THE SESSILE BAKITACLES. 



173 



C. H. Townsend in 1S90. The walls are smooth; radii rather nar- 

 roAv; parietcs having an unusually large number of tubes, 13 to 17 

 in the rostrum. Spur of the tergura short. The scutum is about 

 typical. The largest examples have a basal diameter of 8 mm. It 

 has the external appearance of B. improvisus. 



The farthest south known for /?. crcnatus in the Pacific is Santa 

 Barbara, California. A few opercular valves and detached compart- 

 ments were found in debris washed from Balanus tlnt'mmiljulum cali- 

 fornicus and the rock it grew upon. The valves seem nearly typical, 

 but the compartments are thin with smooth outer surface. Complete 

 specimens are needed to show the characters of the race. 



Pleistocene specimens of this species are in the United States Na- 

 tional Museum from Lawlors Lake, St. John County, New Bruns- 

 wick, Brunswick, Maine, and Douglas Island, near Juneau, Alaska, 

 where they were collected by Dr. Wm. H. Dall " 200 feet above tide- 

 water, in a trench of the pipe line near old mill in bowlder chw." 

 The specimens do not differ from recent forms found in neighboring 

 waters. European. 



EAST AMERICAN. 



« Greenland specimens without nearer indication of locality are in the mu.seum from the J. G. Joflroys 

 and Lsaac Lea collections, with others fiom unknown source. 



'Many specimens, some very fine groajis, the gifts of Gloucester fishermen, are in the United Stat«3 

 National M usoum from the Grand Bank of Nowfotnidland, the Banquereau and Georges Banks. As these 

 areas are fairly covered by the e.xactly located stations of the Fish Commission, the lots designated by banks 

 only are not entered hera 



