168 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



spiral sculpture consists of threads a little less strong than the axial ribs. 

 Of these, 13 are present between the summit and the periphery on the 

 last turn. Suture strongly constricted, rendered crenulated by the tufts. 

 Periphery inflated, strongly rounded. Base moderately long, inflated, 

 strongly rounded and marked by the continuation of the axial ribs and 

 10 spiral threads. Umbilicus rather open and marked by the feeble con- 

 tinuation of the axial ribs and six spiral threads. Aperture broadly oval. 

 Peristome double, the inner expanded and reflected and appressed to 

 the outer; the outer moderately broadly expanded, slightly auriculated 

 at the posterior angle and almost absent on the columellar and the parietal 

 wall. Operculum with a subcentral nucleus and a broad flaring lamella, 

 which is marked by slender, retractively slanting threads. 



The type (U.S.N.M. No. 5o4i3o) was collected by Dr. W. L. Abbott 

 at Port-au-Paix, Haiti. It has 7 whorls and measures : Height, 148 mm. ; 

 greater diameter, 7.8 mm. ; lesser diameter, 6.8 mm. 



U.S.N.M. No. 218044 contains 14 topotypes from the same source. 



This species resembles most nearly Troschelvindex laferrierensis but 

 is easily distinguished from it by its paler coloration and the greater num- 

 ber of spiral cords on the umbilical wall. 



TROSCHELVINDEX GONAIVENSIS, new species 



Plate 29, Figure 7 



Shell elongate-conic, flesh-colored, with a yellowish tinge, marked by 

 dots arranged in both axial and spiral series. Of these bands six are 

 present between the summit and the suture on the spire and four on the 

 base. The outer rib is rayed with similar elongate spots of brown. 

 There is also a dark dot at the beginning of the nucleus. Nuclear whorls 

 1.8, inflated, strongly rounded, forming a depressed apex. Postnuclear 

 whorls strongly rounded and marked by rather strong, rounded, closely 

 spaced axial ribs, which are gathered into tufts at the appressed summit. 

 The spiral sculpture consists of moderately strong threads which render 

 the axial riblets feebly nodulose at their junction. Of these threads, 15 

 are present between the summit and the periphery on the last turn. The 

 base is also marked by spiral threads, but they gradually grow less strong 

 from the periphery toward the umbilicus, while the umbilicus bears three 

 much stronger spiral threads and a fourth less strong, forming the in- 

 nermost element. Suture constricted. Periphery well rounded. Base mod- 

 erately broadly umbilicated. Aperture ovate; peristome double, the inner 

 reflected and appressed to the outer ; the outer narrowly expanded. Oper- 

 culum with a strong outward flaring lamella, which is a little more than 

 one-half the width of the basal chondroid plate. The lamella is marked 

 by strong, retractively curved threads. 



The type (U.S.N.M. No. 393770) I collected 10 miles north of 

 Gonaives. It has 7.8 whorls and measures : Height, 16.7 mm. ; greater 

 diameter, 8.0 mm. ; lesser diameter, 6.5 mm. 



