ART. 25 GENERA SIPHOGENERINA AND PAVONINA GUSHMAN 19 



GENUS PAVONINA d'ORBIGNY 



The genus Pavonina was originally described by d'Orbigny in 1826 *® 

 in a few words: "Plusiers ouvertures aux loges; test deprime laterale- 

 ment; loges concentriques." The type species Pavonina jidbeUif or mis 

 is given from Madagascar. There is no specific description, but a 

 figure is given, and the species is illustrated also in the Modeles, No. 

 56. The early chambers of the Modele show definitely alternating 

 chambers in the ones I have seen, but neither the 1826 figure nor its 

 modification in 1846 ^^ show tliis character. Neither does the more 

 elaborated description of 1846 make any mention of the textularian 

 character of the early chambers. Tliis lack of alternating chambers 

 in the figures given by d'Orbigny so deceived Parker and Jones that 

 in their review of d'Orbigny's 1826 work ^^ they conceive the idea 

 that it may belong to the Miliolidae and be a form of either Peneroplis 

 or Orhitolites. It was therefore not until Brady obtained good mate- 

 rial first from the Seychelles ^^ and later from the Challenger Expedi- 

 tion, ^° that the true structure of this species and of the genus became 

 known. Brady correctly placed Pavonina in the Textulariidae- 

 Moebius in 1880 ^^ described and figured specimens from Mauritius, 

 and still further calls attention to the true structure. Since the 

 excellent figures given by Brady also in the Challenger Report ^^ little 

 further needs to be added to tliis particular species, but since that 

 date other species have been distinguished. These will be noted 

 later. 



Genus PAVONINA d'Orbigny, 1826 



Pavonina d'Orbigny (type, P. flabelliformis d'Orbigny), Ann. Sci. Nat.y 

 vol. 7, 1826, p. 260; Foram. Foss. Bass. Tert. Vienne, 1846, p. 72.— 

 H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 274. — 

 Chapman, The Foraminifera, 1902, p. 169. — Cushman, Bull. 71, U. S, 

 Nat. Mus., pt. 2, 1911, p. 30; Bull. 104, pt. 3, 1922, p. 51. 



Description. — Test calcareous, hyaline, perforate, many-cham- 

 bered, the early chambers biserial, alternating, the later ones uni- 

 serial, broad, curved, in the type species becoming embracing, this 

 later series finally composed of one or more chambers; sutures 

 limbate; wall usually thin and translucent, coarsely perforate; aper- 

 tural wall with one or more rows of rounded apertural openings. 



The genus is known both in the Tertiary and in the present ocean^. 

 represented by several species. 



16 Ann. Sci. Nat., vol. 7, 1826, p. 260. 



" Foram. Foss. Vienne, 1846, pi. 21, figs. 9 and 10. 



" Ann. Mag. Nat. Hist., vol. 12, 1863, p. 440. 



» Ann. Mag. Nat. Hist., ser. 4, vol. 19, 1877, p. 41. 



so Quart. Journ. Micr. Sci., vol. 19, 1879, p. 68, pi. 8, figs. 29, 30. 



21 Beitr. Meeresfauna Insel Mauritius, 1880, p. 91, pi 8, figs. 13-15 



« P. 374, pi. 45, figs. 17-21. 



