646 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Heller described the species from the Adriatic Sea, Hincks redescribed 

 it from Great Britain, and O'Donoghue listed it from several localities 

 in British Columbia and Puget Sound. It is possible that the species 

 should be placed in the genus Tubulipora, but our specimens are incom- 

 plete in certain respects which prevent a final judgment. It has much 

 resemblance to D. intermedia O'Donoghue but the measurements are 

 larger and the fertile branches are adnate. 



Point Barrow, Alaska, 21 fms, Arctic Research Laboratory, G. E. 

 MacGinitie, collector. Also two specimens from Nash Harbor, Nunivak 

 Island, Bering Sea, 8-10 fms, on a shell. 



Diaperoecia intermedia (O'Donoghue), 1923 

 Plate 70, fig. 5 



Tubulipora intermedia O'Donoghue, 1923:10. 

 Diaperoecia intermedia, O'Donoghue, 1926:23. 



The zoarium is encrusting and branching, with short erect or semierect 

 branches which form small capitula. The zooecial tubes are all on the 

 ventral side. The stalks of the free branches are about 0.60 to 0.70 mm 

 wide and the capitula may reach a maximum width of 3 mm. The peri- 

 stomes are all free and moderately long to a maximum of 0.90 mm, 

 width 0.16 mm, the aperture 0.13 mm. 



The ovicell has its origin on the ventral side and expands upon the 

 top of the capitulum where it surrounds several peristomes ; it is con- 

 siderably inflated and thickly perforated. The ooeciostome is more or 

 less connected with a peristome at its base, nearly as tall as a peristome, 

 and noticeably smaller, its aperture 0.10 mm in diameter, varying in its 

 position but usually somewhere near the middle of the expansion. 



O'Donoghue very properly questioned the generic position of this 

 species, as the adnate portion of the zoarium is similar to that of 

 Proboscina and the ovicell bears some resemblance to that of Tubulipora. 

 The nature of the ovicell, enclosing a number of tubules, and especially 

 the position of the ooeciostome near the middle of the expansion (occa- 

 sionally quite proximal to it) suggest Diaperoecia where O'Donoghue 

 finally placed it. It may possibly be one of the various northern species 

 which have been described without the ovicell but there is at present no 

 proof of synonymy. 



The species was described from Departure Bay, British Columbia. 



Our specimens are from Point Barrow, Alaska, 125 to 522 feet, G. E. 

 MacGinitie, collector, common on shells and rocks. 



