NOTES ON RETICULARIAN RHIZOPODA. 2^91 



Gemis—UASTlGEUmA, Wynlle Thomson. 

 Hastigerina pelagica, {cVOrhigny). 



Nonionina pehigica, d'Orbigny, 1839. ' Forani. Amer, Merid.,' p. 27, 



pi. 3, figs. 13, 14 

 Globigerina pelaoica, V&i-ker and Jones, 1865. 'Phil. Trans.,' vol. civ, 



p. 336. 

 Hastigerina Ilurrayana, Wy. Thorn., 1876. 'Proc. Hoy. Soc.,' vol. xxiv, 



p. 53i, pis. 22, 23. 



An organism very closely allied to Glohigerina, with which 

 it corresponds also in its pelagic habit. It is not easy to 

 find zoological characters to separate the two genera, but the 

 nautiloid symmetry of the test of Hastigerina, its extreme 

 tenuity, the embracing contour of the successive convolutions 

 (the constituent chambers of which spring from the umbilicus 

 on either side), and the large opening on the face of the 

 ultimate segment that serves as the aperture, are perhaps its 

 distinctive peculiarities. The empty shells are seldom found 

 amongst dredged sand or ooze, and when they do occur they 

 are invariably much broken, owing to the delicacy of the 

 calcareous walls. When living the test is armed with long 

 spines, but the bases of these alone are left in the dead shells 

 found at the bottom. 



Under the name Nonionina pelagica, d'Orbigny describes 

 and figures what is manifestly the present species (Joe. cit.), 

 and appends the following remark : — " Cette espece est une 

 rare exception parmi les Foraminiferes essentiellement 

 cotiers, puisque nous I'avons prise en pleine mer, a une 

 grande distance des cotes du Perou, dans I'ocean Pacifique, 

 par 20° de latitude sud et 89° de longitude ouest de Paris, 

 ou elle nous a paru tres rare." His figure represents a shell 

 somewhat flatter than most of the "Challenger" specimens, 

 with the sutures and umbilicus rather more depressed, and 

 if these characters should be found sufficient to distinguish 

 the two, Sir Wyville Thomson's specific or varietal name 

 might be retained for the more spheroidal form. 



Gewws— C ANDEINA, cV Orhigmj. 



Candeina nitida, d' Orhigmj. 



Amongst the Foraminifera from various habitats figured by 

 d'Orbigny in the final plate of his " Vienna Basin " mono- 

 graph,^ are several that have been a source of difficulty to 

 subsequent Rhizopodists, perhaps none more so than Can- 

 1 ' For. Foss. Vien.' p. 593, pi. 21, fig. 28. 



