ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 51 



the great development of papillae in a double or triple series on the 

 dorsal surface, which seem to serve as fixing organs. It is only the 

 seventh Triclad found on the Mediterranean shores. 



New Nemerteans.*— M. Oxner describes two new species which he 

 has found at Roscoff — Amphiporus martyi sp. n., a very transparent 

 form which lives along with Linens ruber ; Prosorochmus delayei sp. n., 

 which is viviparous and hermaphrodite. 



Incertae Sedis. 



Development of Ribs in Brachiopods.f — S. S. Buckrnan discusses 

 the development of the ribbed stage in Gincta and Eudesia, and shows 

 that there are various methods by which "similar looking ribbed forms" 

 have been evolved from " similar looking smooth forms." ' 



It may be of use to quote the general introduction to his study : 

 " The test ornament of Brachiopods is found in three main phases — 

 smooth, ribbed, and spinous. (A striate stage is sometimes interposed 

 between the smooth and the ribbed, but not always.) These three 

 phases are in this anagenetic sequence to one another : in relation to 

 its nearest allies, a costate species of a given series is more advanced 

 than a smooth one of that series, and a spinose one still further than a 

 costate. There are catagenetic developments also in reverse order : 

 in certain Productids the costate stage follows on a spinose ; in Aran- 

 thothyris there are certain cases of the spinose ontogenetic stage being 

 followed by a smooth. If, however, the catagenetic phases be put aside 

 for the present, it may be said that the state of external ornament — 

 smooth, costate, spinose — indicates the position of a Brachiopod as more 

 or less advanced than its fellows." The author gives an interesting table 

 showing sequences of developmental phases of test ornament, in the 

 one case subsequent to Gincta, in the other case prior to Eudesia. 



Rotiform Bryozoa of the Isle of Wight.} — J. W. Gregory describes 

 Bicavea rotaformis sp. n., which occurs at the base of the cretaceous 

 Holaster planus zone in the Isle of Wight. It consists of a wheel-shaped 

 body borne on a narrow cylindrical stem. Its nearest allies are some 

 specimens from the Danian Chalk of Faxoe, described as Radiopora 

 urn nl a var. stipitata by Pergens and Meunier in 1887. 



Growth of Tendra zostericola.§ — M. Bogolepow describes the growth 

 of colonies of this Bryozoon on the glass sides of an aquarium. The 

 original " cell " or oozoid formed a chain of blastozoids ; blastozoid buds 

 appeared which formed the beginning of an axis or of axes of the 

 second order ; and so on. Gradually a thick crust resulted. The author 

 watched the processes of degeneration, the formation of " brown bodies," 

 and the process of restoration, and he gives an account of the various 

 appearances presented by the living colony. 



* Arch. Zool. Exper., vii. (1907) Notes et Revue, No. 3, pp. lix.-lxix. (6 figs.). 



t Quart. Jouru. Geol. Soc, lxiii. (1907) pp. 338-43 (1 pi.). 



\ Geol. Mag., iv. (1907) pp. 442-3. 



§ Zool. Auzeig., xxxii. (1907) pp. 305-16 (7 figs.). 



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