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Show 234 MR. G. A. BOULENGER ON [Apr. 7, 7. ARIUS COMMERSONII, Lacep. Notes on the habits and development of this Siluroid in the Laguna dos Patos have been published by Dr. v. Ihering, Biol. Centralbl. viii. 1888, p. 268. 8. GENIDENS CUVIERT, Cast. 9. CALLICHTHYS ASPER, Q. & G. I agree with the Eigenmanns in referring C. affinis, Gthr., and C. hemiphractus, Hens., to this species. The Rio Grande specimens have usually ~ scutes ; and I may add that we have a specimen from Bahia with as many as ~. 10. CALLICHTHYS (CORYDORAS) PALEATUS, Jen. 11. LORICARIA ANUS, Val. In a large specimen, 420 millim. long, the length of the first dorsal ray is 1 -jlj in the length of the head (to extremity of occiput), and the diameter of the orbit (without the notch) is 4\ in the length of the snout. In a small specimen, measuring 170 millim., the length of the first dorsal ray is 1^ in the length of the head, and the diameter of the eye 2| in the length of the snout. Two or three minute teeth are present on each side of the upper jaw. Upper caudal lobe considerably longer than the lower. 12. LORICARIA LIMA, Kner. Although I have examined but three specimens, two of which I would refer to L. striyilata, I am much inclined to agree with Dr. v. Ihering (in litt.) in regarding L. striyilata and L. cadece Hensel as based on variations of L. lima. 13. OTOCINCLUS NIGRICAUDA, sp. n. (Plate XXV. fig. 3.) D. 1/7. P. 1/5. V. 1/5. A. 1/5. L. lat. 23-25. Closely allied to O. affinis, Stdr., but snout more rounded, eye rather smaller, its diameter two fifths the length of the snout, and ventral shields more numerous and irregular, forming five to seven longitudinal series. The coloration is very different from that of 0. affinis. Dark olive-brown above ; dorsal, anal, and paired fins with the rays barred black and white ; caudal deep black, with the outer rays spotted with white. Total length 42 millim. Several specimens. 14. PLECOSTOMUS COMMERSONII, Val. 15. CH,ETOSTOMUS CIRRHOSUS, Val. (Plate XXVI. fig. 1.) I give figures illustrating the very marked differences between the heads of male and female as shown by specimens from Dr. v. Ihering's collection. In addition to the rostral appendages and the stronger praeopercular armature, the male differs in the longer pectoral fin, which extends to the middle of the ventral spiue instead of to its base. |