218 On the Nomenclature of the Foraminifera. 



Malac. p. 382, pi. 5. f. 1. This is De Blainville's name for 

 Lamarck's Spirolina cylindracea (which see). 



133. Textularia Sagittula, Defr. 1824. Diet, xxxii. p. 177, 

 liii. p. 344; Atlas, Conch, pi. 13. f. 5 ; Bl. Malac. p. 370, pi. 5. 

 f. 5. " This is Soldani's Polymorphum Sagittula, Testae, vol. i. 

 part 2. p. 120, pi. 133, vas 260. f. o. It occurs fossil near 

 Sienna and Castel d'Arquato, and lives in the Mediterranean. 

 We have only this one species; but, in his Tabl. Meth. Cephal., 

 D'Orbigny enumerates twenty-six other species, of which most 

 are fossil.^' 



This is a common Textularia — indeed, the most common 

 variety. It is not the type of the genus, however, which is best 

 typified by T. agglutinans, D'Orb., a more inflated form, and 

 generally of a larger size. T. gibbosa, D'Orb., attains still larger 

 proportions, being a more exaggerated variety. 



The figure given by Blainville and Defrance (Atlas, Zooph. 

 pi. 13. fig. 5) difiers somewhat from that in Soldani's book. 

 The specimen was of smaller size, flatter, the earlier chambers 

 smaller, and the newest chambers more contracted — the shell 

 well representing an unbarbed arrow-head in miniature. Sol- 

 dani's figure seems to indicate the presence of a third series of 

 chambers on one of the sides ; but we think that this feature 

 was probably only a low ridge arising from an irregular form of 

 the chambers on the unattached surface of the shell, and not 

 really due to an intercalated series of chambers. The specimen 

 figured by Soldani was of rather large size ; and we have met 

 with several in the Mediterranean of equal magnitude : they 

 take on the more regularly sagittate form in their smaller con- 

 dition ; when largely developed, they often approximate to T, 

 agglutinans, D'Orb. 



T. Sagittula is very common, ranging from shallow water to 

 a depth of 150 fathoms. The subgroup typified by Defrance's 

 and Soldani's figures, above referred to, comprises a large and 

 variable series of forms, recent and fossil, which have been 

 abundantly supplied with names. T. Sagittula and T. aggluti- 

 nans are the commonest of all the Textularia ; they are world- 

 wide, and go far back in time. Of the Textularia on our own 

 coasts they are the most abundant. In Prof. Williamson's 

 Monograph, figs. 158 & 159 aflbrd, we think, a good example 

 of the small T. Sagittula (although that author refers it to T. 

 cuneiformis, D'Orb., which appears to us to be a distinct va- 

 riety). T. Sagittula and its larger allies become sandy in their 

 adult state ; smaller varieties of T. agglutinans (the type), such 

 as T. pygmaa, D'Orb. {T. aciculata, D'Orb.), remain hyahne and 

 poriferous. See also Ann. Nat. Hist. ser. 3. xi. p. 91 &c., and 

 Carpenter's ' Introduction,' p. 189 &c. 



