HOLOSPIRA. 281 
diameter of the whole shell and in the size of the aperture they are alike, All are 
probably from Central Mexico. 
The figure in Reeve’s ‘Conchologia Iconica,’ Cylindrella, t. 8. fig. 72, does not agree 
with my specimens nor with the original figure ®; it shows much more oblique coste 
and a more protracted aperture. 
12. Holospira fusca, sp. n. (Tab. XVI. fige. 19-24.) 
Testa latiuscule umbilicata, fusiformi-cylindrica, arctispira, tenuis, levissime oblique striatula, lilaceo-fusca ; 
anfr. 19, primi duo subglobosi, leves, pallide cornei (rarius nigrescentes), sequentes 7 paulo celerius cres- 
centes conulum elevatum formantes, ulteriores paululum decrescentes, convexiusculi, sutura modice 
impressa, ultimus basi inflate rotundatus, antice subascendens, brevissime productus; apertura verticalis, 
subcircularis, persistomate undique crassiusculo, breviter expanso, albo, margine supero transverso, angulo 
externo distincto, marginibus ceteris arcuatis. 
Long. 16, diam. anfr. penult. 4, diam. max. 5, apert. long. 34, lat. 34 millim. 
i 1 
9 143, ” 9 3, 9 33, 2” 23, ” 23 ” 
1 2 
” 12, ” ” 33, ” 35, ” 23, ” 23 ” 
1 
2 12, ” ” 3, ” 3s, ” 23, ” 23 ” 
Hab. S.W. Mexico: Omilteme, in the State of Guerrero (H. H. Smith). 
Somewhat similar to H. goniostoma, but differing from it in the form of the 
umbilicus, the want of costule, and also in the number of whorls. The general form 
of the shell, as well as the width of the umbilicus, is somewhat variable, as may be 
seen from our figures 19-23; for the young state, see fig. 24. 
This and the following species are the only dark-coloured forms belonging to 
Holospira, s. sty. 
13. Holospira berendti. 
Cylindrella berendti, Pfr. Malak. Blatt. xiii, p. 87 (1866)’; Monogr. Helic. Vivent. vi. p. 387° ; 
Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 409°. 
Epirobia berendti, Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 86, t. 13. fig. 1 (radula), 
and t. 14. fig. 18 (columellar axis) *. 
Hab. E. Mexico: Toxpan *, on the slope of the mountain Matlaquiahuitl, near Cordova, 
in the State of Vera Cruz (Berendt + *). 
Var. albida. 
Cylindrella berendti, var. B. albida, Fisch. & Crosse, loc. cit. p. 409 ° 
Epirobia berendti, Strebel, loc. cit. p. 86, t. 3. fig. 7°. 
Hab. S.E. Mexico: Chiapas (Bland >, Berendt°). 
The radula of this species agrees very nearly with that of J. pfeifferi, figured by 
Fischer and Crosse, but the vertical sculpture of «the columellar axis is as in the 
subgenus Epirobia ; the species therefore is intermediate between the two divisions. 
* Sometimes written Tuxpan. 
BIOL, CENTR.-AMER., Terr. and Fluviat. Mollusca, December 1897. 36 
