204 



ASCIDIANS OF GUERNSEY. 



needed and is sure to reveal many additional species, while 

 tow-netting ought to add new free-swimming forms. 



In the following list will be found records of 76 species, 

 comprising Canon Norman's list of simple forms and the result 

 of my own collecting. 



In conclusion I wish to return my thanks to Dr. H. 

 Fleure and Mr. J. Sinel for their kindness in identifying a 

 large number of my specimens, and to Mr. F. Wright for help 

 in collecting. To Prof. Herdman I am indebted for very 

 kindly sending me his " Revised Classification of the Tuni- 

 cates," which has been of the greatest assistance to me. Any- 

 one wanting a good account of the Tunicates, their habits, 

 structure and life history, is advised to read Prof. Herdman's 

 " Ascidia," which is No. I. of the Liverpool Marine Biological 

 Committee's memoirs. 



TUNICATA. 



Order I.-Ascidiacea. Sub-Order I.— AscidijE Simplices. 

 Family I.-MOLGULID^:. 



Solitary, often not fixed ; branchial sac longitudinally folded ; branchial 

 orifice 6 lobed, atrial 4 lobed ; test usually sandy ; stigmata more or less 

 curved, usually in spirals ; tentacles compound. 



Eugyra glOOOSa {Han). Dredged off Fermam (Jeffreys and Norman). 



Gonads single, crossing over intestinal loop. Body entirely covered with 



sand. Test soft, thin and fibrillated 

 Molgula impura [Heller), Channel Islands (Sinel). Havelet and Roc- 



quaine Bays (Sharp). Six folds on each side of branchial sac and small 



papillae on each edge of the stigmata. 

 M. OCUlata {Forbes). Guernsey (Norman). Siphons retracted between 



folds of test ; no sand between siphons. 

 M. eomplanata {Aid. and Han.) Guernsey, dredged adhering to a dead 



limpet shell (Jeffreys and Norman) . 

 M. ineonspieua {Aid. and Han.) Guernsey, dredged (Jeffreys and Norman). 

 Family II.-CYNTHIIDiE. 



Solitary, fixed, test usually leathery. Branchial and atrial apertures 



both 4 lobed. Stigmata straight. Tentacles simple or compound. 



Mieroeosmus elaudieans {Sav.) Guernsey (Alder). Test tough, wrinkled 

 and red. Branchial orifice striped rose and yellow. 



Cynthia squamulosa {Aid.) Guernsey (Alder). Body oval, pink tinged 

 with lilac. Inner surface of test soft and white. 



C. mOPUS {Forbes). Guernsey (Alder). 



C. OVata (?) Guernsey, dredged (Jeffreys and Norman). 



Forbesella tessellata {Forbes). Guernsey, dredged off Castle Cornet 

 (Alder). Lihou, Bordeaux, Alderney (Sharp). The body is depressed; 

 test firm and modified to form plates. Colour yellow marked with pur- 

 plish spots. 



F. limaeina {Forbes). Guernsey (Ansted). Lihou (Sharp). Body much 

 depressed, with orange coloured, coriaceous test. It is marked with dark 

 spots enclosing small warts. Professor Herdman remarks " The Cynthia 

 limaeina of Forbes is either the same species or very closely related to it, 

 and probably therefore comes also into this genus." 



