Boone, Coelenterata, Cruises of "Ara" and "Alva" 75 



fourths of their length, although a few, where crowded in the 

 clusters, are laterally united for seven-eighths of their length. 

 The septa are in four cycles, the fourth cycle being merely slightly 

 raised costae, very thin, uneven, and imperfectly developed. The 

 primaries are distinctly thicker than the other series, proximally 

 joined with the columella, widest and thickest toward the base, 

 quite narrowed distally, the inner margin slightly concave, the 

 distal margin not projecting beyond the wall in small corallites, 

 but frequently in the larger corallites protruding as a small, tri- 

 angular process, in which instances the marginal wall is a series 

 of repeated concavities between these triangular elevations. The 

 secondaries are similar to the primaries and also joined to the 

 columella, but never extend beyond the marginal wall and are 

 narrower and thinner than the primaries. The tertiaries are not 

 united with the columella, frequently do not extend to the distal 

 margin and are very thin. The columella is spongy, well devel- 

 oped, nearly half as broad as the cell. The cell is not quite circular, 

 slightly oval, with the long diameter 1 to 1.5 millimeters greater 

 than the short diameter, as 11 millimeters by 10 millimeters, or 8 

 millimeters by 7 millimeters in the smaller ones ; the depth 5 to 7.5 

 millimeters. 



The six clusters taken by the "Ara" have the following meas- 

 urements, expressed in millimeters : Vertical diameter : 54, 55, 50, 

 45, 50, 50 ; horizontal long diameter : 72, 70, 60, 70, 60, 71 ; hori- 

 zontal short diameter: 55, 60, 55, 55, 70 and 45. 



In "The Natural History of Many Curious and Uncommon 

 Zoophjrtes collected from various parts of the Globe," by the late 

 John Ellis, Esq., F.R.S., systematically arranged and described by 

 the late Daniel Solander, M.D., F.R.S., London, 1786, there is an 

 illustration, Plate 32, figure 1, without legend, which apparently 

 is "No. 7, Madrepore tibicina Ellis and Solander." Dr. Solander's 

 description states (loc. cit., p. 154) : 



"Madrepora fafciculata, ramis cylindraceis ; ramulis fubclav- 

 atis, ftellis obconicis profundis, lamellis nonnidlis latioribus. 

 Centra fubfimplicia. Lamellae quaternae vel fexternae reliquis 

 multo latiores." No locality cited. 



When Ellis and Solander's engraved illustration, plate 32, fig. 

 1, is placed beside Vaughan's photographic plate of Verrill's type 

 of Dendrophyllia manni, the only differences apparent are of size 

 of colony, more numerous cells and the fact that, due to drawing. 



