THE SESSILE BARNACLES. 



175 



NORTH PACIFIC, BERING SEA, AND ARCTIC OCEAN. 



U. S. F. C. 

 StatiouNo. 



3232 

 2S51 



Locality. 



Depth 

 (fathoms). 



Point Barrow, Alaska 



Arctic Ocean 



Latitude, GO" 12' north; longitude, 108° 64' wast 



Bering Strait 



Latitude, G?" 37' north; longitude, 105° 19' wftst • .. 

 Latitude, G0° 10' north; longitude, 107° 41' west, off 

 Monroe Island. 



Plover Bay, Siberia 



Ochotsk Sea 



Bering Island 



Adalc Island, Aleutians 



Unalaska 



Iliuliuk, Unalaska 



Latitude, 58° 31' 30" north; longitude, 15V ° 34' 15" 

 west. 



Latiuide, 54° 55' north; longitude, 159° 52' west 



Belkofski, Alaska 



Cold Bay, Shehkof Strait 



Alaska 



Douglas Island, near Juneau (Pleistocene) 



Loring, Revillagigedo Island, Alexander Archi- 

 pelago. 



Quarantine Station, Port Townsend, Wash 



Tacoma, Wash 



Point Richmond, San Francisco Bay 



Santa Bai'bai-a, Cal 



35 

 2?,-4 



Collector. 



E. A. Mcllhenny. 

 U. S. R. S. Coruin. 

 Lt. Geo. M. Sfoney. 

 Dr. Robert White. 

 Lieut. Goo. M. Stoney. 

 Do. 



W. n. Dall. 



Capt. Stevens, North Paclflc 



exploring e.xpedilion. 

 L. Stejiiesrer. 

 W. H. Dall. 



Do. 



Do. 

 Albatross. 



Do. 

 W. H. Dall. 

 T. W. Stanton. 

 U. S. R. S. Corwin. 

 W. H. Dall. 

 Albatross. 



Do. 

 Mrs. W. B. Hare. 

 C. H. Towusoud. 

 Not recorded. 



BALANUS CRENATUS CURVISCUTUM, new subspecies. 



Plate 41, figs. 1, 4 ; plate 42, figs. 1-lb, 2-2d. 



Type.— Cut Xo. 48037, U.S.N.M., from Bristol Bay, Alaska, col- 

 lected by C. L. McKey. Growing on Mytilus. 



Form usually cylindric, the walls thin, weak, or fragile, white, 

 formed of ver^y thin outer and inner laTnince joined by delicate septa 

 forming square or irregular pores, of which there are 10 to 12 in 

 the rostrum. Parietes smooth or nearly so. Radii rather narrow 

 usually, but sometimes wide in the rostrum. Basis very thin, pore- 

 loss. 



Size rather small, the largest 11 mm. in diameter, with a height 

 of 11 mm. The figured type measures, diameter 10 mm., height 

 11.4 mm. Another of the same group measures, diameter 9.5 mm., 

 height 12.3 mm. 



The scutum is usually warped strongly, externally concave between 

 base and apex. It has an unusually long hasal nuirgin, equal to or 

 exceeding the tergal margin, is thin, and smooth inside, without 

 callouses or distinct muscle impressions. The articular ridge is thin 

 and well reflexed. 



The tergum has the spur nar-roicer than in crenatus, the articular 

 ridge forms a triangular projection overhanging the furrow and 

 scutal margin. The scutal border is rather broadly inflected at a 

 right angle with the face of the valve. 



The maxilla has a notch below the upper pair of great spines, 

 several small spines standing in it. The edge advances below the 



