42 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



While all the microspheric specimens of this group have the typical 

 quinqueloculine development at least in the young, the adult char- 

 acters in various genera have a wide range from the three planes, 

 120° apart in Triloculina, the two planes 180° apart in Biloculina 

 to the unserial development of Articulina, the flattened form of 

 Hauerina, etc. All, however, have a similar quinqueloculine devel- 

 opment at least in the young of the microspheric form. 



Genus QUINQUELOCULINA d'Orbigny, 1826. 



Quinqueloculina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 301. (Type Q. semi- 

 nulum (Linnaeus). 



Description. — Test in the young with the usually oval proloculum 

 and short, Cornuspira-like second chamber, followed by the adult 

 character both in the microspheric and megalospheric forms of the 

 species. This adult character consists of chambers a half coil in 

 length added successively in planes 144° apart, five chambers being 

 thus added before a cycle is completed and a new chamber added in 

 the plane of the fifth preceding chamber and covering it exteriorly. 

 The chambers are thus 72° from one another, but each as added is 

 144° from its immediately preceding one in the series; aperture typi- 

 cally elongate with a simple tooth and with little or no elongation of 

 the neck except in certain of the more complex species. 



From a study of the development of various genera of this sub- 

 family it seems that d'Orbigny's characterization of the various genera 

 Quinqueloculina, Triloculina, Biloculina, etc., was very strictly in 

 accord with the actual relationships in the group. The later studies 

 by Munier-Chalmas and Schlumberger show that the quinquelocu- 

 line development not only has a distinct generic significance but that 

 it is phylogenetically very important in the development of the 

 various generic types of this subfamily. A rather full discussion of 

 the matter has already been given in the introductory pages and need 

 not be repeated here. 



QUINQUELOCULINA AGGLUTINANS d'Orbigny. 

 Plate 9, fig. 1. 



Quinqueloculina agglutinans d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. 



Cuba, 1839, "Foraminiferes," p. 168, pi. 12, figs. 11-13. 

 Miliolina agglutinans Siddall, Cat. Brit. Rec. Foram., 1879, p. 4. — H. B. Brady, 



Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 180, pi. 8, figs. 6, 7. 



Description. — Test free, in the adult with five visible chambers, 

 basal portion porcellanous, exterior rough, with agglutinated 

 particles, usually calcareous, aperture oval, with a bifid tooth. 



Length rarely more than 1 mm. 



Distribution. — There seems to be no available published records 

 from the North Pacific. I have had material definitely referable 

 to this species from but three stations — off Japan; Albatross, D4874, 

 in 66 fathoms and D4970 in 500 fathoms; and from Hongkong. 



