MUSEUM OF COMPARATIVE ZOOLOGY. 45 



Batissa laevigata, Schumacher. 



PL 11. Fig. 5, a, b, c. 



Cyclas Icevigata, Schumacher. Schuin. Essai d'un noiiv. syst. 170, PI. XII. 



Fig. 1, 1817. 

 Cijrena Childrence, Gray. Ann. Phil. 117, 1825. 



Venus CJiildreni, Gray. Wood, Index Test, suppl. PI. 2, Fig. 13, 1828. 

 Batissa Childrence, Deshayes. Brit. Mus. Cat. Conchif. 237, 1854. 



B. testa ovato-subrotunda, obliqua, iusequilaterali, depressiuscula, 

 crassa, solida, postice ab umbouibus obscure subangulata, epidermide 

 fusco-viridi nitente induta, iutus pallida violacea ; latere antico breviore, 

 obtuso, transversim infequaliter sulcato; sulcis in medio evanidis; latere 

 postico latiore rugis irregularibus divergentibus notato, lamina cardinidi 

 lata, crassa, dentibus primariis tribus insequalibus, in utraque valva 

 medianis validioribus ; dentibus lateralibus subsequalibus, antico basi 

 lato. 



Long. 38; lat. 34; diam. 16 mill, 



Hab. Philippine Islands (fide Deshayes). 



Collect. University of Copenhagen (one specimen, Schumacher's type). 

 Brit. Mus. ; Prime. 



While in Copenhagen (1872), I was able, thanks to the courtesy of 

 the late learned Mr. March, to examine, in the collection of the Univer- 

 sity, the type of Schumacher's Cyclas laevigata (which I have figured, PI. 

 II. Fig. 5). Schumacher's shell I found to correspond in every respect 

 with a species which had been subsequently described under the name 

 of Childrence. 



Fisidium Steenbuchii, Moller. 



PL II. Fig. ], a, h, c, d, e. 



Cyclas Steenbuchii, Moller. Xatur. Tid. IV. 76. 1842. 

 Sph(trium Steenbuchii, Deshayes. Brit. Mus. Cat. Conchif. 264, 1854. 

 Pisidium Steenbuchii, Morch. Prod. Moll. Griinl. 19, 1857. 

 Pisidium fontinale. Midd. Reise. 



Pisidium Steenbuchii, Mdrch. Am. J. Conch. IV. 37, PI. IV. Fig. 10, 1868. 

 Mart, and Chemn. Cycladea, 35, PI. 3, Figs. 21, 22, 1877. 



P. testa oblique-ovalis, ventricosa, striis increment! subtil issimis ; 

 cinereo hitescente ; intus cinerea ; umbonibus prominentibus. 

 Long. 4 ; lat. 3 ; diam. 3 mill. 



