MICROCERAMUS. 171 



Macroceramus maculatus Wright mss., PFR., Malak. BL, 

 xii, 1865, p. 119; var. b, xiii, 1866, p. 59; Novit. Conch., p. 

 404, pi. 93, f. 19-21; Monogr., vi, p. 349. ARANGO, Fauna, 

 p. 83. 



This species stands nearest M . elegans, but is easily separ- 

 able by the more convex whorls, the rather sharp keel and the 

 form of the mouth (P/r.). 



A variety taken copiously on the summit of Guajaybon is 

 more solid, gray-whitish irregularly marked with brown. I 

 have not seen specimens certainly referable to this species. 



20. M. LATUS ('Gundl.' Pfr.). PI. 27, figs. 31, 32. 



Shell perforate, ovate-conic, rather thin, obliquely costu- 

 late ; whitish, generally variegated with corneous and with a 

 rather wide corneous band. Spire conic, the apex rather 

 acute; suture simple. Whorls 7 1 /2, a little convex, the last 

 rounded, obsoletely subangular. Aperture nearly diagonal, 

 rounded-lunar ; peristome simple, expanded, the right margin 

 spreading, columellar margin dilated at the insertion, re- 

 flexed. Length 9, diam. 5.66 mm., apert. 3 mm. high. (Pfr.) 



Western Cuba: Mt. Guajaybon (Gundlach). A variety at 

 Isabel Maria (Wright). 



Macroceramus latus Gundl. mss., PFR., Malak. BL, ix, 1863, 

 p. 17, no. 75, and p. 127; Monogr., vi, p. 348; Novit. Conch., 

 p. 383, pi. 89, f. 9-11. ARANGO, Fauna, p. 82. 



Distinguished by its broad, compact form. The specimens 

 from Isabel Maria are less depressed, have an interrupted 

 band, and differ in several respects, so that a description 

 and figures (pi. 27, figs. 33, 34) of them follow: 



Shell minutely perforate, acutely ovate-conic, rather solid; 

 white with a band of oblong corneous spots above the periph- 

 ery and suture, the earlier whorls corneous. Surface luster- 

 less, the upper half of the spire sharply, finely rib-striate, 

 the stride becoming obsolete or subobsolete on the later whorls. 

 Spire conic, a little attenuate above. Whorls 8%, slightly 

 convex, the last rounded peripherally. Aperture small, 

 oblique, somewhat ovate ; peristome narrowly expanded, colu- 

 mellar margin dilated at the insertion. Length 8.2, diam. 5 

 mm.; length 8, diam. 4.5 mm. 



