64 



CHAS. L. WALTON AND OLWEN M. REES. 



We have compared these Plymouth examples with preserved speci- 

 mens of E. claparedi obtained from the Naples Marine Biological Station, 

 and find both external and internal characters in agreement. The 

 following is a short description of the external characters of one of the 

 best of the Italian specimens : 



Length (somewhat contracted) 45 mm., greatest diameter 5 mm. 

 Physa small, being slightly contracted, about 1-5 mm. in length. Scapus 



z^ , 



'^--t-- 



Fk;. 2. — Edivardsia clapurcdi. Part of transverse section througli the scapus regie 

 showing tubercles, body wall, ami mesentery (slightly diagrammatic). Index to lettering : 

 cu, cuticle; ec, ectoderm; e«, endoderm ; m, mesogloea ; m.f., mesenterial filament; 

 /", foreign incrustations on the body-wall ; sp., space at summit of tubercle ; p.m., pariet a 

 muscle ; r.m., longitudinal retractor muscle ; tu, tubercle ; z, zooxanthellae. 



cylindrical, tapering at either extremity, coated by a wrinkled, orange- 

 coloured epidermis, and beset with eight longitudinal rows of whitish 

 warts, devoid of covering at their summits ; they are set more closely 



