144 MACROCERAMUS, CUBA. 



M . crenatus Gundlach mss., PFR., Malak. BL, xi, 1863, pp. 

 16, 127 ; Novit. Conch., p. 384, pi. 89, f . 15-19 ; Monogr., vi, 

 p. 353. ARANGO, p. 86. 



Not known to me by specimens. 



27. M. FESTUS ' Gundl.' Pfr. PL 20, figs. 15-18. 



Shell rimate, oblong-turrite, solid, the upper whorls rib- 

 striate, later ones nearly smooth. Bluish or fleshy-white, one 

 or two early post-embryonic whorls dark, the following ones 

 more or less streaked indistinctly, last whorl uniform or with 

 a peripheral series of blackish spots or streaks. Spire long, 

 a little swollen in the middle, the apex generally truncate ; 

 when retained it is smooth and whitish. Whorls 10-11 in 

 perfect, 7-8 in truncate shells; slightly convex, the last well 

 rounded, somewhat contracting at the aperture. Suture 

 crenulate, at least above the middle of the shell. Aperture 

 subvertical, obliquely oval, dark within, the lip obtuse, not 

 expanded, continued in a thick callous across the parietal 

 wall. 



Length 8 to 12, diam. 4 mm., whorls remaining 6 to 9. 



Length 10.5 to 13.3, diam. 5 mm. (types). 



Eastern Cuba: Caimanera, dist. of Guantanamo, and on 

 both sides of the mouth of the bay, on bushes (Gundlach). 



M. festus Gundl. mss., PFR V Malak. BL, vi, 1859, p. 94, no. 

 62; Novit. Conch., p. 386, pi. 89, f. 25-28; Monogr., vi, p. 

 352. ARANGO, p. 85. 



M. festus is closely related to M. costulatus, from which it 

 differs in being somewhat larger and smoother, but there 

 are some intermediate forms. M. jeannereti is generally 

 more spotted, but differs chiefly in the thinner parietal cal- 

 lous, and different shape of the mouth. All of these species 

 from the southern coast of the province of Santiago are very 

 closely related, and probably will be connected by inter- 

 mediate forms when more localities are worked up. 



Some specimens of M. festus are quite prettily marked. 

 On a ground color of pale ochre there are two blue-white 

 bands, the upper one narrow, the lower one wider, at the 



