447 



dictdaria, are not dealt with at all. ** But the fixed forms 

 frequenting our shores are of more general interest, at least 

 to the amateur naturalist, and this account of them renders 

 fairly easy the identification of the species known at the time 

 the authors wrote." Since their time the Tunicates have been 

 transferred from their original position amongst the invertebrates,, 

 the Molluscoidea, to the XJrochordata, the class containing the 

 lowest type of Chordata. 



Canon Norman writes (Vol. I., pp. x-xi) : "All Hancock's 

 admirable work was eflfected with the aid of such simple means 

 as scalpels and needles ; section-cutting and the use of chemical 

 reagents were in his day unknown. Our author's custom was 

 to gradually and most carefully dissect the animal, and to 

 continually make new drawings as each fresh membrane was 

 removed, thus mastering every detail, and then, aided by the 

 numerous sketches before him, the finished drawing was pro- 

 duced." Of course with the minute forms this was done with 

 the aid of a lens or microscope. The illustrations in the text 

 are mostly reproductions of the earliest published figures of 

 the species described. In addition we have sixteen plates,, 

 mostly coloured, nearly all the figures being from the original 

 drawings by Hancock ; a few, however, are taken from the beauti- 

 fully illustrated monograph by Milne Edwards. By the kind- 

 ness of the editor we are enabled to present to our members 

 a reproduction of one of the plates illustrating this beautiful 

 monograph. The species of Botryllus figured on PI. 23 are as 

 follows : B. smaragdus (1), B. gemmeics (2), B. violaceus (3-5), 

 B. hadlus (6-9). A bibliography of the literature relating to the 

 Tunicates is in preparation by the editor of this work and will 

 be issued to subscribers as one of the volumes of the Ray Society 

 for the current year. 



Modern Microscopy. A Handbook for Beginners and 

 Students. By M. I. Cross and Martin J. Cole, 4th 

 edition, revised and enlarged. ^ X 5| in., xviii + 327 

 pages, 113 illustrations. London: Bailliere, Tindall & Cox,. 

 1912. Price 6s. net. 

 The publishers and authors are to be congratulated on the 



appearance of the familiar "Cross and Cole" in a fourth 



