MUSEUM OF COMPARATIVE ZOOLOGY. 117 



Fragments of an Errina, closely resembling E. aspera, have been also 

 found by me in a specimen of bottom from GOO fathoms, in lat. 31° 32' N. 

 and long. 78° 20' W. 



Errina glabra Poukt. 



Corallnm flabellate, not coalescing, with the older parts of the stem mas- 

 sive, faintly granulated and striated ; a row of very small perforated tuber- 

 cles <>n each side of the branches. Calicles very small, terminal on branch- 

 lets, obsolete on larger branches, and their place indicated by a small scale. 

 Septa indistinct. Columella styliform in a deep fossa. Ampulla? scarce 

 and small, smooth. Color white. Two or three inches high. 



It differs from Errina coclileata in having much thicker branches, even 

 when young, forming smaller angles with the stems. The ampullae are not 

 spinous. The tuberculated pores are confined to the sides of the branches 

 and have seldom a distinct furrow. From Errina aspera, although resem- 

 bling it in general habitus, it differs in having slenderer branches, less nu- 

 merous ampullae, and lacking the large furrowed pores on the younger 

 branches. 



Distichopora sulcata Pourt. 



Corallum dendroid, much compressed, somewhat rugose. The calicles on 

 the edge, mostly confluent; fossa a deep round hole. Septa about 12. very 

 rudimentary ; the border of the calicle pierced by about eight or ten pores 

 which form lateral rows when the calicles are joined. Columella deep 

 seated, seldom visible, styliform, hirsute, similar to the columella of the 

 Stylasters. The interior of the calicle is studded with bead-like tubercles. 



This species differs from other known species of the genus in being 

 more compressed, having the pores larger, more distant, and when conflu- 

 ent forming a much deeper furrow. When the calicles are isolated, they 

 present all the characters of Allopora, as shown in A. oculina, Ehr. 



Found in 270 fathoms off Havana ; rather scarce. Also in the shape of 

 worn fragments in a specimen brought up by the lead from 600 fathoms in 

 lat. 31° 32' X. and long. 7S° 20' W., which is near the outer edge of the 

 Gulf Stream off the coast of Georgia. 



Of the close relationship of Distichopora with the Stylasters, and still 

 more with the Alloporas, I entertain no doubt, after a careful examination. 

 Indeed., I can see no reason for separating generically Allopora and Distich- 

 opora, which appears to differ only by the confluence or non-confluence of 

 the calicles, both of which characters are found in the same individual in 

 the species described above. 



Heliopora tubulata Toukt. 



I refer with great doubt to that genus, a form of small corals of which I 

 have obtained but a few fragments, representing two species. Corallum 



