52 



FAMILY OF BUCCINOIDES. 



LESSON IV. 



Family of Buccinoides. — Buccinum — Bucdnum properly so 



called — Harpa — Purpvra — Cassis — Cerithium — Murex — 



Stromhus — Volvta — Ovula — Cyprcea — Convs. 

 Family of Pectiivibranchiata Capuloida. — Pileopsis — 



Hypponyx — Crepidula — Calyptrcea — Siphonaria — Siga- 



retiis. 

 Order of Gasteropoda Tubulibranchiata. 

 Order of Gasteropoda Scutibranchiata. — Haliotis — Fis- 



surella — Emarginula. 

 Order of Gasteropoda Cyclobranchiata. — Patella—- 



Chiton. 

 Order of Gasteropoda Inferobranchiata, 

 Order of Gasteropoda Tectibranchiata. — Pleurohran- 



chus — Aplysia—Dolahella — Bullea — Bulla. 

 Order of Gasteropoda Nudibranchiata. — Eolidia — 



Glavciis. 

 Order of Gasteropoda Heteropoda. — Carinaria. 

 Class of Mollusca Vt^vlofoda, — Clio horealis. 



1. In the Family of Buccinoides, the shell is spiral, and in 

 its aperture, near the extremity of the columella, there is a canai 

 or notch, serving for the passage of the syphon or respiratory 

 tube {fig. 56), which is formed by a fold of the mantle, ana 

 destined to afford the animal the power of breathing, without 

 going out of its shell. This family is divided into three tribes, 

 namely : Buccinum, Murex, and Angiostoma. 



2. The Tribe of Buccinum comprises all the Buccinoides in 



which the shell is with- 

 out a plica (fold) in its 

 columella, but is fur- 

 nished with a notch or 

 short canal inflected 

 towards the left, and its 

 aperture is very large. 

 The foot of these mol- 

 lusks is generally of 

 moderate length, and 



The mantle is unprovided 

 with fringe, and is" prolonged anteriorly into a long canal, which 



Fig. 56.- 

 rounded in front {figs. 33 and 34.) 



1. What are the characters of the shell in the family of Buccinoides ? 

 Into how many tribes is this family divided ? 



2. How is the tribe of Buc'cinum characterized ? (Buccinum, Latin, a 

 trumpet.) 



