1861.] M. O. A. L. MOKCh's REVIEW OF THIi VERMETID-E. 311 



Var. «. PERLATA (Thylacodus). 



2'. spiraliter torta, lateraliter affixa ; anfr. ultimus depressms- 

 culus, liris tribus laterulibus validioribus, nodulis validis sat 

 approximatis in seriebus transversis diyestis. 



Hub. St. Thomas (verisiiniliter), 



Var. X. COST ATA (Thylacodus). 



T. ut in prcecedente sed albescens ; anfr. versus suturam dilatati ; 

 nodulis conjluentibus, inde transversim validissime crenato-costatis. 

 Diam. ap. 1| m. ; diam. anfr. penult, circ. 4 m. 

 I£ab. Jamaica, on Chama macrophyUa, Ch. {Oersted). 

 This is the thickest and largest variety of this form. 



3. Vermetus conicus, Dillwyn & Wood. 



Shell subcylindrical, flexnose, and spiral at the base. Tube rather 

 thick, brownish white, and coiled into a conical spire of about 8 

 whorls at the base ; the summit rises about 9 inches from the rock 

 to which the shell adheres ; but the length is probably thrice as 

 great, owing to the coils of the base ; and the diameter of the tube 

 is about 2^2 li'ies (Dillw.). 



La Trompe d' Elephant, Favanne, p. 644 (t. 5. f. C), 1 7bO. 



Serpula, no. 6, Schroter, Einl. ii. p. 557. 



Serpula lumbricalis, var. /j, Gm. p. 3742. 



Tubulus testaceus solitarius anguinus. Mart. i. f. 15. 



Unb. Tlie coast of America, adhering to rocks {Favanne) ; Am- 

 boyna (Rvrnph.). 



The latter locality is added because it is on the plates of the Amb. 

 Rariteitka/mner ; but as it is marked with a number, and not a 

 letter, it was added by Schynvoel, and may be erroneous. Dillwyn 

 evidently did not know this species, but has translated and extracted, 

 somewhat erroneously, the description of Favanue. This is clear 

 from comparing the measures given above with the following sentence 

 of Favanne : — " Son elevation est de plus de trois ponces, mais sa 

 longueur croit a plus de triple." The figure of Favanne is copied 

 from Rumph. t. 42, no. 4* ; but the draughtsman has taken the shell 

 (Turbo 1) on which it is affixed for the first whorls of the Fenaetm. 

 This perhaps has induced Favanue to indicate eight whorls, as re- 

 produced by Dillwyn, although it is also possible that this indication 

 may have been taken from a specimen, as well as the indicated colour 

 and locality. It is the latter circumstances, in connexion with the 

 figure of Martini, which bring me to adopt Dillwyn's name for the 

 following forms, described in the order of their age. 



Var. a, personata juv. (Thylacodus). 



2\ lateraliter affixa, spiraliter regidariter torta, nitida, badia ; 

 anfr. 6-7 contigui obliqui convexiusculi, liris longitudinalibus 

 obsoletissimis, striis incrementi prominentioribus, varicibus 

 lineai-ibus impressis in serie subobliqua dorsali digestis ; anfr. 



* Rumph. t. 41 no. 4, is very likely a Bivonia. 



