. College collection of palaeontology. CEPHALOPODA. No. 173. [463, Cast]. Beloteuthis subcostata, Munst. OssELET. This flattened Calamary receives its gen- eric name from its supposed affinity to the living Squid. The osselet, or rudimental shell, represented in this specimen, is broad and rounded at each end, and in its form approaches nearly to the osselet of the living Sepia of the Mediterranean. It was found in the Lias at Holzmaden, Wurtemberg. Size, 6x3. oa. No. 174. ), Cast]. Belemnosepia Agassiz. An undescribed species. The osselet of this genus is charac- terized by a wide shaft, and
. College collection of palaeontology. CEPHALOPODA. No. 173. [463, Cast]. Beloteuthis subcostata, Munst. OssELET. This flattened Calamary receives its gen- eric name from its supposed affinity to the living Squid. The osselet, or rudimental shell, represented in this specimen, is broad and rounded at each end, and in its form approaches nearly to the osselet of the living Sepia of the Mediterranean. It was found in the Lias at Holzmaden, Wurtemberg. Size, 6x3. oa. No. 174. ), Cast]. Belemnosepia Agassiz. An undescribed species. The osselet of this genus is charac- terized by a wide shaft, and is frequently accompanied by a well- preserved ink-bag. This specimen shows the muscular tissues of the body, fins and arms, with traces of the non-nacreous pen. It is from the Oxford Clay (Middle Oolite), Christian Malford, Eng- land, and is in the private Geological Cabinet of Mr. "Ward, Rochester. Size, 10 x 4. No. 175. [456, Cast]. Belemnites Owenii, Pratt. Guard. The Belemnite is the most complicated of Cephalopod shells. The chambered part, ov phragmocone, is a straight, attenu- ated cone with numerous septa, resembling a pile of , concave towards the base. The whole is enveloped in a sheath; and the two together are lodged in a conical cavity or alveolus, excavated in the base of a long spathose body (corresponding to the mucro of the cuttle-bone), resembling the head of a javelin, whence the generic name. The exterior of this "guard," as it is called, has usually a longitudinal groove; and the septa of the phragmocone are perforated by a marginal siphuncle generally situated on the side nearest the groove; but in certain species, characterized by a flattened guard, the siphuncle is on the opposite side. Besides these fossil parts, there have been found remains of the ink-bag, pen, mantle, mandibles, arms and hooks. The Belemnitidse culminated in the Mesozoic. This specimen, now in the Ward Collection of the University of Rochester, is from t
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1901
