618 



COMPARATIVE ANATOMY 



Turritellidce, 6 

 Tylaster, 297 

 Tylodina, 10 



UlNTACRINUS, 309 



Umbrella, 10 

 Lhnbrellida:, 10 

 Uncini, 182 

 Unio, 17 



Margaratiferus 

 35 



pinctorum, 17 

 Unionidcc, 17 

 Unionince, 50 

 Uniophora, 299 

 Urechinus, 293 

 Urns, ciliated, 437 

 Utriculus, 180 



VAGINULW^E, 8 

 Vaginulus, 45 

 Valvaster, 299 

 Valvatidai, 6 

 Veliger, larva, 1, 257 

 Velum, 250 

 Veneracea, 18 

 Venericardia, 17 

 Venerida:',, 18 

 Venus, 18 



(Margaritana), 17, 



Vermetidas, 6 



Venmtus, 108, 248 



Vertebral ossicles (Oph.), 356 



VerticordiidcK, 51 



Vitrina, 8 



Volutidcc, 6 



Vulsella, 17 



WACHSMUTH and Springer's rule, diagram, 



374 

 Wandering cells (amoebocytes) (Echin.), 



415 

 Water lung (Hoi.), 487 ; pore (Scapli.), 



221 ; pores (Crin.), 377 



21 



409 



itl X, S 



, 4 



, 998 



Zotoasteridce, 298 

 Zygoueury, 137 



, a])ical system, 326 



THE END 



Printed by R. & R. CLARK, LIMITED, Edinburgh. 



