108 DR.W. BAIRD ON THE GEPHYREA. [Feb. 13, 



? Genus 4. Lacazia. 

 Lacazia, Quatrefages, I.e. 1865. 



Lacazia longirostris. 



Quatrefages, I.e. ii. p. 603, t. 20 (16 bis m textu). f. 18, 19, 



Hab. 



This appears to be a doubtful genus. Certainly the second species 

 quoted by Quatrefages (Lacazia hibernicu) is a true Priapulus, and 

 is nothing more than the Priapulus caudatus (P. ^iieniicMS,M'Coy). 



Order II. GEPHYREA ARMATA. 



Rhynchelidea, Diesing, Syst. 1851. 



Sipunculidea baseostotnata, Diesing, Revis. 1859. 



Gephyrea armata, Quatrefages, I. c. ii. 1865. 



Family I. Sternaspid^. 



Sternaspidea, Quatrefages, I.e. ii. 1865 ; V. Carus. 

 Ster7ias2ndidai, Malmgren, Annulat. polychset. Spitsberg. Green- 

 land. &c,p. 85, 1867. 



Genus Sternaspis*. 



Sternaspis, Otto, Nov. Act. 1821 ; Blainville,Dict. Sc. Nat., 1828 ; 

 Cuvier, R. A. 1830 ; Lamarck, A. s. V. 1838 ; Krohn, Miill. Archiv, 

 1842; Quatrefages, Hist. Nat. Annel. 1865; Malmgren, I.e. 8.5, 1867. 



EcMnorhynchus, sp., Renier, 1807. 



Thalassema, sp., Ranzani, Isis, 1817 ; Schweigger, Handb., 1820 ; 

 Martens, 1824. 



1. Sternaspis scutata. 



Mentula cucurbitacea marina, Janus Plancus, De Concbis minus 

 notis, p. 110, t. 5. App. f. D, E, 1760. 



Echinorhynchus scutatus, Renier, Tavola alfabetica delle Con- 

 chiglie Adriatiche, 1807t (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. Clapai-ede, in liis critique on the classification of the Annelida, especially 

 ■with reference to that of M. Quatrefages, in the ' Bibliotheque Universelle,' 1867, 

 and translated in the ' Annals & Magazine of Nat. Hist.' for November 1867, 

 expresses his concurrence with Oken, Siebold, Max Miiller, and Malmgren in 

 their opinion that the genus sternaspis, belongs to the true Annelida. He also 

 says that it is astonishing " tliat in the year 1865 M. de Quatrefages, in assign- 

 ing 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 MM. Krohn and Max Miiller, and more especially as neither 

 Bianchi (Janus Plancus), Kanzani, 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). 



I retain here the genus Sternaspis amongst the G-ephyrea, 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. 



