1862.] M. o. A. L. morch's review of the vermetid.e. 11 



17. Thylacodes michaxjdii, Rousseau. 



Vermetus micJiaudii, Rouss., Chenu, 111. pi. 2. f. 5. 



Hab. ? (3Ius. Cuminff). 



Diam. circ. 6 m. 



In Mr. Cuming's collection is a specimen labelled " Philippines/* 

 which seems to correspond pretty well with the figure quoted ; it has 

 the same annular ribs and longitudinal striae, but is nearly covered 

 over with a chestnut-brown colour, showing some darker longitu- 

 dinal bands. The specimen is singular from possessing a long varix 

 maniciformis, with about 12-13 false septa (analogous to those of 

 the water-clam), proving that the animal has changed the direction 

 of its tube at least as often as indicated by the septa. 



18. Thylacodes porites, Rousseau. 



T. tenuis, repens, teres, longitudinaliter subtilissime striata ; strice 

 incrementi ohsoletissimcs, confertissimcB ; sulci incremetifi regu- 

 lariter remoti, interstitiis convexiusculis ; faucihns scejpe fia^ 

 vescentibus. 

 Diam. 3|~4 m. 

 Ve7'metus porites, Rouss., Chenu, 111. pi. 2. f. 3. 



Hab. ? On a Porites, according to the specific name j but 



I believe the coral represented is a Palmipora, Blainv., as in my 

 specimen. 



This species is exceedingly like T. decussatus, var. intermedia, if 

 it really be different. It is chiefly distinguished by the annular, 

 equidistant, rather remote annular sulci, the interstices of which are 

 very slightly convex and decussate. This shell is the only one I 

 know which seems to approach to Gualtieri's tab. 10. f. L, L. 



19. Thylacodes protensus, Gm. 



T.nitida, Iceviuscula, annulatim plicata, finem versus parum atte- 

 nuata, laetea, exalbida aut ccerulescens, calami ansei-ini crassitie 

 aut tenuiore, tota porrecta, aut partimflexuosa (Gm.). 



Tubidus cylindricus, subfiexuosus, anguinus. Mart. i. pp. 24, 46, 

 f. 12a. 



Serpida protensa, Gm. S. N. p. 3744. no. 20. 



Hab. In mari Indico et Americam alluente {Gm.). 



Gmelin has taken his description from Martins, but the locality 

 from Rumphius and Davila. This shell is perhaps identical with 

 the preceding and following species. It is chiefly from the ex- 

 pressions " T. nitida" et " cserulescens," that I refer this species 

 to the Vermetidce. 



20. Thylacodes rumphii, Blainv., 1828. 



" Coq. tubulaire, irregulierement contournee, si ce ii'est a sa base 

 qui s'avance presque a droite ligne, elegamment treillisee dans tout 

 son etendu sans carcne ; de couleur roussatre. Je distingue cette 

 espece d'aprcs un individu de ma collection, dont j'ignore la patrie, 

 et qui certainement ne peut etre reuni au S. protensa, L&m."— Blainv. 



