153 249 
Dosinia exasperata, Phil. 
Cytherea (Artemis) exasperata, Puinipp1, Abbild. u. Beschreib. neuer od. wen. gek. Conchyl., III, 1847, p. 24 
(36), pl. 8, fig. 4. 
Artemis exasperata, Puitipr!1, Sowersy, Thesaur. Conchyl., Il, p. 670, No. 55. pl. 143, fig. 62. 
— — - Reeve, Conchol. icon., VI, Artemis, Sp. 21. 
Dosinia _— — HipaiGo, Obras malacologicas, I, tom. II, 1903, p. 311, No. 407. 
The sound of Koh Chang, 5 fathoms, soft clay (/:). W. of Koh Kut, 15--30 
fathoms, mud (°/2). 
Long. 8—30 mm. 
Distribution: — Coromandel Coast (?), Karachi, Mekran Coast. -- Philippines. 
Several authors have connected Dosinia prostrala 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 University of Copenhagen SPENGLER’s specimen of Dos. 
prostrata L. is labelled: “Venus prostrata Lin. Sp. 187. Chemn. Tom. 6, fig. 298, 
Tranquebar.” It exactly agrees with the figures in HANLEy’s Ipsa Linnei Conchyl., 
Pl.1, Fig.7; in Encyclop. méthod., Pl. 277, Fig. 1; in REEvE, Conchol. icon., Sp. 23; 
in HANLEy, Monogr. (SowEersBy, Thes. Conchyl.), Pl. 144, Fig. 80, and with the 
description in Cuemnitz, Conchyl. Cabin., VI, p.302.' It may probably be assuined 
that SPENGLER’s specimen is correctly determined, at any rate it undoubtedly 
corresponds with Cuemnirz’s view of prostrata;* but SPENGLER’s prostrata and 
Puitippi’s exasperata differ 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: while 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. ROmeER’s Dos. prostrata L. is certainly not 
SPENGLER’s (CHEMNITz’s) species of that name; the latter ROMER has determined as 
Dos. Bruguiert, Gray. 
Dosinia dilecta, A. Ad. 
(PI. V, Figs. 11—13). 
Dosinia dilecta, A. AbAms, Proc. Zool. Soc. London, 1855, p. 224, No. 15. 
— _ = Romer, Monogr. d. Molluskengatt. Dosinia, 1862, p. 66, No. 77. 
The sound of Koh Chang, 5 fathoms, soft clay (t'/2). 
Long. 40 mm., alt. 41 mm., crass. 21 mm. 
1 The figure on Pl. 29, Fig. 298 is not good, and does not agree with the description; the phrase 
“testa orbiculari valde compressa et complanata” suits the figure but badly; so also the synonyms given 
by CHEMNITZ unquestionably do not all refer to this form; how far on the whole Linné and CuEemnirz 
have had the same form before them I am not prepared to say. 
2 SPENGLER and CHEMNITZ were in daily communication with each other; see Malakozool. Blatter, 
XVII, 1870, p. 99. ° 
D, K. D. Vidensk. Selsk. Skr., 7. Reekke, naturvidensk. og mathem. Afd. V. 3. 32 
