258 



acuminato-oblonga, intus rubra, strigata, nitida ; perist. simplex, 

 rectum, margine columellari sursam sensim dilatato, subappresso . 



Long. 36, diam. 14 mill. 



Hab. Province of Patas, Ancles of Peru (Dr. Farris). 



9. Bulimtjs farrisi, Pfr. (fig. 8). T. anguste umbilicata, fusifor- 

 mi-turrita, solidula, longitudinaliter subremote pliculata et conferte 

 striolata, striis spiralibus levibus decussatula, albida vel rosea, 

 plerumque strigis et maculis pellucentibus fuscis vel rubris sig- 

 nata; spira elongato-conica, apice acutiuscula, crocea ; anfr. 6-^-7 

 planiusculi, ultimus spiram subcequans, vix ventrosior, basi at- 

 tenuatus ; columella superne hvissime plicata ; apertura parva 

 obliqua, acuminata, oblong o-ovalis, intus fusco- crocea ; perist. 

 simplex, rectum, margine columellari superne dilatato, fornicatim 

 reflexo. 



Long. 47, diam. 16 mill. 



Hab. Province of Patas, Andes of Peru (Dr. Farris). 



10. Bulimus clathratus, Pfr. T. compresse umbilicata, fusi- 

 formi-oblonga, tenuiuscula, plicatula, parum nitens, albida, 

 strigis et fasciis angustis interruptis fuscis subclathrata ; spira 

 elongata, apice acutiuscula ; anfr. 8 parum convexi, ultimus | 

 longitudinis vix superans, basi compressus ; apertura vix obliqua, 

 subrhombeo-ovalis ; columella medio leviter torta ; perist. sim- 

 plex, rectum, margine columellari a basi dilatato, superne late 

 patente. 



Long. 30, diam. 1 1 mill. 



Hab. Province of Patas, Andes of Peru (Dr. Farris). 



5. Additional Observations on the Genus Furcella. 

 By Dr. J. E. Gray, F.R.S., etc. 



Sir Everard Home figured, as I stated in my former paper, the 

 fragment of the vaulted continuation of the tube that closes its lower 

 ends, for the shelly valves of the animal. Considering this as an 

 accidental mistake, I took no further notice of it. An eminent com- 

 parative anatomist having observed, — " In the great Teredo arenaria, 

 which lives in soft mud, the valves are wanting, according to Dr. 

 Gray, or their homologues form the convex cap closing the periodi- 

 cal growths of the calcareous tubes " ("Mollusca," in Ency. Britan. 

 353), I feel it incumbent on me to show the reasons why I cannot 

 consider the " convex caps " closing the calcareous tube to be the 

 homologues of the true valves, which, in my paper, I have said are 

 entirely absent. 



First. The caps have the structure, and are continuations of the 

 tube, and have no relation to the usual valves of the Teredo in their 

 form or structure. 



Secondly. The convex caps here referred to are evidentlyidentical in 

 structure and formation with the convex cap that is found on the end 



