LITUOLIDA. 27 



4. Tr. squamata (proper), P. and J., has the shell divided throughout into lunate and 

 flattened chambers, several in a whorl, and regularly increasing with the progress of 

 growth. It much resembles those flatter varieties of Discorhina turbo which are interme- 

 diate to D. fflobidaris and D. rosacea, and it may easily be confounded with little, conical, 

 scale-like varieties of Valvdina triangularis, but the latter never have more than three 

 chambers in a whorl, and are more coarsely sandy. Tr. squamata lives both in the Arctic 

 Ocean and the Mediterranean at considerable depths (' Quart. Journ. Geol. Soc.,' vol. xvi, 

 p. 305; Carpenter's ' Introd.,' /. c, fig. 1 ; Parker and Jones, 'Phil. Trans.,' vol. civ, 

 p. 407, pi. 15, figs. 30, 31. It is well figured by Karrer (see above) from a fossil 

 specimen). 



5. T. squamata injlata, Montagu, sp., rotaliform, consisting of several (20) ventricose 

 chambers, increasing rapidly in size, few (5) showing beneath. (See Williamson's 'Mono- 

 graph Rec. Brit. For.,' 1857, p. 50, pi. 4, figs. 93, 94 ; ' Ann. N. H.,' 3rd ser., vol. iv, 

 p. 347; and Carpenter's 'Introd. Foram.,' p. 141, pi. 11, fig. 5.) Common in the 

 brackish estuarine pools on our north-east shore (see Brady, ' Nat. His. Trans. 

 Northumberland and Durham,' vol. i, p. 95) ; and found very rarely in deeper water on 

 the British Coast ; also living on the shores of the Mediterranean, and in the depths 

 of the Arctic and South Atlantic Oceans. It also occurs in a sub-fossil condition in the 

 clay underlying the peat of the Lincolnshire and Cambridgeshire fens. 



Subgenus — Webbina, D' Orbigny. 



General characters. — Shell adherent, comprising one or more pyriform, oval, or round 

 chambers, subarenaceous, smooth, dirty white, or of a deep rusty colour ; and, when 

 numerous, arranged in a single, irregular, moniliform Hue, often branched. 



1. Webbina hemisph.(Erica, nov. Plate IV, fig. 5. 



Characters. — Small, circular, subconical, monothalamous, like a low bell-tent, parasitic ; 

 recognisable only by its smooth but sandy shell, and general resemblance to the common 

 forms of Webbina irregularis. 



Diameter, ^ inch. 



One specimen onlv of this little parasitical Trochammina ( Webbina) irregularis, var. 

 hemisphtsrica, occurs among the Foraminifera from Sutton. 



