380 Prof. Agassiz on Viviparous Fishes from California. 
noid fishes, whose blood quite resembles that of the Articulata, 
the spleen is so feebly developed that its existence was for a long 
_ time denied. 
These data are worthy of remembrance, and without a more 
detailed discussion, I think we are justified in concluding, if any 
conclusion is now proper, that the spleen is a vascular-lymphatic 
gland, whose function is intimately connected with the forma- 
tion of the blood, by the elaboration of chyle-products. 
Literature of the Blood-corpuscle-holding Cells. 
fre Miiller’s Arch. 1834 
k, Diagnostische 99 Patiogenctische Untersuchungen. Berlin, 1845, 117, 
— * Mii ae Arch, te 
— Mill Arch, 1 ose: 
Killike, Mittheil d, Zirich ie cee Juni, 1847. 
le and Pfeufer'’s saan ntce pln vit, 261, 
— Cyelop. Anat. and Phys., Art. ‘pleas; 
cic Bola a nd Killiker’s Zeitsch. £ wiss. Zool, i, 1849, 260, 
— ee ii, 1850, 115. 
Mikroskopische Anat. li, 1852, 253 
Eeker, as 2 ret a Zeitsch. f. rat, Med, i iv, 1847, 261, 
—+— Ibid 
— Wagner's H andw, d, Phys. iv, ed gi, 
Landes Beitr. z. Lehre v. d. Verricht. d. Mila, *Ziirich, 1847. 
Virchow, Arch. f. pa th. Anat i, 1847, p. 3 379, anil ii, 1849, 9, 587, 
Gerlach, Henle and Pfeufer’ § Lailech, f. rat. Med. vii, 1848, 75. 
—- Gew eeu. Pe pg 848, 2 
Schiffner, Henl a Pyeafors Zeitsch, f. rat., Med. vii, 345. 
Reichert, Miiller’s A esb, 2 
Glare Gluge's Pathol. "histol 1850, "31, 
Glu bic 
Ginsburg, Miller's Arch. 1850, 167. 
ger F Vierteljahrachift, — ii, Anal. 18. 
‘a snl Tbid. 1851, iii, Anal. 
Leydig, Beitr. zur mikr. Anat. u. ot eo Rochen u. Haie. ee 1s 58, 62, 
— Anat, histol, Untersiich. ib. Fische u. Reptilien. titers: 18 
Wharton Jones, Brit. and For. oh ee Raivio: 1853, No. pan 
Arr. XLIL—E xrtraordinary Fishes from ratiecrite constilu- 
ting a new Family, described by L. Agassi 
Asout fifteen months ago, I received a letter from A. C. Jack- 
son, Esq., soon after his return from San Francisco, California, 
informing me that while fishing in San Salita Bay, he had caught 
with the hook and line, a fish of the perch family, containing liv- 
ing young. The statement seemed so extraordinary, that though 
an outline of the specimen observed was enélosed, I suspected 
some mistake, and requested Mr. Jackson to furnish me further 
information upon what he had actually seen, and if possible speci- 
mens of the fish preserved in alcohol. To ose ine 
the following answer : S : 
he ee 
