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University of California Publications in Geology [Vol. 10 



ASTRANGIA BOREAS, n. sp. 

 Plate 5, figures 2a, 2b, 2c 

 Type, no. 11324, Univ. Calif. Coll. Invert. Palae. From the Treadwell mine, 

 Alaska. 



Colony with base somewhat encrusting but extending upwards as 

 irregular, short branches ; reproduction by basal expansion and also by 

 buds arising irregularly from the sides and within the calices of older 

 corallites ; corallites, frequently narrow near base, becoming wider 

 above. Costae almost obsolete, smooth, on some portions visible nearly 

 to the base, of the same number as the septa. Septa numerous, thin, 

 dentate, lateral faces with few small granules, arranged in four or 

 five cycles, of which the first two reach the columella, some of the septa 

 of the later cycles fused to the earlier cycles without regularity. Calice 

 deep, nearly circular. Wall rather thin. Columella well developed, 

 spongy, rather small in proportion to the size of the calice. Greater 

 transverse diameter of one of the largest calices of type, 15.5 mm. ; 

 lesser transverse diameter, 12.5 mm. ; height of corallites varies greatly. 



Occurrence. — A letter dated June 20, 1890, sent to Professor Jo- 

 seph LeConte by the collector, M. A. Knapp, gives the following 

 description of the locality at which the specimens were found, "On 

 the quartz croppings of this (Treadwell mine) ledge, 175-180 feet 

 above sea-level and about 500 yards from shore. ' ' Pleistocene ( ? ) , 

 Douglas Island, southeastern part of Alaska. 



ASTRANGIA GRANDIS, n. sp. 



Plate 5, figures 5a, 5b 



Type, no. 11325, a well preserved specimen in Calif. Acad. Sci. Coll. from 

 locality 76, at Waldorf Asphalt mine, in hills about four or five miles south of 

 Guadalujne, Santa Barbara County, California. 



Corallum incrusting a fragment of rather soft shale saturated with 

 asphalt ; base expanding as a thin coating ; corallites large, new ones 

 apparently arising from basal expansion of the older ; calicular fossa 

 deep, elliptical. Externally ornamented by distinct, coarsely granu- 

 late somewhat angular costae extending to the base : interspaces wide, 

 occasionally with a small granulate rib. Wall rather thin, slightly 

 thickened internally. Septa thin, coarsely dentate ; lateral faces with 

 numerous pointed granules ; in about five incomplete cycles, of which 

 the first three reach the columella ; fourth cycle fused to the earlier 

 cycles; fifth small, free. Columella rather dense, not large in propor- 



