414 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Planispirina sphaera — Material examined. 



Genus VERTEBRALINA d'Orbigny, 1826. 



VERTEBRALINA STRIATA d'Orbigny. 



Vertebralina Striata d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 283, No. 1; Modeles, 

 1826, No. 81.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 187, 

 pi. 12, figs. 14-16.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 38, 

 pi. 22, figs. 3, 4. 



This is a species characteristic of coral-reef conditions. Millett 

 did not find it well developed in his material from the Malay Archi- 

 pelago, but I found it fairly common in material from about the 

 Hawaiian Islands. 



The only Philippine record is a single specimen in shore material 

 from Tataan Island. It is typical. 



Vertebralina striata — Material examined. 



VERTEBRALINA STRIATA d'Orbigny, var. RETICULOSA, new variety. 



Plate 97, fig. 4. 



Description. — Variety differing from the typical in the ornamenta- 

 tion of the last few chambei-s, which, instead of being "the invariable 

 surface ornament of deUcate parallel striae," as in the typical, has 

 certain of the lines stronger than others in usually alternating areas, 

 giving a very peculiar reticulose appearance. 



This variety occurs in the Mediterranean, where it is noted by Side- 

 bottom from Delos " * * * some of them boldly striated and 

 pitted as in V. insignis." ^^ I am grateful to Mr. Sidebottom for Delos 

 material in which this variety occurs. Heron-Allen and Earland •'* 

 also note under V. striata, "at Stns. 10 and ? B specimens with a 

 reticulate instead of a striate surface were observed." The variety, 

 therefore, has a wide distribution in warm waters. 



The type (U.S.N.M. No. 13591) is from Albatross station D5160, 

 Sulu Archipelago, Tawi Tawi Group, 12 fathoms (22 meters). This is 

 figured here and, while not so definitely reticulose as the Mediter- 

 ranean specimens, has carried the peculiar ornamentation still further 

 in its development. 



*i Mem. Proc. Manchester Lit. and Philos. Soc, vol. 48, 1904, No. 5, p. 18. 

 « Trans. Zool. Soc. London, vol. 20, 1915, p. 587. 



