•22 Trof. M'lntosh's Notrs /mm the 



luul with acute tijis. At tlic fiftieth foot a notcli separates 

 tlie two divisions, and the modilicMl ventral liristles liave 

 a sharp and sliglitly hooked point minutely dotted under a 

 liifxh |)ower. 



This is a frafrmcntary form, yet wiih such definite charac- 

 ters as to render its identification easy. 



The first foot carries a subulate l)iaue]iia and a larjre 

 lanceolate la > ella. The ventral division also lias a lanceo- 

 late process, and the bristles in both are lon^ and slender. 

 From the shape of the bodv the lamelhv and bristles occupy 

 tlie dorso-hiteral ed^e, so that the branchifo, which readily 

 fall oft", pass transversely inward over the flattened dorsum. 

 At the tenth foot the ventral lamella forms a broad, almost 

 semicircular flap, with a tendency to a peak inferiorly. The 

 ventral series of shorter broader bristles overlap the finely 

 tapered forms stretcliin^^ outward alon^ the lamella. 



Tlie branchiix remain subulate at the twenty-fifth foot, and 

 stretch beyond the elongated upper lamella, ■which is acutely 

 lanceolate superiorly, its outer edge being comparatively 

 even till it curves inward inferiorly. The ventral lamella 

 forms a blunt flap with the bristles in the grou])s just men- 

 tioned. At the fiftieth foot the branchia is still rather long 

 and siibulatc, and the upper lamella is prominent and 

 rounded inferiorly, whilst superiorly it is acutely lanceolate. 

 The upper bristles of the dorsal series arc long, slender, and 

 finely tapered. A notch separates the two divisions of the 

 foot. The ventral lamella is also prominent and rounded, 

 generally with a short peak. The modified bristles ventrally 

 show a sharp and slightly hooked point, minutely dotted 

 utidcr a high power. No wings are visible in either dorsal 

 or ventral bristles. 



A'ncw British species is Aoiiides pnnci/iranc/iinta, Southern*, 

 irom Clew l?ay and Berehaven. The snout is acute, though 

 less abruptly so than in A. oxijcephala, and it is prolonged 

 backward to end in a peak. Four eyes occur posteriori}', 

 tlie anterior pair having a larger space between them. The 

 hody, though much smaller, lias a similar form to that of 

 A. oxycei'hnla, and it l)ears about ten gills anteriorly, 

 the branchial region being thus different from that of the 

 common form, in which the gills ap{)ear to be closer in 

 the preparations, though that may be caused by the methods 

 adopted in preservation. In the seventy-eighth foot the 

 dorsal division contains four hooks and six capillary setae. 



♦ True. R. I. Acad. vol. xxxi. Nu. 47, p. 100, })1. xi. fii?. 24 a-e. 



