MUSEUM OF COMPARATIVE ZOOLOGY, 45 
Batissa laevigata, SCHUMACHER. 
Pl. II. Fig. 5, a, b, c. 
Cyclas levigata, Schumacher. Schum, Essai d'un nouv, syst. 170, Pl. XII. 
Fig. 1, 1817. 
Cyrena Childrene, Gray. Ann. Phil. 117, 1825, 
Venus Childrent, Gray. Wood, Index Test. suppl. Pl. 2, Fig. 13, 1828, 
Batissa Childrene, Deshayes. Brit, Mus. Cat. Conchif. 237, 4, 
B. testa ovato-subrotunda, obliqua, insquilaterali, depressiuscula, 
crassa, solida, postice ab umbonibus obscure subangulata, epidermide 
fusco-viridi nitente induta, intus pallide violacea ; latere antico breviore, 
obtuso, transversim inzqualiter sulcato; sulcis in medio evanidis ; latere 
postico latiore rugis irregularibus divergentibus notato, lamina cardinali 
lata, crassa, dentibus primariis tribus ineequalibus, in utraque valva 
medianis validioribus; dentibus lateralibus subaqualibus, antico basi 
lato. 
Long. 38; lat. 34 ; diam. 16 mill. 
Han. Philippine Islands (fide Deshayes). 
Correct, 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. Mórch, to examine, in the collection of the Univer- 
sity, the type of Schumacher's Cyclas levigata (which I have figured, Pl. 
IL Fig. 5). Schumacher's shell I found to correspond in every respect 
with a species which had been subsequently described under the name 
of Childrene. 
Pisidium Steenbuchii, 
Pi Ll, fig. 1, a, b, o, d, e 
Cyclas Steenbuchii, Moller. Natur. Tid. IV. 76. 1849, 
Spherium Steenbuchii, Deshayes. Brit. Mus. Cat. Conchif. 264, 1854. 
Pisidium Steenbuchit, Mórch. Prod. Moll. Grónl. 19, 1857. 
Pisidium fontinale. Midd. Reise. 
Pisidium Steenbuchii, Mórch, Am. J. Conch. TV. 37, Pl, IV. Fig. 10, 1868. 
Mart. and Chemn. Cycladea, 35, PI. 3, Figs. 21, 22, 1877. 
P. testa oblique-ovalis, ventricosa, striis incrementi subtilissimis ; 
cinereo lutescente ; intus cinerea; umbonibus prominentibus. 
Long. 4; lat. 3; diam. 3 mill. 
