HISPANIOLAN AND BAHAMAN ANNULARIIDAE 239 



OPISXHOSIPHON (OPISTHOSIPHON) GOLDLNGI GOLDLNGI, new subspecies 



Plate 37, Figure 14 



This subspecies differs from O pisthosiphon (Opisthosiphon) goldingi 

 masticensis in being uniformly smaller, with the axial ribs much less 

 numerous and less closely spaced and with much weaker spiral sculp- 

 ture. The type has 70 axial riblets on the first, 86 on the second, and 

 106 on the last of the remaining turns. The spiral sculpture is extremely 

 feeble and cannot be made out on the first two turns; on the last turn 

 13 feeble threads may be noted between the summit and the periphery. 

 There are also seven weak spiral threads on the base and five additional 

 threads on the umbilical wall. 



The type (U.S.N.M. No. 269405) was collected by Bartsch on Golding 

 Cay off the east entrance to South Bight of Andros Island, Bahamas. 

 It has a little over 3 whorls and measures: Length, 8.7 mm.; greater 

 diameter, 5.1 mm.; lesser diameter, 4.2 mm. 



U.S.N.M. No. 269681 contains 32 topotypes from the same source. 



OPISTHOSIPHON (OPISTHOSIPHON) DREVVI, new species 



Plate 37, Figure 15 



Shell elongate-conic, fiesh-colored, with a yellowish tinge, unicolor 

 or interruptedly spirally banded ; the peristome is yellowish white. Nu- 

 clear whorls 2, small, well rounded, smooth except for the last portion 

 of the last turn, which shows the beginning of the postnuclear sculpture. 

 Postnuclear whorls strongly rounded, rather strongly, narrowly shoul- 

 dered at the summit, marked by slightly retractively slanting, somewhat 

 wavy axial riblets, of which 60 occur on the first, ^2 on the second, 88 

 on the third, and 112 on the last of the remaining turns in the type. Most 

 of these riblets form rather strong, acute hollow cusps at the summit. 

 The spiral sculpture consists of slender threads, of which 10 occur on 

 the first, 13 on the second, and 14 on the last turn between the summit 

 and suture. Suture channeled. Periphery well rounded. Base short, well 

 rounded, openly umbilicated, marked by the continuation of the axial 

 riblets and 10 slender spiral threads; 10 additional threads are present 

 within the umbilicus. Aperture broadly oval ; peristome double, the outer 

 a little wider on the inner than the outer lip, forming a conspicuous 

 auricle at the posterior angle, which is rendered rather irregular by the 

 siphon immediately behind it to which it is appressed ; the outer peristome 

 is marked by slender concentric lines; inner peristome slightly exserted 

 and slightly reflected. Operculum typically opisthosiphonid. 



The type (U.S.N.M. No. 270066) was collected by the author on 

 Smith's place on the south side of South Bight at its eastern termina- 

 tion, Andros Island. It has a little over 3 whorls and measures : Length, 

 II. 2 mm.; greater diameter 6.1 mm.; lesser diameter, 5.0 mm. 



