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Show 108 DR. W. BAIRD ON T H E GEPHYREA. [Feb. 13, ? Genus 4. LACAZIA. Lacazia, Quatrefages, l.c. 1865. LACAZIA LONGIROSTRIS. Quatrefages, l.c. ii. p. 603, t. 20 (16 bis in textu). f. 18, 19, 1865. Pfab. ? This appears to be a doubtful genus. Certainly the second species quoted by Quatrefages (Lacazia hibernica) is a true Priapulus, and is nothing more than the Priapulus caudatus (P. hibernicus, M'Coy). Order II. GEPHYREA ARMATA. Rhynchelidea, Diesing, Syst. 1851. Sipunculidea baseostomata, Diesing, Revis. 1859. Gephyrea armata, Quatrefages, I. c. ii. 1865. Family I. STERNASPIDAE. Sternaspidea, Quatrefages, l.c. ii. 1865 ; V. Carus. Sternaspididee, Malmgren, Annulat. polycheet. Spitsberg. Greenland. &c. p. 85, 1867. Genus STERNASPIS*. Sternaspis, Otto, Nov. Act. 1821; Blainville, Diet. Sc. Nat., 1828 ; Cuvier, R. A. 1830 ; Lamarck, A. s. V. 1838 ; Krohn, Miill. Archiv, 1842; Quatrefages, Hist. Nat. Annel. 1865; Malmgren, l.c. 85,1867. Echinorhynchus, sp., Renier, 1807. Thalassema, sp., Ranzani, Isis, 1817 ; Schweigger, Handb., 1820 ; Martens, 1824. 1. STERNASPIS SCUTATA. Mentula cucurbitacea marina, Janus Plancus, De Conchis minus notis, p. 110, t. 5. App. f. D, E, 1760. Echinorhynchus scutatus, Renier, Tavola alfabetica delle Con-chiglie Adriatiche, 1807"f (asquoted by Ranzani in his paper in 'Isis'). Schreberus bremseri, Renier, Catalog. Vienn. (? MS.), 1807? fide Otto et Blainv.f Thalassema scutatum, Ranzani, Isis, 1817; ib. xii. pp. 1457-60, * M . Claparede, in his critique on the classification of the Annelida, especially with reference to that of M . Quatrefages, in tbe ' Bibliotheque Universelle,' 1867, and translated in the ' Annals & Magazine of Nat. Hist.' for November 1867, expresses his concurrence with Oken, Siebold, M a x Muller, and Malmgren in their opinion that the genus Sternaspiis belongs to the true Annelida. He also says that it is astonishing "that in the year 1865 M . de Quatrefages, in assigning to Sternaspis a place among the Gephyrea, should still mistake the head of these animals for the tail, without taking any notice of the beautiful anatomical investigations of M M . Krohn and M a x Muller, and more especially as neither Bianchi (Janus Plancus), Eanzani, nor Delle Chiaje had fallen into the error of Oken and Otto, now corroborated by the authority of M . Quatrefages " (Ann & Mag. Nat. Hist. 1867, p. 361). v I retain here the genus Sternaspis amongst the Gephyrea, as, in outward form at least, it seems to be more nearly allied to this group than to the true Annelids. t These works I have not been able to see. |