1868.] DR. W. BAIRD ON THE GEPHYREA. IQl 



{Anus dorsalis.) 



1. ASPIDOSIPHON MCLLERI. 



Sipunculus {Phascolosomum) scutatus, Joh. Miiller, in "Wieo-m 

 Archiv, torn. xix. p. 166-168, t. 5. f. A-D, 1844; Krohnr in 

 Miill. Archiv, p. 3/1, 1851. 



Aspidosiphon miilleri, Diesing, Syst. Helminth, ii. pp. 68 & 556 • 

 Revis. der Rhyngod. I.e. p. 767, 1859; Quatrefages, Z. e. p. 609^ 

 1865; O. Schmidt, Mitth. Nat. Verein. Steirmark, p. 56, 1865. 



Lesinia farcimen, O. Schmidt, Zeitsch. f. d. gesammt. Natur- 

 wiss. 1854, vol. iii. p. 2, t. 1. f. 3; Diesing, Revis. der Rhyngod. 

 I.e. p. 779, 1859; Quatrefages, I.e. p. 599, 1865. 



Hab. Mediterranean (G;-o/i»za«^A>oAM); Lesina (Sch?nidt) ; off 

 the Shetland Isles (J. G. Jeffreys). B.M. 



Notwithstanding the difference of habitat, I cannot distinguish 

 any marks by which to separate our specimen from the species found 

 in the Mediterranean. It is perhaps less narrow posteriorly ; and 

 the small brown points or papillae, as Diesing terms them, on the 

 body, are smaller than in the species figured by Miiller, The 

 Phascolosoma radiata of Alder, found in the same locality, and de- 

 scribed by him in the 'Annals and Magazine of Natural History' in 

 1860, approaches in some respects this species, and may possiblv be 

 synonymous with it. The description given by Mr. Alder is rather 

 indefinite, and a further examination of fresh specimens is necessary 

 to elucidate the point. 



2. ASPIDOSIPHON STEENSTRUPII. 



Aspidosiphon steenstrupii, Diesing, Revis. der Rhyngod. I. c. 

 p. 767, 1859 ; Icon. Zoogr. Ferdinand. I. Imperatoris ; Quatrefages' 

 I.e. p. 610, 1865. ° 



Eab. Island of St. Thomas, West Indies {Riise fide Diesing). 



3. Aspidosiphon rhyssaspis. 



Aspidosiphon rhyssaspis, Diesing, Revis. der Rhyngod. /. c. 

 p. 768, 1859; Icon. Zoogr. Ferdinand. I. Imperatoris: Quatrefases. 

 I.e. p. 610, 1865. ° 



Hab. West Indies (Suenson fide Diesing). 



A. Aspidosiphon eremita. 



Aspidosiphon eremita, Diesing, Revis. der Rhyngod. /. c. p. 768, 

 1859 ; Icon. Zoogr. Feid. I. Imperat. ; Quatrefages, I.e. p. 61o' 

 1865. "^ ^ 



Hab. Madeira {Dr. Lister) ; inhabiting empty shells of Ditrupa 

 {Diesing). g jyj 



5. Aspidosiphon coyi, 



Aspidosiphon eoyi, Quatrefages, l. e. p. 608, 1865. 

 Hab. Indian seas'! {Quatrefages). 



