ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 211 



Albino Salamander.* — A. M. Banta and E. A. Gortner describe an 

 ^Ibinotic (xanthic) larva of Spelerpes bilineatus, which was coloured a 

 uniform yellowish orange, except for the gills, which were reddish from 

 contained blood, and the eyes, which appeared opaque white. So far as 

 the writers are aware this is the only certain wild albino Urodele on 

 record. An albino strain of the axolotl has been reared in captivity for 

 nearly half a century. The cave-inhabiting Proteus anguineus is some- 

 times refeiTed to as an albino, but pigment develops in individuals kept 

 for some months in daylight. 



INVERTEBRATA. 



Mollusca. 

 •y. Gastropoda. 



Spermatogenesis in Columbella.f — Victor Schitz finds that there 

 are two developmental cycles in the spermatogenesis of this Prosobranch, 

 as others have found in Faludina, Cerithium, 3Iurex, Conus, and 

 Vermetiis. There is a typical and an atypical cycle. The mitochondria 

 play an important part in both cycles. They form the tail in the 

 typical cycle, in the other a sort, of envelope for the whole spermatozoon. 

 The idiozome of the atypical series corresponds to the " Nebenkern " of 

 Pulmonata and the internal reticular apparatus of Golgi. The author 

 describes the development of the intra-nuclear rod, the acrosome, and 

 the centrosome and axial filament, in which there is little that is 

 peculiar. 



Float of ianthina.| — V. Baldasseroni refers to the float by means 

 of which this mollusc remains on the surface of the sea and is wafted 

 about. In the female the eggs are enclosed in a capsule suspended to 

 the under-surface of the float. Some observations on lantMna nitens 

 lead the author to think that the float is likewise protective. The shape 

 seen from above is a pointed oval, with a dorsal keel. It has a 

 remarkable resemblance to a small mass of foam, and the eye is easily 

 deceived. This may protect the eggs, but perhaps it also saves the 

 molluscs themselves from sea-birds and other enemies. For the animal 

 hides under the float when disturbed. 



S. Ijaniellibranohiata. 



Entovalva.§ — R. Anthony decribes the remarkable commensal 

 bivalve known as Synapticola perrieri Malard, which should be called 

 Entovalva perrieri Malard. It is found firmly fixed to the posterior 



* Proc. U.S. Nat. Museum, xlviii. (1916) pp. 377-9 (1 pi.), 

 t Arch. Zool. Exp6r., Ivi. (1916) Notes et Revue, No. 2, pp. 32-47 (6 figs.), 

 j Arch. Zool. Exp6r., Iv. (1915) Notes et Revue, No. 1, pp. 5-7 (1 fig.). 

 § Arch. Zool. Exp6r., Iv. (1916) pp. 375-91 (2 pis. and 8 figs.). 



