1899] EMBRYOLOGY OF INVERTEBRATES 469 



peculiar appearance to some eyes, though not to readers of Natural Science. 

 We may also note " oral and anal apertures " for mouth and anus, " Phoronidae " 

 for Phoronidea, " epistomal " for epistumial, " endosternum " for endosternite, and 

 " intestineless " for anything more euphonious. Such terms as " unicorneal " and 

 " primary coelom " also require amending. 



The illustrations are numerous and good, and in instances of the contrary, 

 such as Fig. 8, Mr. Woodward's notes save misunderstanding. In this connec- 

 tion, however, the caricature of Cejjhalodiscits on p. 89 should have been 

 excised. 



In making these critical suggestions we do not wish to lose sight of the out- 

 standing merit of the work and the great benefits which the translator and 

 editor have bestowed upon British zoologists by their labours, which, consider- 

 ing the nature of the task before them, could hardly have been more satis- 

 factorily accomplished. We heartily congratulate them on the production of 

 this volume, which must tend to make " Korschelt and Heider" more readily 

 accessible to a number of embryological workers who have not the time, and in 

 many cases the training, to follow the authors in the original. 



A. T. Masterman. 



THE GEOLOGY OF SOUTH AFRICA. 



Bibliography of South-African Geology. Compiled by H. P. Saunders, 

 Secretary to the Geological Commission. 8vo, 56 pp. South- African 

 Museum, Cape Town, 1897. 



Cape of Good Hope Geological Commission, Department of Agriculture. 

 First Annual Report (for 1896). Large 8vo, 52 pp., and 2 plates, 

 1897. Second Annual Report (for 1897), 86 pp., and 2 plates. 

 Richards and Son, Cape Town, 1898. 



We gladly welcome these first-fruits of the Geological Survey of the Cape 

 of Good Hope Colony, established in 1895. The official work of Dr. G. S. 

 Corstorphine, and his assistants, A. W. Rogers and E. H. L. Schwarz, has been 

 especially directed to the elucidation of the structure and physical features of 

 the south-western part of Cape Colony. This includes the Divisions of Robert- 

 son and Worcester, and parts of Stellenbosch, Prince-Albert, Ladismith, and 

 Swellendam ; or, in other words, " from the west coast eastwards to the Gamka 

 River, and from the Zwartebergen, on the north, to some distance south of the 

 Langebergen ; while the Malmesbury district has been completed north to 

 St. Helena Bay." This area exhibits the following formations in ascending 

 order : — 



1. Malmesbury Beds. — Non-fossiliferous slates, phyllites, mica-schists, and 



quartzites, with intrusive granite, quartz-porphyry, and diabase. 

 (Marked unconformity with the next exists.) 



2. Table-Mountain Sandstones. — ^Sandstones and quartzites, with occasional 



shales. 



3. Bokkeveld Beds. — Fossiliferous shales, sandstones, and greywackes. 



4. AVitteberg Beds. — Mainly quartzites (often with alga-like markings). 



5. Dwyka Series. — Conglomerate and interbedded shales. 



6. Ecca Beds. — Shales and sandstones, with occasional plant-remains. 



7. Superficial deposits. — Gravels, sands, conglomerates, sandstones, and lime- 



stones. 

 The Surveyors have arrived at some new and valuable conclusions, determin- 

 ing the exact relationships of the Malmesbury and Ecca Beds in the Worcester 

 Division, and of the Table-Mountain Sandstone in the Langeberg and Zwarte- 

 berg ranges. The great amount of folding to which the strata have been sub- 

 jected, particularly in the mountains above mentioned, and in the Hex-river 

 mountain, and the extensive dislocation, such as the "Worcester-Robertson" 



32 NAT. SC. VOL. XIV. NO. 88. 



