16 BULLETIN «0, UNITED STATES NATIONAL MUSEUM. 



Near the eiuls of the cirri the .spines decrease in number, so that Hnall y 

 there are only one or two pairs on each joint. Near the base the joints 

 are much shorter than in the middle, and bear four pairs of shorter 

 spines. At the posterior margin of the cirrus, a small group of two to 

 four short spines springs from the distal end of each joint. Plate IV, 

 tig. 3, shows the arrangement of spines on a middle joint of the sixth 

 cirrus. The outer and inner faces of the cirri are alike, the latter not 

 hairy, and the two rami are of nearly the same length, composed of 

 about 45 joints. 



The terminal appendage (Plate IV, fig. 2) is very small, only about 

 2 mm. long, and composed of six joints. It terminates in a few long 

 bristles. 



Scalpellum inerme Annandale,'* from Bali Straits, 160 fathoms, is 

 clearly a derivative from the S. stearnsii stock, divergent in the 

 degeneration of the valves. The broad joints of the anterior branch 

 of the first cirrus resemble those of S. stearnsii^ but according to 

 Annandale's figure, there are fewer joints. The caudal appendages are 

 decidedly more developed in S. iricrrne. The mandible has numerous 

 teeth, as in S. stearnsii. 



SCALPELLUM SCALPELLUM (Linnaeus). 



1767. Le])as scalpellum hintiMvn, Systema natura>, 12th eil., p. 1109. 

 1824. Scalpellum vulgare Leach and of authors. 



Localities. — Cat. No. 12186, 32873, Shetland Islands, Jeffreys col- 

 lection. No, 12173, Unst, Shetland Islands, 85 fathoms, Jeffreys 

 collection. No. 12181, Swansea Bay, Wales, Jeff'reys collection. No. 

 12174, Plymouth (Bate), Jeffreys collection. No. 12175, Exmouth 

 Beach, Jeffreys collection. No. 12171, 150 miles from Land's End, 200 

 fathoms (Sir John Anderson), Jeffreys collection. No. 23188, Naples, 

 zoological station. 



There are also several lots without locality data, but all apparently 

 British. The series comprises some hundreds of examples, and was 

 brought together by J. Gwyn Jeffreys, the well-known conchologist. 

 The use of the specific name mdgare by Leach, Darwin, and later 

 authors, was in order to avoid tautonomy, but changes on this account 

 are now considered inadmissible, and I therefore revert to the Linnean 

 name. 



Abundant as this species is in the seas of northern Europe, it has 

 not been found on the American side. 



«Annandale, Malaysian Barnacles in the Indian Museum, Mem. Asiatic Soc. of 

 Bengal, I, No. 5, p. 75, 1905, pi. viii, figs. 1, la. 



