﻿IO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 



PHENACOTAXUS TUBULATUS Morelet 



Bulimus tubulatus Morelet, Journ. de Conchyl., vol. 8, i860, p. 375; Ser. 



Conch., vol. 3, p. 204, pi. 11, f. 4, 1863. 

 Bulimulus (Bostryx, Ataxus) tubulatus Pilsbry, Man. Conch., vol. 10, p. 132, 



pi. 44, f. 95, 96. Mar. 1896. 



Valley of Andahuaylas, Peru (Angrand) ; Urubamba Valley, at 

 9000 feet elevation (Rolle). 



In this species the lamella begins gradually and reaches laterally 

 only about half way across the whorl. It is more slender and less 

 thickened at the distal margin than in P. infundibulum and the undu- 

 lations in the width as it ascends are less marked, though quite 

 evident. It does not ascend the axis as rapidly as in the preceding 

 species. Beginning below the middle of the axial wall, in the next 

 preceding whorl it is very slightly above the middle and becomes 

 obsolete in the next preceding whorl. There is, however, some dif- 

 ference between the development of the lamina in different specimens. 

 U. S. N. Mus., No. 1 10072. 



PHENACOTAXUS (ATAXELLUS) SPICULATUS Mor. var. PECTINATUS 



Dall, nov. 



Bulimus spiculatus Morelet, Journ. de Conchyl. i860, p. 375 ; Ser. Conchyl., 



vol. 3, p. 203, pi. 11, f. 3, 1863. 

 Bulimulus (Bostryx, Peronaus) spiculatus Pilsbry, Man. Conch., vol. 10, p. 



144, pi. 45, f. 29, 1896. 



Above Ollantaytambo, Peru, at 10,000 feet elevation, Yale Expedi- 

 tion. Valley of. Ollantaytambo, Angrand, in Morelet. U. S. N. Mus., 

 No. 250263. 



The shell externally agrees in form and character of sculpture in 

 the main with Morelet's figure. Dr. Bingham's specimens differ by 

 being perfectly white instead of brown streaked, and, while B. spicu- 

 latus is stated to be without spiral sculpture, the present variety is 

 sharply, spirally striated, through the striae are not equally visible 

 over the whole shell. The dimensions are: Height, 21.5 ; length of 

 aperture, 5.0; max. diameter, 4.0 mm. The axis of the shell is en- 

 tirely imperforate; within the first half of the last whorl it becomes 

 very slender, thread-like, and slightly gyrate. The lamina begins as 

 a short, subtriangular, flexuous, and recurved plate ; ascending the 

 axis as a low lamina, has a small triangular expansion in the second 

 preceding whorl, and becomes obsolescent in the whorl above. It also 

 approaches nearer to the roof of the whorl as it ascends. 



The next species, though having a close general resemblance to 

 spiculatus except in its smoother surface, has the axis quite simple 

 and normal, with no laminose developments whatever. 



