SYKES : 5I0LLUSCA OF THE I'OECUPIJS^E EXPEDITION. o7 



Distribution. — Bay of Naples (Tiberi) ; Palermo and St. Vito 

 (Monterosato). Tertiaiy of Europe. 



Lest there be any mistake in the form discussed, it is now figured 

 (PI. Ill, Fig. 3). Authors in general have referred this form to 

 the briefly diagnosed and untigured Bulla striatula of Forbes. 

 Fortunately, guided by a note of Jeffreys, I have succeeded in finding 

 a specimen presented by Forbes himself to the British Museum. 

 Jeffreys notes that Bulla striatula is probably a synonym of Retusa 

 mamillata (Phil.); this may be so, but in the single specimen, 

 which is in very bad condition, the protoconch appears rather 

 to be sunk. Next, there has been a diiflculty as to whether 

 C. Moernesi be not the same as the Bulla pyramidata of A. Adams 

 from China seas ; the type of the latter is in the British Museum, 

 and the two species are very closely related, but C. pyramidata is 

 a trifle more pyramidal, i.e. the relative proportions taken near the 

 base and apex are different, and the last whorl is slightly more 

 inflated. Further material of the latter species is needed. 



CiLiCHNA Jeffkeysi (Weinkauff). 



Bulla [Cylichia) Jejfrey si, Weinkauff: Journ. de Conchyl., voL xiv, 



p. 288 ; Conch, des Mittelmeeres, vol. ii, p. 199. 

 Bulla ovulata, Jeffreys: Ann. Nat. Hist., ser. ii, vol. xvii, p. 188, 

 pi. ii, figs. 18, 19 [jiec Brocchi]. 

 "Porcupine" Expedition, 1870, Stations Benzert Road ; Adventure 

 Bank ; Gulf of Tunis. 



Distribution. — Various localities in the Mediterranean. Pliocene 

 of South Europe. 



Cylichna obscura, n.sp. PI. Ill, Figs. 9, 9a. 



Shell cjdindrically ovate, thin, shining, smooth, with faint traces 

 of lines of growth ; aperture narrow above, wide below ; columella 

 rather straight, but slightly inclined to the left, and a little thickened, 

 leaving a small umbilical chink visible. Apex deeply sunk, with 

 a nari-ow, funnel-shaped, obtusely edged umbilicus. Alt. 2 "5, diam. 

 max. 1'2 mm. 



" Porcupine" Expedition, 1870, Station 3. 



Only two specimens, one dead and one live. It appears to be akin 

 to C. ohesiuscula, Bruguiere, but is more slender and the columella is 

 straighter. Also relatetl to C. ovata, Jeff., but that shell is somewhat 

 pyramidal in shape, whilst this is rather Bulloid. 



Cyliohna ovata, Jeffreys. 



Cylichna ovata, Jeffreys: Proc. Boy. Soc, vol. xix, p. 1&6; Rep. Brit. 

 Assoc, 1880, p. 387; Ann. Nat. Hist., ser. v, vol. x, p. 34; 

 "Watson, Challenger Rep., Gastropoda, p. 664, pi. xlix, 

 fig. 9 ; Dautzenberg, Camp. Scient. Albert I^r, fasc. i, p. 23 ; 

 Dautzenberg & Fischer, Mem. Soc. Zool. France, vol. ix, 

 p. 403 ; Locard, Exped. Scient, Trav. Talisman, vol. i, 

 p. 69 ; Smith, Ann. Nat. Hist., ser. vi, vol. iv, p. 422. 



