Miscellaneous. 465 



Arrested Development of the Tadpole of the Comtnon Frog. 

 To the Editors of the Annals of Natural History. 



British Museum, Nov. 21, 1856. 

 Gentlemen, — Not being aware if the arrested development of 

 the tadpole of the common Frog is of frequent occurrence, I have 

 forwarded you the following instance, should you think it worthy of 

 notice in the ' Annals.' 



Early in the spring (about the latter end of March) I placed some 

 frog spawn in a glass containing ValUsneria and Confervse, and in 

 due time I had a little colony of about two dozen tadpoles, most of 

 which gradually grew into frogs, with the exception of two indi- 

 viduals, whose further progress was arrested after having attained a 

 middling size ; their hind legs commenced budding, but made no 

 progress ; the fore legs were never developed. They were active and 

 lively during the summer, but in the autumn became sluggish, 

 moving hut little about the glass, mostly lying in the Confei-vse, 

 seldom at the bottom. Their inactivity gradually increased until 

 their death. One died in the latter part of October, the other in 

 the second week of November. 



I am, Gentlemen, yours obediently, 

 W. Davies. 



List of Species of Mollusca obtained hy Prof. GooDSiRyrowi 



Spitzbergen. By R. M'Andrew, Esq. 

 Terebratulina caput-serpentis. Toldia navicularis, Gould ? 

 Terebratella Spitzbergensis, Pecten Islandicus, var, (small 



Dav. and thin). 



Crania anomala (dead). Groenlandicus. 



Astarte elliptica, Br. Dentaliutn, sp. ined. 



crebricostata, Forbes. Patella (Lepeta) caeca. 



Warhami, Hancock ? Cancellaria {Admete) viridula, 



Leda candata. O. Fabr. 

 pernula {rostrata. Mart . ) . 



Note. — This list is the more interesting since visits to Spitzbergen 

 have become so rare. Capt. Phipps enumerates the following spe- 

 cies in his 'Voyage towards the North Pole,' Lond. 1774 : — 



Ascidium rusticum and gelatinosum. 



Synoecinm turgens, Phipps. 



Clio helicina and liinacina (Arctic Sea generally). 



Chiton ruber. 



Mya truncata. ~j 



Saxicava arctica. I « u tt u 



„ . J , > Smeerenbera; Harbour. 



Bnccinum undatum, var. f ® 



Turbo helicinus. J 



Four other Spitzbergen shells are mentioned by Dr. Wm. Leach 

 in the Appendix to Sir John Ross's 'Voyage of Discovery,' ed. 2. 

 8vo, Lond. 1819. The specimens were probably obtained by Capt. 

 Buchan, as a few Spitzbergen shells are in the Museum cases with 

 his name attached : — 



Ann. S^ Mag. N. Hist. Ser. 2. Vol. xvi. 31 



