114 BULLETIN 100^ UNITED STATES NATIONAL MUSEUM. 



Teztularia Jlintii — Material examined. 



TEXTULARIA RUGOSA (Reuss). 



Plate 23, figs. 3, 4. 



Plecanium rugosum Reuss, Sitz. Akad. Wiss. Wien, vol. 59, 1869, p. 453, pi. 1, 

 figs. 3a, b. 



Textularia rugosa H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 

 363, pi. 42, figs. 23, 24. — Heron-Allen and Earland, Trans. Zool. Soc. Lon- 

 don, vol. 20, 1915, p. 625, pi. 47, figs. 7-9. 



Throughout the region in shallow water this species is common. 

 Except in a few cases the depths are less than 50 fathoms (91 meters) 

 and the most of these less than 25 fathoms (33 meters). 



This is the first record of the species from the North Pacific, but 

 it has been found in shallow water about several of the South Sea 

 Islands. It is a typical coral-reef species and at some shallow water 

 stations very abundant. 



The bottom temperatures of the shallow water stations were re- 

 corded but once, that being 75.7° F. (24.2° C), 37 fathoms (68 

 meters). 



There is a tendency in the largest specimens which may attain a 

 length of 6 mm. to contract the test, showing definite traces of sene- 

 scence. At the same time there is also a tendency to lessen the 

 amount of the excavations at the base of the chambers. In some of 

 the specimens these excavations are very deep and sharply sculp- 

 tured, giving the whole test a very ornate appearance. There is 

 some considerable variation in the size and depth of the excavations, 

 and they may become filled with amorphous material in some cases. 



Besides being widely scattered in shallow water in the Archipelago 

 proper, it is found to the southward in both Sibuko and Darvel 

 Bays, Borneo, but not in the deeper water of other stations in this 

 region. 



The specimen recorded by Flint from deep water off Bermuda does 

 not seem to belong here. Heron-Allen and Earland record it from 

 the Kerimba Archipelago off south eastern Africa, and note^° that 

 they "have specimens from the Pliilippine Islands one-sixth inch in 

 length." 



>» Joum. Roy Micr. Soc., 1911, p. 310. 



