62 HENRY B. BRADY. 



Genus—CYCLAMMl^A, nov. 



{kvkXoq, a circle ; afx^oq, sand.) 



Cyclammina cancellata, n. sp. 



Nautiloid Lituola, Carpenter, 1875. ' The Microscope and its Revelations,' 



fifth ed., p. 530. fig. 274, a, b, c. 

 Cyclammina cancellata (Brady, M.S.), Norman, 1876. ' Proc. Roy. Soc. 



Lond.,' vol. XXV, p. 214. 

 Lituola canariemis, Carter, 1877. ' Ann. and Mag. Nat. Hist.,' ser. 4, vol. 

 xix, p. 203, pi. 13, figs. 26—29. 



Characters. — Test free, nautiloid, biconvex, depressed at 

 the umbilicus ; margin entire or slightly lobulate, angular 

 or somewhat rounded; composed of from two to three con- 

 volutions, each of which encloses completely, or almost com- 

 pletely, the previous ones. Segments numerous, ten to 

 sixteen in the last convolution ; narrow, bounded by sinuate, 

 slightly excavated lines radiating from the umbilicus. In- 

 terior of the chambers almost (sometimes entirely) filled with 

 finely arenaceous tubular growths. Surface smooth and 

 imperforate, except where abraded ; colour, various shades 

 of brown. Aperture normally a crescentic slit in the ter- 

 minal segment, close to its union with the previous convolu- 

 tion ; but, in addition, there are often a number of large 

 pores irregularly distributed on the face of the terminal 

 chamber. Size variable ; many specimens reach ^ inch (4 

 millim.) in diameter. 



The main structural features of this interesting type have 

 been already treated by Dr. Carpenter (loc. cit.); but as the 

 manuscript name appended to my specimens several years 

 ago has been employed by at least one author to distinguish 

 the species, it seems right that I should summarise its 

 zoological characters. This is the more necessary because 

 the organism has no place in the scheme which I have sug- 

 gested for the Lituoline genera. I cannot quite agree with 

 Dr. Carpenter in regarding it as a Lituola ; still less with 

 Mr. Carter in assigning it to Lituola canariensis, which 

 is a very distinct, minute, thin-shelled, Nonio7iina-\\\ie 

 species. As 1 believe it is one of the forms concerning which 

 we have more to expect from Dr. Carpenter's pen, it would 

 be unbecoming in me to enter into minute details respecting 

 its structure. 



Cyclamtnina cancellata is very widely distributed. In 



