52 
REVIEWS AND EXCHANGES. 
British Tunicata. Ah Unfinished Monograph. Vol. II. by the late Joshua 
Alder, and the late Albany Hancock, edited by John Hopkinson. 5^ inches 
X 9 inches. XXVIII. + 164 pp. with 30 plates (the majority in colour) 
and 61 figures in the text. Ray Society. Price 25s. net. 
In this volume, issued to the subscribers to the Ray Society for 1906, a con- 
sideration of the genera Ciona and Corolla completes the account of the ‘‘sea 
squirts ” belonging to the family Ascidiadre. The species of three other families 
together referable to ten genera are also enumerated and described. That Mr. 
Hopkinson’s position as editor has been no sinecure is shown by the hundreds of 
references which he has added to the synonymy and the many records and 
P'lGUKK 17 . — Mantle of Figure 18. — Test of 
Ciona inlestinalis. Nat. size. Molgula siphonata. il nat. size. 
v.t.. Blood vessel leading to the test. 
(From “ British Tunicata,” by the courtesy of the Ray Society.) 
observations which he has supplied. He felt bound to relax his rule not to 
include any notice of work after the year 1870 in the case of the genus Styelopsis, 
Traustedt 1882, as Alder and Hancock had decided to place some of the forms 
which have since been put under Styelopsis in a new genus, and had left a 
blank in their MSS. for a name. 
The coloured plates are very successful and the arrangement whereby each 
plate is faced by its description is admirable. By the courte.sy of the Ray 
Society we are able to reprint two of the figures from the text (see figs. 17 and t8). 
Most interesting are the brief accounts of the lives of Alder and Hancock, 
written by Canon Norman and the late Dr. Embleton, which are prefixed to the 
systematic portion of the work. 
