4" 



1877.] 



SOUTH-AMERICAN HELICID^. 365 



cornea, margimbus leviter convecciuscuHs, apice flavescente con- 

 colon- anfr. 7, convexiusculi, lente accrescentes, sutura anauste 

 paUidasejuncti ; apertura vioc obliqua, ovalis, longitudinis totius 

 testce ^paulo superans ; jierisloma leiiue, margine dextro bre- 

 visstme (ms) expanso, columellari breviter dilatato et reflevo 

 Long. 21 mill., diam. 9 ; aperturae longit. 8|, diam. 5. 

 Hab. Zaruma, South Ecuador. 



This pretty delicate species is easily recognized by its style of 

 coloration. The transverse series of squarish spots, which are some- 

 what distant from each other, are very constant. They are not 

 equally remote from one another, but sometimes three or four snots 

 are quite close together and thus form a short almost continuous 

 transverse band ; this is particularly the case with the two basal 

 bands on the body-w!iorl. As the shell is so thin and semitrans- 

 parent, all the markings are visible within the aperture. The two 

 apical whorls under a strong lens are seen to be minutely granulated 

 as IS the case in many other species ' 



B. ziegleri of Pfeiffer var. /3 ?, Mon. Hel. ii. p. 1 75 ; and B. macu- 

 latus. Lea {i=B. maculatus, Reeve), have similar styles of markincr 



T> "^ O' 



iiuLiMus (LiosTRACus) FUscoBAsis. (Plate XXXIX. fig. G.) 

 Testa anguste perforata, etongato-conica, tenuis, semipellucida, 

 nitida, alba, fasciis transversis plus minusve interruptis fuscis 

 {m anfr. superioribus 2, in ultimo 3) ornata, ubtque minute 

 sptraliter striata; anf r actus 7-^, sensim accrescentes, convexius- 

 culi, ultimus fascia infima hand interrupta ad basim sita ; spira 

 elongata, apice parum acuto nigricante; apertura leviter obliqua 

 mtus alba fasciis pellucentibus, longit. totius f adcequans • 

 perist. tenue, vix expansum, margine columellari reflexo 

 Longit. 29 mill., diam. 12; apertura II longa, 6^ lata 

 Hob. " Tarapoto, Andes of Peru, Mr. Spruce'' (Mus. Cuming) 

 1 his species was labelled in Cuming's collection as B. lividus. Reeve 

 Un comparing the two specimens of it with the types of that species! 

 1 hnd certain characters which cannot be reconciled with Reeve's shell 

 The form and proportion of the whorls are different, also the leno-tli 

 of the spire is greater in the present species, and its black apex and 

 banding are good specific distinctions. The transverse bands in B 

 fuscobasis consist of elongate stripes only interrupted by white spaces 

 generally shorter than the stripes, whilst in B. lividus the bands take 

 more the form of quadrate spots widely separated. 



B. rectilinearis, Pfeiffer, is also allied to the present species • but 

 It is more sharply conical, shows but the faintest traces of spiral 

 striation, has not a black apex, is differently banded, and the colu- 

 mellar and umbilical characters are not similar. 



EXPLANATION OP PLATE XXXIX. 



Pig. 1. Bulimus ochrockeilus, p. 3G2. 



2. suhpellucidus, p. 364. 



3. flavidulus, p. 364. 



4. alholaUatus, p. 363. 



5. orthostoma, p. 364. 



Fig. 6. BuUmns fmcobasis, p. 365. 



7. aquatoriamis, p. 363. 



8. roseolahrimi, p. 362. 



9 a, 9i. Helix gealei, p. 361, 



