STRUCTURE AND DEVELOPMENT OP LOXOSOMA. 
261 
On the Structure and Development of 
Loxosoma. 
By 
Sidney F. Harmer, B.A., B.Sc.. 
King’s College, Cambridge, Demonstrator of Comparative Anatomy 
in the University. 
With Plates XIX, XX, XXI. 
The investigations which form the subject of the present 
paper were carried on during an occupation of the Cambridge 
University Table at Naples from January to July, 1884. An 
account of my main results was communicated to the Montreal 
meeting of the British Association in September, 1884, and a 
short abstract will appear in the forthcoming report. 
Pakt. 1. — Species of Loxosoma found at Naples. 
The specific characters of this genus have been found some- 
what difficult to establish satisfactorily, and considerable doubt 
has on various occasions been thrown on the validity of many 
of the characters ascribed to the different species. Although 
the number of the tentacles and of the buds is not so constant 
as Schmidt (20) has supposed, the majority of the species which 
have been described are no doubt perfectly distinct from one 
another. 
The following have come under my own observation at 
Naples : 
1. L.Tethyse, Salensky . — Number of tentacles in most cases 
twelve, but in many individuals thirteen or fourteen. Buds not 
