THE FAMILY CHEILOSTOMELLID^ 183 



entirely, that preceding it ; aperture terminal, alter- 

 nately at each end of the test. Eecent. 



Example. — S. pelluclda, Brady, ' Journ. E. Micr. 

 Soc' 1890, p. 570, figs. 60, 1 a-c, 2 ; Wright, 'Proc. 

 E. Irish Acad.' ser. 3, vol. i. 1891, p. 476, pi. xx. fig. 5 ; 

 Millett, ' Journ. E. Micr. Soc' 1901, p. 3, pi. i. fig. 4. 



The test of this species is oval and depressed, 

 with the two sides unequally convex, or sometimes 

 almost plano-convex. The aboral end is rounded, 

 the oral end somewhat drawn out. The peripheral 

 edge is acute or subcarinate, and in large specimens 

 serrate. The shell-wall is thin and transparent, 

 smooth and finely perforate. Aperture terminal, slit- 

 like with a thickened border. 



The original specimens of the above form were 

 obtained by Mr. Harris, of Cardiff, from Captain 

 Seabrook, who dredged the material in the Java Seas 

 off Cebu at 120 fathoms. Since then it has been 

 obtained off Bermudas, 435 fathoms, and from the 

 Malay Archipelago. (Plate 10, fig. C.) 



Genus Allomorpliiuay Eeuss. 



Segments alternating at three sides, so as to leave 

 portions of two, in addition to the final one, exposed. 

 Up. Cretaceous. lieceiit. 



Example. — A. trigona, Eeuss, ' Denkschr. k. Ak. 

 Wiss. Wien,' vol. i. 1850, p. 380, pi. xlviii. figs. 

 14 a-e. 



Most, if not all, of the various so-called species of 

 this genus may possibly belong to the one form 

 named above. It occurs as a fossil in the Glialk Marl 



