The Corals of Delafield. ' IS 9 



author states that the number of rays found on these star-like 

 prominences is from eight to twelve. Ours display from five to 

 eighteen of these processes. The raised hexagonal border which 

 he notes in the interspaces between the stars is shown in but a 

 single specimen in our collection, and only imperfectly there. 

 The star-like prominences in our specimens are much more irreg- 

 ular in form and arrangement, and the pores occupying the inter- 

 stellar spaces have plainly-marked raised rims as in the genus 

 Trematopora heretofore described. 



Closely resembling this species in some of its forms stands a 

 newly described species Monticulipora punctata, (An. ^Report, Wis. 

 Greol. Sur. p. 71). This is a very variable form, especially as 

 to surface markings. It is a cylindrical, branching coral, the 

 stems varying from one-eighth to three-fourths of an inch in 

 diameter. Some specimens display tubercular prominences very 

 closely resembling those of the form last described ; others show 

 none of these raised figures. The surface of all specimens 

 referred to this species is studded with non-cellular, minutely 

 porous interspaces separated by surfaces marked by cells and 

 pore-marked walls, just such as are shown by repre:-:entative5 of 

 the genus Fistulipora. About these interspaces the larger cells 

 are sometimes arranged in radiating lines or ridges. In these 

 forms the resemblance to Stellipora is very marked to the unas- 

 sisted eye. Under the lens, however, the arrangement of cells, 

 cell walls and porous surfaces of cell walls and interspaces brings 

 out the resemblance to the other genus just mentioned. The 

 only marked difference between this form and those described as 

 Fistulipora is the presence and prominence of the interspaces, and 

 these are mentioned by Dr. Rominger, of Michigan, as character- 

 istic of the latter genus. This author would doubtless place it at 

 once under that genus. 



We present also three other very closely allied forms of the 

 genus Moniiculipora. These are nearly alike in mode of growth, 

 of branchiDg, and in thickness of cell walls. 



A detailed description of the first species will serve as a basis 

 for all. Prof. Whitfield describes it as growing in strong, solid,- 

 somewhat flattened, frequently branching stems, covered with 



