1890.] MARINE MOLLUSCA OF ST. HELENA. 277 



ultimo circiter 22, inferne ohsoletis) sulcisque duohus trans- 

 versis, circa partem inferiorem, instructi ; apex parvus, 

 fflobosus, involutus ; apertura irregulariter ovata, basi sub- 

 effusa ; colujnella vise torta, leviter rejlexa. 

 Lotu/it. Smillim., diam.fere 1 ; apertura 1 loncja, \ lata. 

 Besides the two spiral sulci which encircle the lower part of the 

 whorls hetween the riblets, some microscopic spiral strise are 

 observable at the upper part, and also upon the base of the body- 

 whorl. The little s;lassy nucleus is uncoiled and at a right angle to 

 the axis of the shell. 



CiNGULiNA ciRciNATA, A. Adams. 



Cingulina circinafa, A. Adams, Ann. & Mag. Nat. Hist. 1860, 

 vol. vi. p. 414 ; Angas, Proc. Zool. Soc. 1867, p. 201. 



JJab. North China, Japan, and Port Jackson. 



Several small specimens of this S|)ecies were obtained at St. 

 Helena. After a very careful examination under a microscope, I 

 cannot detect any difference whereby they can be distinguished from 

 this eastern form. The sculpture consists of three sul)equal s|)iral 

 ridges on each whorl, and a very fine thread borders the suture. 

 The nucleus is convex and sinistral, as in Mathilda, which I regard 

 as a subgenus of Cingulina. The finest specimen from Japan which 

 has been examined is 12 millim. in length, and consists of 

 thirteen normal whorls, whilst the largest St. Helena example is 

 only 5 millim. long and has eight volutions ; but had this sliell been 

 permitted to go on growing, it would, by the addition of .5 more 

 whorls, have attained a length fully as great as the Japanese example. 



CiNGULiNA (Mathilda) quadricarinata (Brocchi). 



Hab. Mediterranean, Bay of Biscay, Madeira. 



The distribution and references of this beautifnl species are given 

 by Jeffreys in his report on the Mollusca of the 'Porcupine' 

 Expedition (Proc. Zool. Soc. 1884, p. 364). He observes that the 

 sculpture " varies considerably, and this has, of course, given rise to 

 several synonyms, including Eglisia macandrecB of A. Adams. " 

 This latter species was described by H. (not A.) Adams ' and has 

 six spiral lirae and more numerous and more delicate longitudinal 

 raised lines of growth. Until further specimens are obtained which 

 may connect the two forms I prefer to keep them separate. 



The three specimens from St. Helena are small, the largest 

 measuring 13| millim. in length. They appear to be a trifle more 

 slender than the ' Porcupine ' specimens and that figured by Kobelt 

 (Jahrbiich. deutsch. Mai. Gesell. 1874, pi. xi. figs. 2, 2 a). The 

 sculpture, however, is precisely similar. 



The question has been raised by Mr. Watson (' Challenger ' Gas- 

 teropoda, p. 499), whether the genus Mathilda is the same as Cingtir- 

 Lina of Adams ; but I cannot adopt the conclusion at which he arrives 

 namely, *' either to suppress Cingulina altogether, or to retain it 



1 Proc. Zool. Soc. 1865, p. 753. 



