84 EDITH M. PRATT, B.SC. 



Molgula gregaria Lesson = Cynthia gregaria, Cent. Zoolog.. 

 p. 157; Challenger, Vol. VI., Tuhicdtd, p. 73. Habitat: 

 Limited to Strait of Magellan and the Falkland Islands. It 

 appears to have been found only in shallow water. 

 The genus appears to be almost universally distributed over the 

 temperate portion of the southern hemisphere. 



Comparison of the common shore fauna of the Falkland Islands ivith that 



of Britain. 



It is interesting to note that there is a certain resemblance between 

 these two faunas, but it is more clearly marked in some groups than in 

 others. This may be due, to a certain extent, to the great or small 

 number of species of the groups represented in the collection. 



Of the 16 species of Bryozoa represented, 6 (of which two are cosmo- 

 politan) are also found on our shores. 



Of species belonging to other groups, one (Sycon ciliatum) is British. 



All the genera (13) of Bryozoa in the collection are represented in 

 the British fauna ; of these, 8 are cosmopolitan, the remainder ai*e 

 found only in temperate and tropical waters. 



Of the 22 genera belonging to other groups, 15 are British, 2 are 

 restricted to the southern hemisphere, 4 are found in the southern 

 hemisphere, tropics, and northern hemisphere (Japan) ; the distribution 

 of one ( Edotia) is doubtful. 



Of the 24 species, exclusive of the Bryozoa, occurring in this collec- 

 tion, 19 have been found in the southern hemisphere only; of these, 7 

 ara more or less uniformly distributed over the temperate portion, 

 and 12 (three of which are peculiar to the Falkland Islands) have been 

 recorded from and about the southern portion of South America. 

 Three have been recorded from north and south temperate regions 

 only ; one from north and south temperate regions and the tropics ; 

 one from tropics and southern hemisphere only. 



The evidence gained from a study of the distribution ,of the common 

 shore fauna of the Falkland Islands, points to a near and close relation- 

 ship, among the majority of forms, between the faunas of the tem- 

 perate portions of the three great continents, including the islands in 

 temperate latitudes of the southern hemisphere. 



