Gallu Marine Lahoralory, St. Andrew'*. 27 



of five (Clapari'de) and similar in general appearance. 

 They are ciliated internally and have palpocils externally. 

 Tlic first ventral branchia is reduced to a simple filament 

 without pinnie. A single vessel occurs in each filament, 

 and it ends blindly where the cilia cease. 



The bodi/ of the examples from Sark is not larger than 

 tliat of Amphicora fabricia from St. Andrews — the advantage 

 in size, indeed, being with the northern form, which is also 

 more translucent. The eyes had disap|)eared in the pre- 

 l)arutions (after preservation for 42 yearsj, and yet, as 

 Claparede shows, those of A. fabricia are permanent iu 

 sjjirit. The number of segments is at once diagnostic, for 

 Oria an/iandi has fourteen bristled segments besides the 

 first and last. Claparede, however, gives nineteen or twenty 

 segments, though he found a ripe female with fewer thau 

 twelve segments. The first segment is achetous. At the 

 tenth segaient the bristles change to the ventral border and 

 the shape differs. 



The digestive system has a cylindrical colourless oesophagus, 

 and from the third segment the gastro-intcstiual canal 

 proceeds backward as a brownish wide tube. A blood-vessil 

 runs on each si<le of the canal with a transverse branch iu 

 each segment — indeed, the gut is surrounded by a vascular 

 rete {Claparede). In the seventh segment a pair of folded 

 tubular organs (segmental ?) occur. 



Fourteen pairs of bristle-bundles characterize those from 

 Sark. The anterior bristles have stouter shafts than those 

 of Amphicora fabricia, and the tapering tip is shorter and 

 has wider wings. Eight pairs belong to the anterior and 

 six to the posterior region, the latter being distinguished by 

 their slenderness and the tenuity of their hair-like tip, as 

 well as by the absence of wings. Moreover, they are 

 generally directed forward with a slight curvature, whilst 

 the anterior bristles are directed backward. The anterior 

 hooks have a similar shape to those of Amphicora fabricia — 

 that is, have a curved shaft which tapers interiorly, a 

 shoulder above which is a somewhat narrower neck 

 surmounted by a strong sharp main fang, which comes ott" at 

 less thau a right angle to the throat and with two or three 

 strong teeth above it, the crown being, on the whole, more 

 elevated than in A. fabricia. The neck of the hook is also 

 sbghtly bent backward. The posterior hooks, whicli, as in 

 Amphicora fabricia, occur in the last three bristled segments, 

 diller, as Claparede observed, from those of the species jtist 

 mentioned in their shorter form, for the basal region is 

 truncated and the posterior outline short and concave, the 



