevated above the rest, some- 

 what everted, plain or trimucronate; in C. bicorm's it is 

 usually sinuated between the aviculiferous processes f- 



The avicularium of this species is minute as compared 

 with that of the 'Challenger' form. There are also ditFer- 

 cnces in the ocecium. That of C. bicoriiis is small, globular, 

 smooth and glossy, with a roundish foramen closed in by 

 membrane ("■ fissure," Busk) in front, surrounded by a raised 

 line ; while that of L. spiuulosa is semicircular, usually 

 placed far back, and often considerably below the oritice of 



* ' Challenger' l\eport. jinrt 1, p. 20l', pi. xxx. tigs. 1 and 12. 

 t These processes appear to rise from the primary orifice. 



