“The first Whales appear in the Abrolhos waters at about the end of May, and they stay until October. The females often bring young calves with them, and appear to seek the shelter of the reefs. The headquarters of the Abrolhos fishery is at Caravellas, or, rather, at the mouth of the river Caravellas, where are situated the armações or trying-houses.”—_E. Hartt_, _Geology and Physical Geography of Brazil_, p. 182. “The fishery begins at Bahia, according to Castelnau (Expédition dans l’Amérique du Sud, tome i. p. 750), about the 13th of June, and lasts till the 21st September. At Caravellas I was assured that the Whales always appeared later than at Bahia, and the fishery does not always begin until the last week in June, continuing through the month of September.”—_E. Hartt._ 3. CUVIERIUS. Cuvierius, _Gray_, _l. c._ pp. 114, 164; _Synops. Whales & Dolph._ p. 3. Rostrum of the skull broad, the outer sides curved, especially in front. The second cervical vertebra with two short, thick lateral processes. First rib single-headed. Sternum oblong-ovate, transverse. Hands elongate; fingers slender, second finger much longer than the forearm-bone. Scapula with a broad acromion and a rudimentary coracoid. 1. Cuvierius Sibbaldii. B.M. Cuvierius Sibbaldii, _Gray_, _l. c._ p. 380; _Synops. Whales & Dolph._ p. 3. Cuvierius latirostris, _Gray_, _l. c._ p. 165. Physalus Sibbaldii, _Gray_, _l. c._ pp. 160 (fig. 36), 380. Balænoptera Sibbaldii, _Van Beneden_, _Ostéogr. Cét._ t. 12 & t. 13. figs. 25-34. Balænoptera carolinæ, _Malm_, _Monog. Illust._ t. 44. Balænoptera musculus, _Sars_, _Vid. Selsk. Forhand._ 1865, t. 1, 2, & 3. “Steypireyör,” _Reinhardt_, _Vidensk. Meddel._ 1867; _Ann. N. Hist._ 1868. The Grey Fin Whale, _Turner_, _Proc. Roy. Soc. Edin._ 1869, p. 34 (from Londonderry). Inhab. North Sea. Mus. Hull. The great northern Rorqual of Knox probably belongs to this species. Its skeleton is in the Edinburgh Museum. ** _Vertebræ 58-60. First and second ribs double-headed_ (cf. p. 52); _second cervical vertebræ with a broad lateral process, perforated at the base. Lower jaw compressed, with distinct coronoid process._—Sibbaldius, _Gray_, _l. c._ pp. 114, 169; _Synops. Whales & Dolph._ p. 3. 4. RUDOLPHIUS. Rudolphius, _Gray_, _l. c._ p. 170; _Synops. Whales & Dolph._ p. 3. Sibbaldius, _Lilljeborg_, _Nova Acta Upsal._ vi. 1867. Dorsal fin compressed, falcate, two-thirds the entire length from the nose. Ribs 13·13; first rib short, dilated at the external end. Sternum elongate, not narrow at posterior lobe. Fingers elongate; the second finger rather shorter than the forearm-bone. Scapula very broad, with a large broad acromion process and a moderate coracoid one. 1. Rudolphius laticeps. B.M.