^t-2 MR. E. A. SMITH ON SHELLS FROM ADEN. [Jlllie 16, 



Philippi), D. ovalis, Riimer, D. eunice, A. Adams, and perhaps D. 

 hisecta. Reeve. The first three species were described Irom speci- 

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



Artemis ccelata. Reeve, considered by Romer to be synonymous 

 with IJ. pubescens, is distinct. Thelunule 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 ihe lunule in front. The anterior muscular impression is nar- 

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



D. erythroeu, Riimer, was described from a specimen said to have 

 come from Aden. It certainly is the same species as D. radiata. 

 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 Adans( n. I am much inclined to doubt the 

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

 cmphidesmoides 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. SxJNETTA CONTEMPTA, nom. nov. 



Mcroe menstritalis, Reeve (non Menke), Conch. Icon. vcl. xiv. 

 fig. 9. 



This species is not the young of the Japanese S. menstruahs as 

 supposed by Riimer (Monog. Sttnetta, 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 t-ize 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 both by Sowerby ^ and 

 Reeve* as S. excavata are rather young specimens oi S. menstrvaiis. 

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

 has correctly depicted S, excavata by copying Philippi's figure" of 

 (S. vaginalis, which is a synonym of that Sjcies. In my opinion 

 S. alicice, Adams and Angas, is alto synonymous. S. subquadi ata 

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

 by Romer, may be the young of excavata, but it seems to be lather 

 more oblong. 



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



^ Issel quotes I), radiata from Suez (Mid. Mar. Eo.'s. p. 72). 



3 Thes. Conch, vol. ii. pi. 126. ff. 13, 14. 



* Conch. Icon. Mcroe, pi. iii. if. 11 a-b. 



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



