754 Transact ions of the Society. 



Cristellaria italica (DeTrance), plate XV. fig. 23a, b, XVI. 

 4a, b. — Saracenaria italica Defiance, 1824, Diet. Sci. Nat., xxxii. 

 p. 177 ; xlvii. p. 344; Atlas Conchyl., plate xiii. fig. 6. — Elongate, 

 erect, and triangular, with chambers which rapidly widen. Fig. 4, 

 plate XVI. is a variety of this form. Brown clay. 



Oristellaria italica (Defrance) var. spimilosa nov., plate XV. 

 fig. 24a, b ; 25a-c. — In 1863, Reuss figured in his ' Foram. 

 Septarien-Thones Offenbach,' Sitz. k. Ak. Wiss. Wien, xlviii. 

 pp. 49-53, plate iv. figs. 44-9, 51-4, and plate v. figs. 60 and 61, 

 several varieties of Cristellarise, all referable to C. italica. Three 

 of these (51, 52, 60) are very closely similar to our specimens, the 

 difference being chiefly in the ornamentation ; and on this account 

 we propose to call them var. spinulosa. Similar unornamented 

 figures occur in Von Schlicht, ■ Foram. Septarienthones Pietzpuhl.' 

 4to, Berlin, 1870, plate XIII. figs. 19, 20, 23, 24, 25. One of our 

 figures shows a two-chambered form, the other a 4- or 5-chambered, 

 the first two being indistinct ; both are more or less covered with 

 short spines, and the larger of the two is limbate between its 

 chambers. The two figured specimens are all that are known ; 

 from the brown clay. 



Cristellaria rotnlata (Lamarck) var., plate XVI. fig. 3. 

 Lenticulites rotulata Lamarck, 1804, Ann. du Museum, v. p. 188, 

 No. 3 ; Tableau Encycl. et Meth., plate cccclxvi. fig. 5. — A poor 

 and starved example. The true and well-developed form can be 

 seen in many papers, especially in Vanden Broeck's memoir, 

 Ann. Soc. Beige Microsc, ii. 1876, plate hi. fig. 1. Black clay, 

 Piccadilly ; also at Chelsea. 



Cristellaria rotulata (Lamarck) var. flexuosa nov., plate XV. 

 fig. 26a, b. — We have not previously met with this form. It appears 

 to be a variety of C. rotulata, and may be described as follows : — 

 A wax-like test, greenish-grey in colour, with the central boss 

 much whiter than the rest of the shell. Keel obsolete or almost 

 absent, merely defined by tint ; no external trace of septation, the 

 whole surface being uniformly smooth. Strongly waved or flexed 

 in the line of growth, giving the shell a contorted appearance. 

 One specimen ; black clay. 



Cristellaria inomata d'Orbigny, plate XV. fig. 27a, b. Robulina 

 inornata d'Orbigny, 1846, For. Tert. Vienne, p. 102, plate iv. 

 figs. 25, 26. — Smooth, the septal planes showing through the shell 

 as darker lines. Bare ; from the black clay. 



Cristellaria cultrata (Montfort), plate XV. fig. 28a, b. Robuhis 

 cultratus Montfort, 1808, Conchyl. Syst., i. p. 214, 54 e genre. — 

 A very common but distinct form, being keeled. The central boss 

 passes from circular to polygonal, as shown in our figure. This 

 is a rather fine example compared with the others from our wash- 

 ings, and there is apparently a chamber missing, which we have 



