Helix Jamaicensis, etc. 153 



Dr. van Rygersma informs me that he had an opportu- 

 nity of examining the animal and could discover no eyes. 

 He says it has "four tentacles, of which the lower ones are 

 very small, scarcely perceptible, the upper thick, cone elon- 

 gated, without any black spot, indicating eyes. The animal 

 citron yellow in color; the foot long and narrow." 



v. Martens (Die Heliceen, ed. 2) has A. Giuitttachi, Pfr. 

 in Acicula, subgenus of Qionella; he mentions that Acicula 

 is without eyes, but gives no other particulars of the animal. 



Arango (Repertorio, I, 128) assigns the species under con- 

 sideration to the genus Coecilianella, Bourguignat. While 

 for the purposes of the present note, I have adopted Geostil- 

 bia, I have much doubt as the necessity for its establishment. 



Mr. W. G. Binney, to whom I sent the specimens received 

 from St. Martins, has obliged me with the following particu- 

 lars : 



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 

 laterals. Centrals with their base of attachment long, narrow, their re- 

 flected portion about one-half the length of the base of attachment, tricus- 

 pid; 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, tri- 

 cuspid, the middle cusp very stout and long, reaching the lower edge of 

 the base of attachment, beyond which projects the short, stout cutting 

 poiut; side cusps subobsolete, but bearing distinct, though small cutting- 

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

 to the marginals, by the base of attachment being lower, wider, not ex- 

 ceeding the reflected portion, with one inner large cusp bearing one outer 

 large cutting point representing the outer cutting point of the first four 

 lateral teeth and one inner, still larger, cutting point, representing the 

 middle cutting point of the first four laterals, and one smaller, outer cusp 

 bearing one small, sharp, bifid, cutting point, representing the outer side 

 cutting point of the first four laterals. The sixth tooth has the largest 

 cutting poiut bifid. The balance of the teeth are true marginals. They 

 are very low, wide, with two low, wide cusps, bearing each several irreg- 

 ular, blunt cutting points. 

 May, 1875. 11 Ann. Lyc. Nat. Hist., Vol. xi. 



