84 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



shown in some specimens of J. obtusa which with their more bulbous 

 basal end may represent the megalospheric form of the species. 



From the obtainable data neither of the two species occurs in great 

 numbers, scattered specimens being the rule. 



JACULELLA ACUTA H. B. Brady. 



Plate 32, figs. 1-4. 



Jaculella acuta H. B. Brady, Quart. Joum. Micr. Sci., vol. 19, 1879, p. 35, pi. 3, 

 figs. 12, 13.— Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 19, No. 4, 

 1882, p. 143, pi. 12, fig. 432.— H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 255, pi. 22, figa. 14-18.— Goes, Bull. Mus. Comp. Zool., 

 vol. 29, 1896, p. 23.— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 269, pi. 9, 

 fig. 4.— RnuMBLER, Arch. Prot., vol. 3, 1903, p. 273, fig. 122 (in text).— 

 CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 70, figs. 90, 91 (in text).— 

 Heron-Allen and Earland, Trans. Zool. See. London, vol. 20, 1915, p. 609, 

 Ti-ans. Linn. Soc. London, vol. 11, pt. 13, 1916, p. 219. 



Description. — Test elongate, straight, tapering, tubular, proximal 

 end closed and acutely pointed, distal end broader, slightly con- 

 stricted to form the apertm*e which is circular, wall thick, composed 

 of coarse sand grains, firmly cemented, exterior rough, proximal 

 end of the test often reddish brown, distal portion grayish. 



Length variable, up to 25 mm. or even more. 



Distribution. — The only North Atlantic stations recorded for this 

 species are off the coasts of Norway and the British Isles and a 

 single station and a single specimen in the Gulf of Mexico recorded by 

 Goes. From the South Atlantic the Challenger dredged material 

 from south of Pernambuco, Brazil, 350 fathoms, and off Buenos 

 Aires, 1,900 fathoms. 



From the Albatross material I have had typical material only from 

 scattered stations all grouped in the region from Georges Banks to 

 the latitude of the Delaware Capes. Specimens occur only in small 

 numbers. Depths range from 852 to 2,045 fathoms, bottom tempera- 

 uresfrom34.4° to41°F. 



Jaculella acuta — material examined. 



