284 SUBEMARGINULA. 



Subemarginula arabica A. Adams. Shell whitish, thick, depressed- 

 conical, vertex obtuse, subcentral, inclining backward; latticed 

 with tuberculose radiating ribs and elevated transverse lines ; mar- 

 gin of aperture thick, crenate, sinuate in front, sinus produced into 

 a canal inside. Red Sea. (Ad. P. Z. S. 1851, p. 90, no. 10). 



Subemarginula catillus A. Adams. Shell elongate-oval, much de- 

 pressed, vertex little elevated, inclining backward ; ornamented 

 with thick nodulous radiating ribs and transverse lines of growth ; 

 margin of the aperture irregular, crenulated, callous inside, deeply 

 sinuate in front. Hab. unknown. (Ad., P. Z. S. 1851 , p. 91, no. 14.) 



Subemarginula denticulata A. Adams. Shell elongate-oval, white, 

 9-radiate, vertex acute, inclining backward ; 9 thick rugulose 

 radiating ribs ; intervals having asperulate longitudinal riblets ; 

 margin of the aperture dentate and denticulate, emarginate in 

 front, sides of incision thickened, produced in front in two teeth. 

 Mexico. (Ad. 1. c., p. 91, no. 15.) 



Emarginula ( Clypidina) radiata Gould, Proc. Bost. Soc. N. H. 

 vii, p. 163.=? Em. australis Linn, teste Tenison- Woods, Proc. Linn. 

 Soc. N. S. Wales, ii, p. 256. 



Emarginula pileata Gld. Loo Ckoo. 



Emarginula altilis Gld. Kagosima Bay, 10 fms. 



Emarginula textilis Gld. Ousima. 



Unfigured species, described in Proc. Bost. Soc. N. H. vii, p. 162. 

 163. 



Subemarginula picta Dunker. 



(Em. picta DKR. Moll. Jap. p. 24, t. 3, f. 15; Ind. Moll. Mar. 

 Jap. p. 152.) 



Allied to Em. pulchra A. Ad., probably a synonym of that form. 

 S. arconatii Issel. (Mai. Mar. Ross. p. 232.) Unfigured. 



Gulf of Akaba. 

 Subemarginula rugosa H. Adams, (P. Z. S. 1872, p. 10, t. 3, f. 7.) 



The name of this supposed new species is preoccupied by Quoy. 

 Subemarginula modesta H. Adams, (I. c. p. 10, t. 3, f. 8). 



This form is doubtless a synonym of an East Indian species. 

 Both this and S. rugosa H. Ad. were described under Emarginula. 



Section Tugalia Gray. 



Tugalia GRAY, Guide Syst. dist. Moll. B. M. 1857, p. 163. Tugali 

 GRAY, olim. 



