14 BRITISH TUN1CATA. 



should not illustrate his own works and that the figures 

 should not he larger than life. A natural-history 

 draughtsman's work will he complete in proportion to 

 his knowledge of his subject, and who can be so well 

 acquainted with his subject as the naturalist who has 

 determined the species ? An object ought to be drawn 

 of such size as is necessary for the accurate rendering 



it 



of form and character. In. minute and complicated 

 objects this can only be done by enlarging the repre- 

 sentation. So far as we are able to ascertain not a 

 single new Tunicate has been added to the British fauna 

 by Sir John Dalyell's labours. 



The ' History of British Mollusca ' by Forbes and 

 Hanley [in 4 volumes] bears the date of 1853, though 

 its publication commenced in 1847.* Seventy-three 

 species are described in this work, [sixty in the first 

 volume,] seven of which were entirely new to science, 

 namely Leptoclinum punctatum, Molgida oculata, Cynthia 

 quadrangularis, C. infoi'iut*, 0. tes^Uatn, C. limacina, 

 and G. morns ; and thirteen were for the first time 

 recorded as British [,namely Polyclinum aurantinm, 

 Amouroucium Nordmanni, A. argus, Botryllus violaceus, 

 B. smaragdus, Botrylloides rubrum, Ascidia arachnoidea 

 ( = ^4. mamillata), A. ritrea, Molgula tubulosa, Cynthia 

 microcosmiis, C. grossularia, C. ampulla, and G. nggre- 

 gat<i~\. In this work, also, there is found the first 

 record of a well-authenticated Snlpa in our seas, 8. 

 runcinata. Dr. Macculloch was the first to notice the 

 presence of this interesting genus in the British seas, 

 but his description and figure are not sufficient for the 

 determination of the species. 



There is something more than a mere record of 

 species in the ' British Mollusca ' ; it contains an excel- 

 lent resume of the then state of knowledge of this 



! Pp. 1-477 of the first volume came out in twelve monthly parts, dated 

 1848, but the first part, for Jantiary, pp. 1-40, in which are nearly all the 

 Tunicata, may have been issued before the end of the year 1847. Alder and 

 Hancock's date is therefore allowed to remain here, but in the synonymy 

 the date given for the first part is that which appeared on its cover, 1848. 



