86 
the circuli are wanting in the apical field, though there are coarse lines 
of growth. This is quite like the scale of Pseudogobio esocinus, except 
that it has some basal radii. 
4) Ischikauia steenackeri Sauvage. Lake Biwa, Japan (Jordan 
and Snyder) (fig. 3). In addition to what has been said above, attention 
must be directed to the central nucleus. Jordan and Fowler remark 
that this genus seems to be allied to Xenocypris. 
5) Xenocypris microlepis. Kiu-Kiang (Styan). Brit. Museum. 
Scales with the same shape and central nucleus as /schikauia, but the 
Fig. 3. Fig. 4. 
Fig. 3. Ischikawia steenackeri. Fig. 4. Zacco platypus. 
coarse apical circuli regular, transverse, not at all angled, and not nearly | 
so widely spaced. 
6) Xenocyprisargentea. Mountain streams near Kiu-Kiang(Styan). 
Brit. Museum. Circuli as in X. microlepis, but nucleus well basad of 
Fig. 5. Aspidoparia morar. 
middle, and laterobasal angles distinct. No sign of basal radii in either 
species. Except for the absence of basal radii, this scale reminds one 
very much of Chondrostoma knerii. It is probably near the stem-form 
of the Xenocypris-Ischikauia series. See Zool. Anz. XXXVI. p. 253. 
fig. 5. 
7) Zacco platypus Schleg. Goto Island, Japan (Gordon Smith). 
B. Museum. (Fig. 4.) I also have this fish from Dr. Jordan. The 
