BIBLIOGRAPHY. 377 



esontropia, C. gaskoi/ti. etc. ; very fine C. erosa var. neb/iles, C. lynx var. willianisi, 

 and C. cntenta var. coloba of a peculiar greenish colour on die dorsal surface, and 

 remarkably bright-orange at the base, all from Aden. The most important exhibit 

 was a variety of C. helvola, which corresponds exactly to the description and figure 

 of the newly-described C. kaitilani of Mrs. Agnes Kenyon, Hawaii (cf. Pioc. Mai. 

 Soc, vol. 4, p. 68). In the opinion of many students of the genus this is a mere 

 colour variety, inseparable from C. helvola, which in some of its forms possesses the 

 "twin callosities" and tooth arrangement of what should be designated as C. helvola 

 v. kauilani. 



BIBLIOGRAPHY. 



(limited to works received by the society's librarian). 



A Monograph of the Land and Freshwater Mollusca of the British Isles, 



by J. W. Taylor. Part vi., pp. 321-384. 



The present fasciculus continues the discussion of the secretory organs, left un- 

 finished in the previous one, and then gives a short account of the structure and 

 formation of pearls. Pigment cells and colouring are next dealt with, and an inter- 

 esting account is given of the effects upon them of age, food, cold, and heat. 

 "Protective resemblance naturally follows, and a large collection is given of instances 

 in which this phenomenon has been more or less clearly demonstrated in the Mol- 

 lusca, one of the most striking being that of Helix fusca to the seed vessels of the 

 red campion. We miss, however, a reference to the likeness of H. cant tana to 

 the "fading leaves of the colt's-foot with their autumnal patches of invading fungoid 

 growths," recorded by Mr. Crowther in this Journal (vol. 8, p. 161). 



The renal organs, pericardial gland, and muscles next receive attention, and 

 under the head of locomotion we have a collection of statistics culled from scattered 

 writings on the speed and strength of different species. The latter half of this part 

 is occupied by a detailed and fully-illustrated account of the reproductive organs, 

 concluding with a brief notice of the embryology. All the important variations in 

 these organs are figured, including the principal types of the spicuhim a ///oris. 

 We notice in this section a plentiful terminology of Greek origin, and rather regret 

 that we are not told which of these names, if any, are here proposed for the first time. 



Our members will be glad to notice the announcement on page ii. of the cover 

 that " the present part concludes the consideration of the animal and its shell," and 

 that with another "dealing succinctly with the geographical distribution, geological 

 history, parasites, uses, etc., with index and glossary," the first volume will come to 

 an end, and will congratulate Mr. Taylor on being so near the completion of the 

 first half of his arduous task. 



The Nautilus, vol. 14, nos. 2-4, June-Aug., 1900. 



"Aestivation of Epiphrag/nophora Traskii in Southern California," by Mrs. M. 

 B. Williamson. "A new species of Lima" [Z. hamlini, Los Angeles, Cal.], by 

 W. H. Dall. "A revision of the Physce of north-eastern Illinois" [4 spp. with figs.], 

 by F. C. Baker. 



" In search of Polygyra pilsbryi" [P. pilsbryi n.sp., Polk Co., Arkansas], by 

 J. H. Ferriss. "Notices of some new Japanese mollusks" [Bulitni/ius hirasei, 

 B. callistoJerma, B. extorris v. omiensis], by H. A. Pilsbry. " Supplemental note 

 on Planorbis corpulentis Say," by Bryant Walker. 



"A new Murex [M. petri] from California," by W. PI. Dall. "A new Lamp- 

 sills [L. siinpsoni, fig.] from Arkansas," by J. H. Ferriss. "Notices of new 



