VIVIPAROUS FISHES OF THE PACIFIC COAST. 
391 
10. DITREMA TEMMINCKII Bleeker. 
Ditrema, Schlegel, 1. c. (abundant in spring in Bay of Nagasaki); Gill, Proc. Phil. Acad. Sci. 
1862, 126. 
Ditrema temminclcii Bleeker, 1. c. ; Brevort, 1. c. (Hakodadi, in latitude 41° 49' N.); Gunther, 
Cat. Fish. Brit. Mus., iv, 246, 1862 (Japan) ; Bleeker, “ Notices Ichthyologiques No. x.” ; 
Putnam, “Bull. Mus. Comp. Zool. Nystrom, Sv. Ak. Hand., xm, afd. 4, No. 4, p. 32 
(Japan). 
Ditrema Iceve Giinther, Cat. Fish. Brit. Mus., n, 392, 1860 (Japan.) 
Habitat: Japan. 
Brevoort says, i. c. : 
The genus Ditrema was established by Schlegel upon examination of two stuffed specimens and 
a native figure of a fish which offered the peculiarity of two anal orifices. * * * He gave the fish 
no specific name. * * * The figure by the artists of the United States Japan Expedition is iden- 
tical with the one in the Fauna Japonica, though rather darker in coloring. It does not show the specific 
characters distinctly. * * * Upon showing the published figure of the Ditrema, and the figure 
of it by the American artist, to Diengkitch, he immediately described its viviparous faculty. * 
In the list of fishes * * * is one called in Chinese Jw or Lian, in Japanese Tanalco, “a fish which 
swims in pairs”; and in a footnote Mons. A. Remusat (Notices et Extraits des Manuscrits, tome Xi, 
part 1, 1827, p. 216) says : “ It is asserted that this fish is viviparous * This very interesting 
note, the authority for which is not given, induced me to compare the Ditrema with a specimen of 
the California viviparous fish procured by Dr. John LeConte in that country in 1851, and with the 
descriptions of the Embiotocidw and Holconoti, by Agassiz * * * “when no doubt remained on my 
mind that species of the same family of fish were thus proved to occur on the Asiatic coast of the 
Pacific also. 
11 DITREMA SMITTII Nystrom. 
Ditrema smittii Nystrom, Sv. Ak. Handl., xm, 4, afd. No. 4, p. 32, 1887 (Japan). 
We add here the original description, a copy of which has been furnished by Dr. 
Theo. Gill : 
No. 86. Ditrema smitti* n. sp. 
Diagn . — Kroppens hojd ungefar £ af totallangden ; bakre delen af analfenan betydligt hogre 
an den framre, och 17 :de — 20 :del stralarne tradforinigt fbrliingda ; brostfenornas spetsar na till analfen- 
ans borjan. 
R. f.11+21. A. f. 3+27., Br. f. 17. L. lat. 78. 1. tr. If 
Kroppsformen ar nagot mera langstrackt an hos foregaende, med hvilken denna art for ofrigt 
synes visa niirmaste slagtskapen, och storsta kroppshojden utgor ungefar i, och hufvudets langd £ af 
total-langden. Ogats diameter innehalles i det narmaste 4 ggr., och nosens liingd, som ar lika med 
pannans bredd mellan ogonen, 3£ ggr. i hufvudets liingd. 
Nosen dfre profilkontur ar svagt konvex, och mellan ogonen ar en framskj utande knol, bakom 
hvilken pannan ater ar nagot intryckt. Bakre delen af hufvudet ar mera konvex och starkare 
uppstigande, dock ej sa mycket som hos foregande art. Ryggen ar temligen jamnt bojd till slutet af 
ryggfenan, och afstandet fran basen af den sista ledade stralen till spetsen af stjartfenans ofre flik ar 
nagot storre an hos D. laeve, och lika med afstandet fran nosspetsen till bukfenornas rot. 
Framre afdelningen af ryggfenan ar lag och taggstralarne tilltaga successivt i liingd bakat ; den 
sista ar dock nagot lagre an den forsta ledade stralen, och dess liingd uppnar ungefaar -J- af hufvudets. 
Den mjukstraliga delen af ryggfenan iir temligen jiimnt afrundad, och de mellersta stralarne', som aro 
de liingsta, innehallas omkring 2ggr. i hufvudets langd. 
Analfenan har den bakre afdelingen, fran med den 16 :de stralen, betydligt hogre an den framre, 
och ofvergangen mellan de bada afdelnidgarne sker hastigt, sa att den 16 : de stralen ar i det narmaste 
dubbelts a lang som den fore gaende. 17 :de — 20:de fenstralarne aro tradformigt forlangda, och af 
dessa aro de bada mellersta langst och ungefar lika langa som brostfenorna. 
Arten ar uppkallad after en af gifrarne, Herr J. C. Smitt i Japan. 
