MICROCERAMUS. 159 



regularly toothed suture. It was at one time supposed to be 

 identical with M. kieneri Pfr., but is quite distinct. I have 

 seen no evidence of the occurrence of M. pontificus except 

 near the mouth of Miami river, the wider range formerly 

 given pertaining largely to M. florid-anus. It lives under 

 stones near the Miami river, where specimens were taken by 

 Mr. Rhoads and myself. Probably this was where Bartlett 

 got the type specimens, as it is known that he was at that 

 place, and, so far as I know, M. pontificus has been found 

 nowhere else. 



6. M. FLORID ANUS (Pilsbry). PI. 25, figs. 95, 96, 97, 98. 

 The shell is similar in general appearance to M. gossei, but 



is usually smaller, with 9 to 10 whorls. The thread-like strife 

 are finer and closer, two or three uniting to form each sutural 

 papilla; and these papillae are lower and less prominent. 

 Specimens measure 8.5 x 3 mm. ; 6.5 x 2.5 mm., etc. 



Florida: Sarasota Bay (type locality) and Goodland 

 Point (Hemphill). 



Macroceramus gossei Pfr., W. G. BINNEY, in part, exclu- 

 sive of description and figures, which pertain to Jamaican 

 shells. Macroceramus floridanus PILSBRY, Nautilus, xi, p. 107 

 (name only) ; xii, p. 23 (June, 1898). 



In the Jamaican M. gossei the striation is coarser, the 

 sutural papillae being formed by single striae or the conflu- 

 ence of two; and the shell is generally larger and more con- 

 spicuously variegated than in this southwestern Florida form. 



7. M. GOSSEI (Pfeiffer). PI. 25, figs. 91, 92, 93, 94. 



Shell shortly rimate, turrite with convex outlines, being 

 therefore somewhat cylindric below. Opaque whitish, with 

 irregular or lunate streaks and scattered dots of corneous- 

 brown. Surface somewhat shining, sculptured with thread- 

 like, oblique rib-striae, about every second riblet terminating 

 in a boss or projection at the suture above, or sometimes two 

 riblets unite to form a projection; each riblet being a little 

 swollen, drop-like, at the lower end in many specimens. 

 Whorls about 11, the upper ones corneous-brown, very con- 



