JOURNAL OF CONCHOLOGY. 17 



come more pronounced, the mantle-collar becomes swollen and 

 reflected over the peritreme of the shell, the under surface of 

 the foot becomes of an opalescent white colour, the foot is ex- 

 panded or complicated, and, at last, the retractor muscles of the 

 tentacles lose their contractility and become elongated to their 

 normal length, the ommatophores become completely everted, 

 the sensitiveness of the cornea is lost, and the animal dies. The 

 autopsy made immediately after death (April 30th) revealed the 

 following : — The buccal mass was swollen, the mantle-cavity was 

 tensely distended with fluid, the coelum was distended with 

 fluid, the whole enteric tract was swollen, the heart and venous 

 sinuses were tense and swollen with diluted blood, the digestive 

 gland [gland of mid-intestine (" Mitteldarmdriise ") of Frenzel] 

 was enlarged, the dart-sac was enlarged and more clavate than 

 pyriform in shape, the follicles of the hermaphrodite gland were 

 swollen, and the male portion of the common duct was dis- 

 tended, but the adherent female portion quite normal. All the 

 other organs were normal in size and shape. 



From a full consideration of the above observations it is 

 evident that the ultimate cause of death is not asphyxia, since 

 all respiratory movements totally cease for many hours before 

 death ; but that, although asphyxia no doubt is a great factor, it 

 is rather the absorption of water by the various tissues of the 

 body and the consequent hindrance, and, at last, cessation of all 

 vital functions. 



Note on Patula cooperi Binney. — The young of 

 this species are keeled, and it is an interesting fact, apparently 

 unrecorded, that the epidermis is raised into a number of spiral 

 ridges, which are sometimes even ciliate, especially that on the 

 keel. I found this condition best developed in examples from 

 near Brush Creek, Custer Co., Colorado, at 10,000 ft. alt. — 

 T. D. A. CocKERELL, Wcst CUff, Colorado, Oct. 28th, 1888. 



