66 M. O. A. L. MORCh's review of the VERMETIDiE. [Feb. 11, 



(Wiener Denkscliriften, 2. Abth. 4. Band. 1 852, p. 135, pi. 10). The 

 latter author has mistaken the ear-capsules for the eyes (Troschel, 

 Jahresbericht, 1852). The spermatozoa (or perhaps the sperma- 

 theose) are described by Siebold (Wirbellose Thiere, p. 344) ; in the 

 same work (pp. 341, 345) are given some observations on the renal 

 and mucous organs. Troschel has represented the teeth of T. 'poly- 

 phragma (Sassi) and T. decussatus (Gm.), vrhich chiefly differ from 

 the teeth of Siphonium nebulosum (Dill.) in having a little tooth more 

 on each side of the rachial plait. The structure of the maxilla is 

 represented by the same author (Gebiss, p. 155, pi. 13. f. 3). 



1. ThYLACODES POIiYPHRAGMA, SaSSi. 



T. solitaria, irregulariter spiralis; anfr. scepe contigui teretiusculi, 

 sutura dilatata, liris parvis longitudinalibus confertis scepe al- 

 ternatim minoribus, confuse ruguloso-granosis, scepe liris validis 

 3-4, nodulis remofis et punctis ferrugineis interpositis ; anfr. 

 ultimus longus, leviter tortus, gracilis ; color sordidus efulvo et 

 flavido albescens. 



Diam. aperturse 14 m. 



Animal capite, pede et limbo pallii purpureis aut purpureo-atris, 

 punctis albis maculisque sulphureis pictum ; reliquum corpus paU 

 lidum albescens; tentacula superiora brevia, crassa, conica, non 

 retractilia, inferiora cylindrica, fliformia, acuminata, pallide 

 annulata (Phil.). 



Sei'pula arcuaria, L. Knorr, Vergn. iv. p. 23, vol. i. t. 29. f. 5, 

 1769. 



Serpula intestina, Salis-Marschlius, Reise, p. 358, 1793. 



Serpula arenaria. Lam. v. p. 



Serpulorbis polyphragma, Sassi, I.e., 1827 j Fer. Bull. 1829; 

 Poli, t. 1. f. 17 (Philippi); Delle Chiaje, t. b1 . f. 1-9. 



Vermetus gigas. Gray, Figs. t. 58. f. 6 (copy). 



Serpiddides arenaria. Gray, Figs. iv. p. 83. 



Vermetus gigas, Phil. Chenu, 111. pi. 4. f. 5. 



Bentalium intestiniforme, Lin. 1859; Hani. MS. of Mus. Ulr. 

 p. 49. 



Serpulorbis gigas, Adams, Gen. t, 39. f. 2^ (optime). 



Var. a. aletes. 



T. lateraliter affixa, fere regulariter spiralis ; anfr. obliqui, con- 

 tigui incumbentes ; anfr, ultimus interdum solutus, longus. 



Vermicularia lineolata, Gravenh. Tergest, p. 57. no. 3 (ex spm. 

 orig.). 



Vermetus gigas, Biv. Nuov. Gen. p. 9, t. 2. f. 1, 2 (Phil.); Phil. 

 Enum. i. p. 170, t. ix. f. 18, and ii. p. 143. 



Serpidcrides arenaria. Gray, Figs. iv. p. 83, t. 57. f. 2 (copy). 



Serpidorbis gigas, Biv. Ad. Gen. i. t. 39. f. 2 (copy) 



ITab. In mare Mediterraneo ; Tarento (^Salis); Sicilia (Phil.); 

 Genoa (Sassi). 



