PEOF. W. A. HERDMAN ON BEITISH TUNICATA. 453 



Obs. — The remaiuing Cynthiidae and tlie Molgulidae, as well as 

 a few Ascidiidse, must be left over for a further iastalment of 

 these " Notes." Perhaps it ought to be stated that the coloured 

 drawings of the species, which were exhibited when this paper 

 was read, are reserved for my detailed mouograph of the entire 

 group which is now in progress. 



Note. — Since this paper was in type I have received, thanks 

 to the courtesy of the authors, a copy of the beautiful Mono- 

 graph by MM. Lacaze-Duthiers and Yves Delage, entitled 

 " Eauue de Cynthiadees de Eoscoff " (Mem. Acad. Sci. Inst. 

 Prance, t. xlv. no. 1), in which, amongst other forms, the 

 following Cynthiidae dealt with in the present paper are discussed, 

 \iz. Forhesella tessellata, Styela ricstica, and Polycarpa glomerata. 

 I must defer till some future opportunity a detailed examination 

 of their results, and will now merely express my impression that 

 what they describe as rustica and refer to the genus Polycarpa 

 is not the northern and true Styela rustica (cf. antea, p. 448). 



EXPLANATION OF THE PLATES. 

 Plate XXXIIL 

 Fig. 1. Group of five individuals of Ciona fascicularis, Hnk. 



2. A single solitary individual. 



3. Base of clump of two individuals, showing the interlocking villosities. 



4. Part of the branchial sac from the inside. 



5. An individual i-emoved from the test, natural size. 



6. The aliuientary canal, showing the posterior prolongation of the 



branchial sac. 



7. The alimentai-y canal, showing oesophagus and stomach. 



8. The tentacles, dorsal tubercle, and dorsal languets. 



(All from Canon Norman's type specimens.) 



Plate XXXIV. 

 Fig. 1. Large specimen of AscidieUa asj^erm, from Lamlash Bay (? Hancock's 

 Ascidia Normaiii). 



2. Abnormal specimen of AscidieUa virginea {—Ascidia sordicla, A. & H.), 



from Firth of Forth. 



3. Outline (reduced in size) of three individuals of Ascidia affinis, Hnk., 



sticking on small oyster-shell (from Canon Norman's types). 



4. Individual of Ascidia affinis, with test removed, from left side to show 



enormous intestine. 



5. Dorsal tubercle and tentacles of Ascidia affinis. 



6. Dorsal tubercle from another individual. 



7. Outline of specimen of Ascidia crassa, Hnk. 



8. Dorsal tubercle of Ascidia crassa. 



9. Part of branchial sac of same. 



10. Individual of Ascidia crassa with test removed. 



(Figs. 3 to 10 are from Canon Norman's type specioiens.) 



