84 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



assigned to C. parisiensis, at least as far as the Gulf of Mexico region 

 is concerned, can be included under this variety. Specimens assigned 

 to C. -parisiensis from other regions should be examined to see whether 

 or not they are comparable to this. The fact that Brady figures at 

 least two other distinct forms as C. parisiensis has made records 

 depending on the Challenger figures alone of questionable position. 



Clavulina humulis, var. mexicana — material examined. 



CLAVULINA COMMUNIS d'Orblgny. 



Plate 16, figs. 4, 5. 



Clavulina communis d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 268, No. 4; Foram. 

 Foss. Bass. Tert. Vienne, 1846, p. 196, pi. 12, figs. 1, 2.— H. B. Brady, Rep. 

 Voy. Challenger, Zoology, vol. 9, 1884, p. 394, pi. 48, figs. 1-8 (not 9-13.).— 

 FoRNASiNi, Mem. Accad. Sci. Instit. Bologna, ser. 5, vol. 10, 1903, p. 146, 

 (312), pi. 0, fig. 20.— CusHMAN (part). Bull. 71, U. S. Nat. Mus., pt. 2, 1911, 

 p. 73, fig. 117 (in text); Bull. 100, U. S. Nat. Mus., vol. 4, 1921, pi. 31, fig. 1. 



Description. — Test elongate, subcylindrical, broadest near the 

 initial end, early portion triserial, later and in the adult the larger 

 portion uniserial, both portions circular in transverse section; cham- 

 bers numerous, distinct except in the triserial portion; sutures 

 generally distinct, little depressed; wall arenaceous, smoothly fin- 

 ished; aperture in the early portion at the side, in the later portion 

 small, terminal, circular, often with a short protuberant neck; color 

 light gray. 



Length up to 4 mm. 



Distribution. — The type-specimens which d'Orbigny had were from 

 the Adriatic. Fornasini has figured a specimen from this region 

 which shows what is probably typical C. communis. It is a cylin- 

 drical form with circular transverse section throughout, the chambers 

 distinct but nearly flush with one another. Brady has figured a very 

 similar series of specimens in the Challenger Report and I have had 

 similar ones from the North Pacific. This is evidently a widely 

 spread species and very uniform in its characters. Other forms have 

 been assigned to this species, but it seems best to give it definite 

 limits. 



