-i-;2 MR. E. A. SMITH ON SHELLS FROM ADEN. [Juiie 16, 



Philippi), D. oralis, Riimer, D. eunice, A. Arlan^s, and perhaps D. 

 hisecta, Reeve. The first, three species were described from speci- 

 mens from unknown localities and the last was said to be Japanese. 



Artemis cceluta. Reeve, considered by Romer to be synonymous 

 with D. pubescens, is distinct. The lunula is longer and not so deep ; 

 the posterior dorsal area is seen to be different on comparison, and the 

 concentric ridges are more conspicuously elevated at the extremities, 

 forming a sort of crest circumscribing not only the posterior area, but 

 also the lunule in front. The anterior muscular impression is nar- 

 rower and the hinge-plate not quite so strong as in D. pulescens. 



D. erythrceu, Romer, was described from a specimen said to have 

 come frcm Aden. It certainly is the same species as D. rndiata. 

 Reeve, and D. amphidesmoides, Reeve, and the shell identified by 

 Deshayes * as D. dilatata of Philippi also belongs to the same form. 

 Reeve quotes " Mouth of the Gambia " as the locality for D. radiata, 

 and it has been suggested by Menke and Romer that this species is 

 the " Colan " of Adanson. I am much inclined to doubt the 

 accuracy of this identification and also of Reeve's habitat ^. D. 

 omphidesmoides is a Philippine shell ; D. erythrcea, as stated above, 

 is from Aden, and Deshayes's specimen of D. dilatata in the Museum 

 also came from the Red Sea. 



186. DosiNiA ALTA, Dunker. 

 Hab. Red Sea. 



187. SUNETTA CONTEMPTA, nom. HOT. 



Meroe mejistrualis. Reeve (non Meuke), Concii. Icon. vd. xiv. 

 fig. 9. 



This species is net the young of the Japanese S. menstrualis as 

 supposed by Romer (Monog. Sunetta, p. 14). It is more convex, 

 its shape is different, the ends being more equal than in Menke's 

 species, and the valves are seen to be thicker and stronger when 

 shells of equal size are compared. The interior is more or less 

 purplish or purplish brown. In S. menstrualis the pallial sinus 

 terminates in an acute point, whereas in the present species it is 

 rounded. 



I would here point out the shells figured lioth by Sowerby ^ and 

 Retve* as S. excavata are rather young specimens of -S'. menstrvalis. 

 Sowerby, however (pi. clxiii. fig. 17, not 16 as in text p. 742), 

 lias correctly depicted S. excavata by copying Philipni's figure ' of 

 iS. vaginalis, which is a synonym of that Sj cnes. In my opinion 

 5. alicice, Adams and Angas, is also synonymous. S. svbquadiata 

 (Sowerby, pi. 129. f. 9, and Reeve, f. 7, as vaginalis), as suggested 

 by Riimer, may be the young of excovata, but it seeu.s to be lather 

 more oblong. 



> Cat. Conch. Biv. Mus. Brit, part i. p. 12. 



^ Istel quotes I>. radiata t'roru Suez (Mai. Mar. Eosa. p. 72). 



"^ The*. Coneh. vol. ii. pi. 12f>. if. 13, 14. 



* CoiiL-h. Icon. Meroe, pi. iii. tf. 11 a-h. 



' Abbild. vol. ii. Cythereu. pi. iii. f. 2. 



