Gatty Marine Laboratory ^ St. Andrews. 



1^9 



2. On Nevaya* wliiteavesi, a Form with certain Relatio)isJiips 

 to Sclerocheilus^ Grube, from Canada. 



Dredged at Station 5.2, Gulf of St. Lawrence^ Canada, 

 1873, by Dr. Whiteaves. 



A fragment of the anterior region of a form (PL V. fig. 1) 

 uith a somewhat broad flattened body, a little tapered toward 

 the front and rapidly narrowing behind the broad anterior 

 region. The feet are deeply cut and have conspicuous 

 bristles. Moreover, the second bristled segment has specially 

 modified powerful golden bristles. 



The head has anteriorly a somewhat slender prow (PL V. 

 fig. la), slightly blunt at the tip. From this a prominent 

 and rather narrow median ridge (flattened vertically) passes, 

 backward to terminate in a small tentacle at the second 

 bristled segment. The central region of the snout, indeed,, 

 is somewhat spindle-shaped when viewed from the dorsum, 

 as a dilatation occurs in the middle, followed by the vertically 

 flattened posterior portion. This condition recalls that in 

 Nerine, especially as the lanceolate lateral processes resemble 

 the branchiee of that form. Part of the proboscis is extruded 

 as a frilled organ. On each side of the median ridge ante- 

 riorly is an acutely lanceolate lamella (which may be bran- 

 chial in function) pointing backward and outward, whilst 

 from its inner border a tuft of slender glistening bristles 

 (PL V. fig. 1 d) is directed upward, thus forming a remark- 

 able arrangement in this region, and probably representing 

 the dorsal division of the first pair of feet. Below is a small 

 conical lamella, followed ventrally by a second of similar 

 shape, a tuft of bristles projecting downward, outward, and 

 forward in front and glistening with a brilliant metallic 

 sheen. The ventral edge of this foot forms a long rounded 

 elevation directed obliquely outward and forward from the 

 median line and apparently clasping the buccal region. The 

 ventral division carries a series of rather stout curved bristles 

 (PL V. fig. 1 b), with a hook at the tip directed backward, 

 but considerable differences exist amongst them, some being 

 longer and more slender. At the posterior part of the 

 cephalic median ridge another narrow lanceolate lamella 

 projects on each side, the base being somewhat broader than 

 that in front. In the preparation it slopes obliquely back- 

 ward and outward. The arrangement of these lamellae 

 therefore recalls the condition in Spiopbanes. Their relation- 

 ship to the feet may not be quite free from doubt. The next 



* Named after Xevay Park, on the Sidlaws, Forfarshire, 



