Report on Foraminifera. By V. W. Millett. 621 



describe, two examples whose affinities, however, seem to be rather 

 with L. semimarginata. 



Brady speaks of it as essentially a deep-water species. 



L. seminiformis with the single keel is very rare in the Malay 

 Archipelago ; but the form with the double keel is not infrequent, and 

 passes insensibly into L. formosa. 



To its fossil localities may be added the Tertiary beds of St. Erth. 

 and the Coralline Crasr of Broom Hill. 



o 



Lagena marginato-perforata Seguenza, plate XIV. fig. 4. 



Lagena marginato-perforata Seguenza, 1880, Atti R. Accad. 

 Lincei, ser. 3, vol. vi. p 382, pi. xvii. fig. 34. L. castrensis (?) 

 (Schwager) Brady, 1884, Chall. liept., p. 485, pi. lx. fig. 3. 



The compressed Lagense having circular markings of various 

 descriptions on their opposite faces are very abundant in the Malay 

 Archipelago, and all the named varieties are represented. That with 

 a single keel is the variety of L. marginata named by Seguenza 

 L. marginato-perforata ; the double keeled form, which corresponds 

 to L. hicarinata, is the Fissurina punctata of Seguenza ; whilst the 

 triple-keeled, which is a variety of L. Orhigmjana, has received from 

 Schwager the name L. castrensis, from Schlumberger the name L. 

 variolata, and has been named by Burrows and Holland L. lacunata. 



Although the forms which have been accepted and named are 

 thus acknowledged, it must be urged, that even if it were zoologically 

 correct to receive these markings as distinctive characters, yet in 

 practice it would be highly inconvenient, as each kind of ornament, 

 whether a dot, pit, bead, vesicle, or perforation, would have to be con- 

 sidered separately, in connection not only with the number of the 

 keels, but with the position of the aperture, whether sessile or 

 pedunculate, and with the size and plan of arrangement of the 

 markings ; thus leading to the creation of varieties in a geometrical 

 ratio not pleasant to contemplate. 



The forms named occur in abundance all over the Malay Archi- 

 pelago, that with the single keel being the most numerous. 



Lagena Elcockiana sp. n., plate XIV. figs. 5, 0. 



Test oval or pyriform, compressed ; periphery carinate or bordered. 

 One face curved from the oral to the aboral extremity ; the opposite 

 face composed of two plane surfaces, which, projecting from the lateral 

 margins, meet at the centre and form a straight ridge which extends 

 from the aperture to the base of the shell. Aperture a curved slit on 

 one side of a projecting crescent-shaped process, with recurved ends, 

 which overlaps the face bearing the central ridge. Length 0*1(5 mm. 



The shell is very delicate and translucent. The central ridge may- 

 be either acute or carinate, and sometimes there are a few bars across 

 the aperture. 



