330 Miscellaneous, 



lingual apparatus. The trunk and the tongue are thus clearly di- 

 stinguished by the nature of the nerves which animate them. 



Reproduction. 



Hermaphroditism ; fundamental and accessory glands, as well as 

 the other parts, analogous in structure and arrangement to those 

 found in most Gasteropoda. 



Special Secretions. 



The skin is filled with triangular spicula, or with oval calcareous 

 particles. The latter occur (although in form less regular than in 

 the skin) in the walls of the digestive tube, and even in the neuri- 

 lemma of the nerves. 



The corpus Bojani is placed to the right of the mass of the vis- 

 cera, and is entirely internal ; it turns under the branchia by a 

 distinct pore, which is easily seen. This forbids the supposition 

 which might perhaps be raised, that the excretory pore of the corpus 

 Bojani has been mistaken in this case for the internal orifice of the 

 circulation. In Pleurobranchus testudinarius I have met with 

 numerous calculi in the interior of its tissue. With nitric acid and 

 ammonia they gave the well-known purple-red colour characteristic 

 of uric acid. This is a fresh proof, in addition to so many others, 

 that this body may be regarded as a kidnev. — Comptes Rendus, 

 June 27, 1859, p. 1155. 



Note on Cyclostoma articulatum. By S. P. Woodward, F.G.S. 



This land-snail is peculiar to the Island of Rodriguez, and belongs 

 to the subgenus Tropidophora (Troschel), characteristic of the 

 Mascarene Islands. Numerous examples were collected in February 

 1858 by the late Madame Ida Pfeiifer, who conveyed them to the 

 Mauritius, where they continued active, but took no food during a 

 stay of two months. Three individuals remained alive after the 

 voyage to England, which occupied ten weeks ; and several others 

 were sufficiently preserved for examination. They were brought 

 over packed in paper and rags, in a tin pot with a lid, and were not 

 taken out until a fortnight after their arrival. One of these snails 

 lived for some months under a bell-glass with moss and ferns, and 

 afforded frequent opportunities for examination. The animal was 

 of a pale buff colour, with darker tentacles and muzzle ; the tentacles 

 were acute, rugose, and slightly annulated ; the muzzle annulated, 

 grooved beneath, and bilobed at the end, which was constantly used 

 in walking. The foot was ample, with a deep central groove dividing 

 it into two lateral elements moved alternately in walking. When it 

 retired and closed its shell, it still adhered, and sometimes became 

 suspended, by a tenacious thread of mucus. 



Madame Pfeiffer also brought home specimens of Cyclostoma ca- 

 rinatum and C. (^Otopoma) Listeri, from Mauritius, which were in a 

 tolerably fresh state. The lingual dentition of these species differs 

 slightly from that of C. articulatum. — Proc. Zool. Soc. May 21, 

 1859. 



