/ 



CCECILIANKLLA. 189 



The {:jonit:ilia arc poruliar : tlie penis sac is short, stout, with the retractor 

 nniscK' near its base ; the vas deferens (Miters at its apex, and n<*ar its entrance 

 into the va<;ina it receives a curious llaj^ellatc ai){)cnda{^e, swollen below, nar- 

 row above, as lonjjj as the whole system, with a lar;^(i narrowly ovate bulb at 

 its end ; the genital bladder is large, ovate, on a long, narrow duct. 



CCBCILIANELLA, BoURO. 



Animal as in Fernssacia ((\. v.), Blind. 



Shell elongate, imperforate, polished, vitreous, white, apex rather obtuse ; 

 aperture equalling about one half the shell's length, Fig 95. 



oblong ; columella subarcuate, distinctly truncated ; 

 peristome simple, acute. 



Within our limits it has only been accidentally in- 

 troduced. It is common amon": the West Indian . . , , ^, 



•^ Animal of (.. acicula. 



Islands, in Europe, South America, etc. (Reeve.) 



I have not been able to examine the jaw or dentition of C. acicula, the only 

 species found in our limits. They are both well known, liowever, from the 

 descriptions and figures of Moquin-Tandon, Thomson, Sordelli,^ and Lehmann. 

 The jaw is low, wide, arcuate, with delicate vertical striae. The lingual mem- 

 brane (Lehmann, Lebenden Schnecken, p. 128, PL XIII. Fig. 43) has 120 rows 

 of 11 — 1 — 11 teeth each. The centrals are small, tricuspid (Sordelli), the later- 

 als, 6 in number, are larger, and have a more highly developed reflection, and 

 are also distinctly tricuspid. Marginals subquadrate, with a broad reflection, 

 bearing delicate denticles. 



I have examined the jaw and lingual dentition of C. Gundlachi, which for 

 the sake of comparison, I repeat here : — 



Jaw low, wide, slightly arcuate, ends attenuated ; whole surface covered 

 with about 22 crowded, broad, flat ribs, denticulating either margin. 



Lingual membrane long and narrow. Teeth 18 — 1 — 18, with 4 perfect later- 

 als. Centrals with their base of attachment long, narrow, their reflected portion 

 about one half the length of the base of attachment, tricuspid ; the middle cusp 

 stout, with a short blunt cutting point ; side cusps subobsolete, but with small 

 distinct cutting points. Lateral teeth with their base of attachment subquadrate, 

 much longer, and very much broader than that of the centrals, the reflected 

 portion short, stout, tricuspid, the middle cusp very stout and long, reaching 

 the lower edge of the base of attachment, beyond which projects the short, 

 stout cutting point ; side cusps subobsolete, but bearing distinct, though small 

 cutting points. There are 4 perfect laterals, the fifth tooth being a transition 

 to the marginals, by the base of attachnient being lower, wider, not exceeding 

 the reflected portion, with one inner large cusp bearing one outer large cuttino" 



1 Sordelli ( Atti della Soc. Italiana di Sc. Nat., XIII., fasc. 1, p. 50, PI. I. Fig. 25) describes 

 the ribs to be not straight, but curving, witli a median point projecting toward the end of 

 the jaw, so that each rib resembles quite exactly the sign called " brace " by printers. 



