Catty Marine Lahoratory, St. Aiidreio.f. 17 



i. On the Chictoptrridip, Anipliictcnidic, and Ainplirirctidio 

 drviUji'd in the Gulf of !St, Lawrence, Canada, bij 

 Dr. ir/iiieaves in 1871-73. 



The Cliajtoptciids arc represented only l)y frap:m('nt.s of a 

 Sj/ioc/iiofojifrrns, prohahly .S. /t/jiiciis, Sars, I'roni No. 9, ]S7.'5. 



Tlic A ni|)lii('t(Miiil;c include Ciatenidcs hyperhurea, Malinfjien, 

 dredjrcd in l()l)-;212 fathoms oil' Antico^ti in 1871 and more 

 abundantly on Orplian Hank, Nos. 9 and 1(5, 1873. This 

 form is distinfi;nislied by the dark colour of the paleohe 

 and their number — viz. twelve to fourteen, thou;;h oeeasion- 

 aliy lifteen may be jjrcseut, — by their gi-eatcr breadth than in 

 Liiyis, and thoJigh the tijjs arc finely tapered they arc more 

 rijiid than those of Layis koreni, by the peculiarly blunt, 

 almost knob-like, condition of the fringes of the veil, and by 

 the iirescneo of seventeen pairs of bristle-bundles. One of 

 the most cliaracteristic features anteriorly is the oral veil, 

 whieh, instead of ceasing laterally in a line with the anterior 

 cirrus, passes downward and backward as a broad sheath, 

 Mhich envelops most of the oral tentacles like a broad funnel, 

 as in Cistcnides yranulata, a form characteristic of the waters 

 of Greenland. This has similar pajjilloe on the margin of the 

 veil, but only nine or ten paleolae in its crown. The anterior 

 and j)osterior bristles closely resemble those of Layis koreni, 

 though, on the whole, the stronger anterior (simple) bristles 

 have broader shafts in the latter. The caudal hooks of the 

 Canadian species are less tapered at the neck, the curve 

 of the terminal hook less marked, and the point in the 

 British form is also often sharper. One of the most 

 distinctive features, however, is the structure of the minute 

 hooks (PI. II. fig. 7) on the lamelhc of the feet, which, 

 instead of having six teeth in a continuous row above the 

 minute series of four inferiorly, have but three in increasing 

 size. The process beneath the third usually has three teeth 

 at tlie tip, as shown l)y Malmgrcn, but sometimes four occur, 

 and occasionally only two — apparently from injury. The 

 groove below this jjroeess is figured by ^laluigrcn as bluntly 

 and smoothly rouniled, but it really shows from above down- 

 ward a convexity ar.d then a concavity, with a small hook- 

 like tip. The shaft diminisiies even more rapidly than in 

 Layis koreni. The anal process has three or four lobes on 

 its dorsal margin behind the hooks, and thus diliers from 

 that of Layi.s koreni, w Iiieh has a papilla on the tip of these 

 j)rocesses. 



Stalked Infusoria occur in numbers on the palcolie. 



