80 mOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



EEMARKS ON SOME SPECIES OF BULI3IULUS, Sect. DRYMJEUS, 

 AND DESCRIPTIONS OF NEW" SPECIES OF LAND -SHELLS 

 FROM BOLIVIA, ECUADOR, AND THE U.S. OF COLOMBIA. 



. By S. I. DA Costa, 



Head 15th April, 1898. 



PLATE VI. 



Among tlie large num'ber of specimens of BulimTilidse (principally 

 belonging to the section Dri/mceus), which, have reached me from the 

 United States of Colombia during the last ten years, certain forms 

 present so strong a resemblance one to another, that it becomes 

 extremely difficult to determine whether they constitute distinct 

 species, as held by some, or are merely varieties of one. Take, for 

 instance, Bulimulm felix, Pfr., the typical form of which is figured 

 in the Proc. Zool. Soc, 1861, t. xxxvii, fig. 2. 



An examination of a long series of these shells shows that althaugh 

 in many instances the form and colour-markings of the individuals 

 difi^er considerably, their general characters are the same, so we may 

 fairly conclude that these difierences are due to variation. There are 

 many other analogous instances. If an extended series of examples 

 of the following so-called species, B. mmrrinus, Eeeve, B. eonvexus, 

 Pfr., and B. phryne, Pfr., be examined, it will, I think, be manifest 

 that any attempt to separate them would only end in confusion. 



I propose, therefore, to reduce these three species to one, and to 

 adopt the specific name of ^^ murr inns'" for all, it being the first in 

 order of date, and given by Peeve, when describing the shell in the 

 "Conch. Icon." (1848), pi. xliii, figs. 373 a and"^. I would take 

 fig. a as the type, and class the others as varieties. 



On the other hand, there is in the British Museum a shell marked 

 as a variety of B. eonvexus, which is, however, so different in character 

 from that species that I describe the form as a new species, heading 

 therewith the following series of descriptions : — 



1. BULIMCTLUS (DRTMiEXJS) PLICATO-LIHATUS, U.sp. PI. VI, Pig. 1. 



Bid. testa ovato-fusiforme, basi compressa, carinata, umbilicata ; 

 anfractibus 7, convexis, suturis compressis, longitudinaliter rude 

 albo-plicatis, vel liratis, fulva, zonis angustis albis duabus cingulata, 

 apice nigro ; columella reflexa, apertura oblongo-ovale, inferne late 

 canaliculata, intus purpureo-fusca, bizonata, labro albo subexpanso et 

 reflexo. Long. 37, diam. 15-5 mm. ; apertura cum perist., longa 17, 

 lata 1 1 mm. 



JSah. — Bogota. 



2. BuLiMtJLUs (Dkym^us) Hidalgoi, n.sp. PI, VI, Pig, 2. 



Bui. testa ovato-fusiforme, compresse umbilicata, crassiuscula ; 

 anfractibus 7, convexis, Isevibus, vel sub leute lineis spiraliter incisis, 



