Verrill, Notes on Radlata. 517 



the cell, uniting together by their tliickcned inner edges, down within 

 the cell, and sei)ai-nting the very small interseptal spaces from tlie cen- 

 tral opening ; within each interseptal space there can generally be seen 

 a minute rudimentary septa in the form of an ascending, prominent 

 point. Cells deep in the central portion, nearly filled up below by a 

 round, conical, minutely hirsute, whitish columella. The cells are 

 stellate, with very slightly raised borders, somewhat unequal in size, 

 and many are distorted ; two are often seen together and more or less 

 confluent, as if they had been formed by fissiparity or disk budding ; 

 others evidently originate by interstitial budding, while some very 

 small rudimentary cells are intermediate between the ordinary form 

 and the ampullie with central openings, indicating that those are made 

 by rudimentary or dimorphous forms of polyps. Color light minium- 

 red. 



Height 7 inches; breadth 5-50; diameter of cells "02 to "OS, the cen- 

 tral cavity about '01 of an inch. 



California,— Maj. Wm. Rich, U. S. A. 



Probably from the Gulf of California in deep water. 



The basal portion is dead and encrusted with various species of 

 Bryozoa, Serpulae, etc. It was collected by Major Rich during the 

 Mexican war. 



Allopora venusta Verrill, sp. nov. 



Allopora Ca'ifornica Pourtales, Bulletin M. C. Z., p. 136, 1868, {non Verrill), no 

 description. 



Plate 10, figure 9. 



Corallum encrusting and expanded at base, rising up in stout lobes 

 or branches, two inches or more high, some of the branches broad 

 and somewhat palmate or digitate, the terminal branchlets mostly 

 round and about '12 to '15 of an inch thick, obtusely rounded at tips. 

 Some of the branches contain worm tubes similar to those in the pre- 

 ceding species, with two openings side by side, and apparently of the 

 same nature with those found in Muricea formosa of Zorritos, (p. 435), 

 but other branches are quite solid. Ccenenchyma compact, havino- a 

 minutely granulous surface, with a few minute, scattered vesicles and 

 pores. Cells small, about -03 of an inch, regular, circular, with the bor- 

 der sharp and distinctly raised above the general surface ; some newly 

 formed cells may be seen scattered among the others, but consisting 

 only of a slight pit in the coenenchyma, sometimes very superficial 

 circular, and rounded at bottom, in other cases a little more advanced 

 showing the outlines of the septa and columella. The cells are irreo-u- 



