1890.] MARINE MOLLUSCA OF ST. HELENA. 297 



Cylichna cylindracea (Pennant). 



Sab. This species occurs throughout " the whole north-east 

 Atlantic, from the Lofotens to the Mediterranean, at the Canaries 

 and Mogador " ( Watson). It was also obtained by the ' Challenger ' 

 at Ascension Island and Tristan da Cunha, and the British Museum 

 possesses specimens collected at Whydah on the west coast of 

 Africa. Several of the specimens belong to the variety "linearis " 

 (Jeffreys, Brit. Conch, vol. iv. p. 41()). 



Cylichna atlantica. (Plate XXIV. fig. 10.) 



Testa ovato-cylindracea, tenuis, pelhicido-alba, nifens, rimata, 

 ad verticem angitste jierforata, transversim {praesertim supra 

 et infra) tenuissime striata; apertura sup erne angustissiina, 

 antice leviter dilatata ; Jahrum temie, supra verticem anfr. 

 ultimi productum ; margo columellaris callo tenui reflexo 

 indutus, inferne obsolete subtruncatum. 

 Longit. 5^ millii)i., diam. 2k. 



This species has more curved outlines than C. cglindracea, has a 

 perforate apex, and an umbilical chink. The thin columellar cal- 

 losity extends up the whorl, and joins the upper extremity of the 

 outer lip. 



Cylichna bidentata (d'Orbigny.) 



Bulla bidentata, d'Orbigny, Sagra's Hist. Cuba, Moll. vol. i. 

 p. 125, pi. 4. figs. 13-16. 



Hab. West Indies. 



The specimens from St. Helena agree in all respects with this 

 species, except that the lower columellar tooth, or fold, is less deve- 

 loped. Similar variation occasionally occurs in West-Indian 

 examples. 



Tornatina recta (d'Orbigny). 



Bulla recta, d'Orbignv, Sagra's Hist. Cuba, vol. i. p. 131, 

 pi. 4 bis. figs. 17-20. 



Hab. West Indies. , 



A single specimen is all I have seen from St. Helena. It has the 

 spire rather less elevated than d'Orbiguy's type. 



Philine quadrata, Searles Wood. 



Hab. North Britain, Norway, Greenland, Massachusetts Bay, 

 Azores. 



A single specimen was dredged in 50-80 fathoms. It has the 

 transverse sculpture rather finer than usual. 



Haminea hydatis (Linne). 



Hab. British Coast, Mediterranean, &c.. 



None of the specimens from St. Helena exceed 10 millim. iu 

 length ; they therefore are probably not full-grown. 



