246 



beak of the ventral valve broken off. North side of Maud Island, a 

 young but tolerably perfect specimen. 



The Alliford Bay sjiecimens correspond very well with the California 

 types of T. obesa in the great convexity of the valves, in being much 

 broader than long, and in being marked with a corresponding number 

 of radiating ribs. The small example from Maud Island looks more like 

 a Rhynchonella than a Terebratella, but the same remarks would apply 

 to Mr. Gabb's tin-ures of T. obesa. 



ANTHOZOA. 



ASTROC^NIA IRREGULARIS. (N. Sp.) 



Plate 33, fig. 1. 



Corallum compact, massive, irregular in shape : corallites contiguous, 

 polygonal and mostly hexagonal, averaging from fom* to live millimetres 

 in diameter : septa arranged obscurely in three cycles and of different 

 length in each : primary septa six, extending from the periphery to 

 the columella : secondary septa six also, but not quite so long as the 

 primaries : between the primaries and secondaries their intervenes a 

 third cycle of twelve short irregular septa : upper and outer edges of 

 the septa, as seen in the calyces, apparently granular ; columella styli- 

 form, raoj-e oi' less conspicuous in the centre of each calyx but not very 

 prominent : calyces shallow, about one mm. in depth. 



South side of Maud Island, two specimens, one of which has been 

 burrowed into by a Lithodomus. The same species was collected by 

 Mr. James Eichardson in 18*72 in Skidegate channel, west of Alliford 

 Bay. 



This coral resembles the Astrocoenia Beussiana of Stoliczka * in the 

 number and disposition of its septa, but the corallites of A. irregularis are 

 contiguous and fi-om four to five mm. in breadth, whereas those of A. 

 Beussiana are said to be distant and only from one to two mm. in 

 breadth. 



* Palaeontologia Indica, Cretaceous Fossils of S. India. Vol. 4, pt. 4, p. 28, pi- v. figs. 3-5. 



