22 BULLETIN 122, UNITED STATES NATIONAL MUSEUM. 



figured by Jeffreys has 30 ridges on the anterior area, while in tlw 

 type of Teredo (Teredo) morsei we have 47. The denticulated 

 median area is also much broader in the Morse shipworm than in true 

 navalis. In navalis, in the specimen figured by Jeffreys, there are 15 

 ridges, while in the Morse shipworm there are 27. They are also rel- 

 atively broader in Teredo navalis than in this species. 



I take pleasure in naming this species for Prof. Edward S. Morse, 

 of Salem, Massachusetts. 



TEREDO (TEREDO) BEAUFORTANA, new species. 

 BEAUFORT SHIPWORM. 



Plate 32, fig. 1. 



1908. Teredo navalis Sigeefoos, Bull. Bur. Fish., vol. 28, p. 94. 



The Terefio navalis referred to by Sigerfoos is not Teredo navalis, 

 notwithstanding the fact that I myself so identified it. 



In the light of accumulated material I am now willing to say, al- 

 though I have only the pallets at hand, that these, while they resemble 

 Teredo navalis more closely than do those of Teredo novangliae, are 

 nevertheless much narrower and more elongate than any that we have 

 seen of true Teredo navalis. They agree with those of Teredo navalis 

 in having the sides of the base almost straight instead of concave, as 

 in Teredo novangliae. 



They measure: Length, 5.2 mm., of wdiich 2 mm. go to the stalk; 

 diameter, 1.3 mm. 



I am sorry not to have the shells that belong to this mollusk, but 

 trust that they will be found by some one at the U. S. Bureau of 

 Fisheries Station at Beaufort. 



These specimens were taken at Rivers Island, Beaufort, North 

 Carolina, on November 16, 1909. They are registered as Cat. No. 



345346, U.S.N.M. 



TEREDO (TEREDO), species? 



The Jeffreys collection in the United States National Museum con- 

 tains a lot of young specimens. Cat. No. 194283a, sent by Prof. C. B. 

 Adams to Jeffreys from Jamaica. They were given the provisional 

 name Teredo spatha by Jeffreys, but under the microscope they easily 

 reveal the fact that they do not belong to this species. 



I do not wish to bestow a specific name upon this form until ade- 

 quate material will have been received, and we therefore merely list 

 it at the present time. 



Subgenus Teredothyra Bartsch. 

 1921. Teredothyra Bartsch, Proc. Biol. Soc. Washington, vol. 34, p. 26. 



In this subgenus the pallets are doubly cupped at the terminal 

 portion. 



Type. — Teredo {Teredothyra) dominicensis Bartsch. 



