153 249 



Dosinia exasperata, Phil. 



Cytherea iArtemis) e.vasperata, Phii.ippi, Abbild, u. Beschreib, neuer od. wen. gelt. Conchyl., Ill, 1847, p. 24 



(36), pi. 8, fig. 4. 

 Artemis e.vasperata, PHii.ii'Pt, Sowerby, Thesaur. Conchyl., 11, p. R70, No. 55. pi. 143, fig. 62. 



— — — Reeve, Conchol. icon., VI, Artemis, Sp. 21. 



Dosinia — — Hidalgo, Obras malacologicas, 1, tom. 11, 1903, p. 311, No. 407. 



The sound of Koh Chang, 5 fathoms, soft clay (/:!). W. of Koh Kut, 15—30 

 fathoms, mud (•''a). 



Long. 8 — 30 mm. 



Distribution:— Coromandel Coast (?), Karachi, Mekran Coast. — Philippines. 



Several authors have connected Dosinia prostrata with the present species; but, 

 as far as I can see, the two species have nothing to do with each other. In the 

 Zoological Museum of the Universitj' of Copenhagen Spengler's specimen of Dos. 

 prostrata L. is labelled: "Venus prostrata Lin. Sp. 137. Chemn. Tom. 6, fig. 29S, 

 Tranquebar." It exactly agrees with the figures in Hanley's Ipsa Linnæi Conchyl., 

 PI. 1, Fig. 7; in Encyclop. method., PI. 277, Fig. 1; in Reeve, Conchol. icon., Sp. 23; 

 in • Hanley, Monogr. (Sowerby, Thes. Conchyl.), PI. 144, f^ig. 80, and with the 

 description in Chemnitz, Conchyl. Cabin., VI, p. 302. ' It may probably be assumed 

 that Spengler's specimen is correctly determined, at any rate it undoubtedly 

 corresponds with Chemnitz's view of prostrata;'- but Spengler's prostrata and 

 Philippi's exasperata diiïer widely, the outline in prostrata being angular, which 

 (especially in full-grown individuals) gives a squarish appearance to the shell; 

 this is compressed (like Circe scripta L.), and the lunule is elongated: v.'hile in 

 Dos. exasperata the outline is almost circular, the shell is more arched, and the 

 lunule is smaller and cordate; and as regards the sculpture, the transverse ribs are 

 more close-set and much finer. Dosinia exasperata, Phil., should therefore be regarded 

 as a distinct, well-characterized species. Römer's Dos. prostrata L. is certainly not 

 Spengler's (Chemnitz's) species of that name; the latter Römer has determined as 

 Dos. Bruyiiieri, Gray. 



Dosinia dilecta, A. Ad. 



(PI. V, Figs. 11— 13|. 



Dosinia dilecta, A. Adams, Proc. Zool. Soc. London, 1855, p. 224, No. 15. 



— — — RÖMER, Monogr. d. Molluskengatt. Dosinia, 1862, p. 66, No. 77. 



The sound of Koh Chang, 5 fathoms, soft clay (I'/a). 

 Long. 40 mm., alt. 41 mm., crass. 21 mm. 



' The figure on PI. 29, Fig. 298 is not good, and does not agree with the description; the phrase 

 "testa orbicular! valde compressa et complanata" suits the figure but badly; so also tlie synonyms given 

 by Chemnitz unquestionably do not all refer to this form; liow far on the whole Linné and Chemnitz 

 have had the same form before them I am not prepared to saj-, 



- Spengler and Chemnitz were in daily communication with each other; see Malakozool. Blätter, 

 XVU, 1870, p. 99. 



D. K. D. VIdensk. Selsk. Ski-.. 7. Ra-kke, natuiviilensk. og mathem. Afd. V. :i. 32 



