- 594 - 



Ij- serrate. 



Dimerisiong .- Lat., 25.5 mm.; alt., " ." m. ; semicliam., 9 ram. 



Re marl's .- Four valves of _0. inconspic-aii m are at hand, three 

 of Vnese "be iii^- ad-alt and conaiderabl;; lar'^-^r '-'-lo specimen 



fig 11 -PP^"» inniatiire valve has onl;/ thirtv-foiir rios, 



both ribs and interspaces being wider than on the adtilt and the 

 timbo slightly- higher. On adttLt shells the distel portions of a- 

 few of the anterior ribs may be smooth. Ta.e no" " ai' 



not be eonfine" to the first ten or thirteen ri~ , further 



tavard the oeii ''•::. ^ of the shell uhj.^ appear near the distal ends 

 of a few additional ribs. 



i^his species is characterized bj' its si^bn-" mtline, 



low iiDibonet-, Liid low, narrow ribs v-jiiiGh be "■ ■>--y^ 



straie. Guppy's doubt concerning the impossibility of separat- 

 ing dominicense "i,bb v/as mded; dominicense . first described 

 from oanto Domingo (l) and Is. i.fi- j^eporte" from Sapote, 3os--:a 

 Rica (2), and ''at;m, Panama (?;), being entirely different, jJhe 



(1). Trar .: . Am. Philos. See., new sfr., vol. 15, op. 250-251, 

 1875. 



(r). Gabb, ■,'/. M, , Jour. Acad. l.u.'.. oci., Philadelphia, 2nd ser., 

 vol. 8, p. 344, 1Q81. 



{■"), G-abb, ./, M, , idem; Joula, ?., Jahrb. x..-:.. gool. Heichsanst- 

 alt, vol. 58 pp. 720-721, pi. 27, fig. 4; pi. 23, firr. 18, 

 1908, as G_. r'-Jrach; oaa'dium) p-at an ens e n. sp. (not G. f prag- 

 Mm\ gativ.-ense Dall. 1900). fide Brown, and Pilsbrv, Proc. 

 Acad. Hat. 3ci., Philadelphia, vol. 5?, t,. c.57^ 1911. 



