172 CURRENT LITERATURE. 



specimens which represent merely individual or racial variations." With reference 

 to the resemhlance of Flacostylus to I'artula. noticed by Kobelt and others, Dr. 

 Pilsbry regards it as quite superficial, and does not agree that it indicates the 

 relationship claimed. We should much have liked to see some detailed discussion 

 re the affinities of this interesting group, as it is, they are dismissed with the bald 

 statement "The affinities of the group are nearest to Bothriemhryon." We are not 

 alone in regretting that in a great work of this kind such a feature should be so 

 curtailed or omitted, a shortcoming which has ever characterised the chief mono- 

 graphs. 



The following new species and varieties are described : Bothriemhryon physoides 

 V. humilis, B. gunni v. hrachysoma, Flacostylus Jibratus, Marts., v. strigatus, P. 

 hcterostylus (New Hebrides), P. garrctti (Habitat unknown, Viti group?) — W. E. C. 



Sarasin, P. and F. — Die Land-Mollusken von Celebes. Demy 4to, pp. viii + 

 248, Tfn. I — 31. Wiesbaden: 1899, C. W. Kreidel. 



The Drs. Sarasin are to be congratulated on the appearance of the second volume 

 of their studies on the Mollusca of the Celebes. We had occasion to speak very 

 highly of the previous volume treating of the freshwater species, and the present 

 volume is fully equal, if not superior, to it. So far as printing and plates are con- 

 cerned, no previous work which we can call to mind has reached the standard here 

 attained. Indeed, plate 18, containing twenty coloured figures of the shells of 

 Xesta, is, in our opinion, the finest coloured illustration of shells yet produced. 



Apart from the great value of this work as a faunistic record, the two most 

 notable features are, the invaluable observations upon the various forms or subspecies 

 of certain molluscs, and the very important chapter treating of the anatomy and 

 development of Vaginulus, and the anatomy of the genus Atopos. 



After deducting the varieties, 170 species are enumerated, of which about one 

 third are new, in addition to many new subspecies and varieties. Of these 140 are 

 endemic, while 37 also occur in districts outside the Celebes. Various species are 

 divided into "forms," the exact value of which varies in different cases; variety and 

 subvariety would perhaps be preferable terms in some cases, whilst in others, distinct 

 geographical races are indicated, e.g., Obba listeri, Gray, forms vwngondica, 

 tominica, matinangensis, and buolica. . 



Space will not permit an enumeration of all the new species, but some of the 

 more important may find mention. There are seven new species of slugs described 

 belonging to the following genera: Vaginulus 2, AtojJos ^, Philomycus i. In the 

 ^'anina group there are many interesting new species of which we may cite Xesta 

 j)orcellanica, ardcns, fenncmae, Hcmipleda vcbcri, wichmanni, and hraam-morrisi. 

 Amongst others are Cydotus jcUcsmae and boneyisis, Slreptaxis nctutihis, and 

 celebicus, a series of " forms " of Obba listeri, Gray, and 0. papilla, Miill. All the 

 new species, <S:c. , are figured, in addition to many others. 



To the authors, publisher, and all who have helped to produce this beautiful 

 work, we offer our warmest congratulations. — W. E. C. 



PfeiffeP, W. — Die Gattung Triboniophorits. Zool. Jahrb. (Abth. f. Morph.), 

 1900, Bd. xiii, pp. 293 — 358, Tfn. 17 — 20. 



In 1S98 Dr. Plate gave a valuable account of the anatomy of the genus Janella 

 and Dr. Pfeiffer has now supplemented this by his study of the genus Aneitca, 

 or as he prefers to term it Trihoniophorus. The specimens selected for this investi- 

 gation were three from Brisbane, which belong to a species hitherto undescribed, 

 and which is now named T. brisbanensis. This species has been carefully compared 

 with A. (jraffci, Humb., and its varieties schutei, Ivfst., and krefftii, Kfst., the three 

 remaining species A. macdonaldi, Gray, A. hirudo, Fisch., and A. modesta, C. 

 and F. , do not seem to have received attention. 



The chapter on the Literature and Habits is very far from complete. The 

 general anatomy shows a close relationship to Janella. The generative organs 



