EASTERN PEOVINCE NORTHERN REGION SPECIES. 195 



It is a circumpoLir species, comuioii to tLe three contiueuts. In Europe 

 it is found iu Spain, Italy, and lllyria, as well as the extreme north- 

 ern countries. Pfeiffer also quotes it from Madeira. 



Animal: Head, back, and eye-peduncles blue-black, foot paler, 

 shorter than the shell ; tentacles short. (See Fig. 199, p. 193.) 



This little species, which is hardly larger than a grain of wheat, is 

 certainly identical with the European shell. It is distributed over a 

 vast expanse of country, and exists in immense numbers in certain 

 favorable localities. Its usual place of abode is under leaves and the 

 bark of decaying trees, in forest and groves. Its surface has a pecul- 

 iarly brilliant reflection, which excels that of any other of our shells ; 

 and hence it has been kuowji in France as "la brillante." There is a 

 slight sinuosity at the union of the peristome with the columella, ren- 

 dering the aperture a little effuse at this point, aud approximating 

 the shell to the genus AchaUna. This, and its other departures from 

 the typical BulimuU, have caused it, iu several instances, to receive a 

 generic distinction. Dr. Leach first indicated it as a separate genus, 

 under the name Ziia. 



My study of the membrane confirms my belief of the identity of the 

 species with the Euroi^ean form (see p. 193). I have carefully com- 

 pared the dentition of our form with that described and figured by 

 Lehmann (Lebenden Schnecken, 132, Plate XIII, Fig 44), and find 

 them to agree. I must therefore disagree with the decision of Morse 

 (Journ. Portl. Soc). I have also examined the genitalia of our species, 

 and found it to agree with Lehmann's figure {I. c), especially in th6 ex- 

 istence of the very peculiar flagellum to the penis sac. This, however, 

 cannot be considered as a most reliable specific character peculiar to 

 this species, as it exists also iu Cceeilianella acicula. 



Lingual membrane : see p. 193. 



I am very confident of the i^resence of well-developed side cusjis to 

 the central teeth, which Morse [l. c.) does not figure, though they are 

 figured by Thomson (Ann. Mag. l^T. H., VII, Plate IV, Fig. 8). They 

 appear to me also to bear the short cutting points which I have fig 

 ured. 



The genitalia are peculiar. The penis sac is short, stout, with the re- 

 tractor muscle near its base ; the vas deferens enters at its apex, and 

 near its entrance into the vagina it receives a curious flagellate append- 

 age, swollen below, narrow above, as long as the whole system, with 

 a largo, narrowly ovate bulb at its end; the genital bladder is large, 

 ovate, on a long, narrow duct. 



