Manchester Memoirs, Vol. I. (1906), No. 5. ii 



Mr. Wright's form, and the test is also inequilateral. The 

 keel however is confined to the aboral end of the test and 

 is well developed. Six specimens found. Very rare. 



Lagena irregularis, n. sp. (PI. 2, fig. 8). 



One face of the test is bent back in the centre at 

 about an angle of forty five, the opposite side being 

 highly convex ; periphery bi-carinate. Aperture, a small 

 slit situated between the two edges of the keels. Entoso- 

 lenian. 



This curious form is difficult both to describe and to 

 draw quite satisfactorily. It is very minute, and reference 

 to the figures will best explain its peculiarities. The 

 keels are well developed at the oral end, whilst at the 

 aboral they are not so wide, but the bicarinate condition 

 is more pronounced. The space between the keels, small 

 as it is, is partially filled with debris, or shell-growth, and 

 this increases the difficulty of examination. The internal 

 tube in all cases runs along the centre of the back until 

 it nearly reaches the other end, where it turns to one side. 

 The orifice is a small slit, apparently situated between the 

 edges of the keels as shown in the drawings, but it is very 

 difficult to make out. 



It has been thought that this form might be a 

 distorted or wild-growing example of L. marginata, van 

 inaequilateralis, Wright, but the twelve specimens found 

 are all alike. The mouth of the test is not protruded as 

 in Mr. Wright's figures of his species, and as in the Delos 

 specimens of the same form, in addition to which the keel 

 is double. Rare. 



*Lagena lagenoides, Williamson, sp. 

 Entosolenia marginata, var. lagenoides, Williamson 

 ('58), p. II, pi. I, figs. 25, 26. 



